Car lights are one of the key components to ensure nighttime driving safety. They not only improve the driver’s field of vision, but also allow other drivers to spot the vehicle in time and avoid accidents. Therefore, keeping the lights in good condition is essential for safe driving. This article will provide some practical tips for car light maintenance to help car owners maintain the best performance of the lights.This shows that, led warning lights It has a strong development pulse and is an indispensable source of power for the development of the industry. https://www.lkx-mascarello.com

　　. Types and functions of lights

　　Modern cars are equipped with a variety of lights, including headlights (low beam and high beam), fog lights, turn signals, brake lights, reversing lights, etc. Each light has its own unique function and usage scenario:

　　- Headlights: Provide the main lighting at night or in low visibility environments.

　　- Fog lights: Used in fog or other low visibility conditions to help drivers see the front and the road better.

　　- Turn signals: Indicate the vehicle’s turning intention to other traffic participants.

　　- Brake lights: Light up when braking, warning the vehicle behind to slow down or stop.

　　- Reversing lights: Light up when reversing, providing lighting and warning others that the vehicle is moving backwards.

　　Car Light Maintenance Guide

　　. Importance of car light maintenance

　　Good vehicle lights are not only related to driving safety, but also help vehicles pass annual inspections and avoid traffic violation fines. Car light maintenance should include regular inspection, cleaning and replacement:

　　1. Regular inspection: Check the function of all car lights at least once a month to ensure that they can turn on and off normally and the light is bright and focused.

　　2. Clean the car lights: The lampshades and reflectors of the car lights often accumulate dust and dirt, which will affect the brightness and range of the light. Clean the car lights regularly with a soft cloth and appropriate detergent.

　　3. Replace the bulbs in time: When you find that the brightness of the bulb has decreased or it is damaged, you should replace it immediately. It is recommended to use the bulbs recommended by the vehicle manufacturer to ensure the best performance and compatibility.

　　. Maintenance tips and steps

　　Check and replace the bulb

　　1. Turn off the engine: Make sure to turn off the engine and remove the key before checking or replacing the bulb.

　　2. Access the bulb: Open the lampshade or lamp group according to the instructions in the vehicle manual.

　　3. Check the bulb and wiring: Check if the bulb is damaged. If there are cracks, black spots or burn marks, replace the bulb with a new one. At the same time, check if the wiring is firm and corrosion-free.

　　4. Replace the bulb: Remove the old bulb and avoid touching the glass part of the bulb directly with your hands when installing the new bulb, because the grease on your hands may affect the service life of the bulb.

　　It is usually made of copper and has the following characteristics:If you want to make a big difference in the market, 304 stainless steel screws It is necessary to intensify the upgrading of products on the original basis in order to meet the consumption needs of consumers. https://shwhardware.com

　　Easy installation: By heating the nut to blend with the base material, the installation process is simple and fast.

　　Strong connection: After hot melting, it can form a strong connection with the base material, with high pulling force and torque.

　　No need for tapping: The nut already has threads inside, so there is no need to tap on the base material, saving processing time and cost.

　　Beautiful and neat: The nut is flush with the surface of the base material, and the appearance is beautiful and neat.

　　When selecting a hot melt nut, factors such as the size, material, and thread specifications of the nut need to be considered to ensure its compatibility with the base material and connection strength. At the same time, attention should also be paid to the parameters of the hot melt process, such as heating temperature, heating time, and pressure, to ensure the installation quality of the nut.

　　I believe that all my friends have more or less experience in sending express delivery. After our express delivery arrives at the site, it will be inspected by the express security inspection machine. So how does the express security inspection machine detect contraband?As it happens, many people are killed walk through metal detector And bring more benefits, make it flourish, and promote the industry greatly. https://secuzoan.com/

　　security scanners

　　1. Recognition of X-ray images of gun express security inspection machines:

　　Under the camera, metals are all dark blue and red, and most guns are made of steel, so a clear outline of the gun body is shown on the express security inspection machine camera. Simulation guns are mostly made of aluminum alloy, the metal density is not as high as that of real guns, and the structure of the barrel is also different from that of real guns. There is a plug in the barrel of the simulation gun, so the X-ray image of the express security inspection machine is not completely dark blue and red, only some blue and red on a single edge of the gun. As for toy pistols and plastic guns, they appear green or orange on the express security inspection machine camera. In this way, real guns, simulation guns and toy guns can be distinguished from the color and structure of the X-ray image of the express security inspection machine.

　　2. Identification of X-ray images of controlled tool express security inspection machines:

　　Controlled knives include daggers, switchblade knives, self-locking knives, and minority technical sabers. When the knife is not clamped and hidden, it has a significant shape and outline on the express security inspection machine camera, and its color is mostly dark blue and green.

　　security scanners

　　3. X-ray image recognition of explosives express security inspection machine:

　　Explosives are mainly composed of explosives and fuse bodies. Explosives are mostly organic matter. The X-ray system of the express security inspection machine gives organic matter an orange-yellow color. Depending on the type, density and quantity of the explosives, the orange-yellow color may vary from light to dark. Some explosives have specific shapes and structures, such as block TNT, hardcover ammonium nitrate explosives, etc., which are relatively easy to find.

　　4. X-ray image recognition of drug delivery security inspection machine:

　　Heroin is in powder form, or compressed into regular blocks, and appears as a unique orange color on the camera of the X-ray system of the express delivery security inspection machine.

　　As the pressure of life continues to increase, more and more people are beginning to pay attention to sleep problems. Well-known sleep experts, including Wang Gongquan, Zhang Jing, etc., recommend memory pillows (slow rebound pillows) to improve the quality of sleep. But many people still don’t understand why memory pillows have such effects, and how these pillows are designed and manufactured? In this article, we will introduce the principle and manufacturing process of memory pillows in detail, and discuss whether it really works.Before that, travel pillow memory foam The market has also soared for a time, which has attracted the attention of a wide range of investors. https://tainengjikang.com/

　　Are memory pillows (slow rebound pillows) really effective? What is the principle?

　　1. The principle of memory pillow

　　Memory pillow, also known as slow rebound pillow, is made of a highly elastic foam material that can appropriately disperse the load according to the weight and heat of the human head, and can also make adaptive adjustments to the curve of the head. When you press your head on the pillow, it will sense the contour of your head and gradually adapt to the shape of your head. When you leave the pillow, the pillow slowly rebounds to its original shape to improve comfort and support. Memory pillows usually consist of three parts: outer cover or pillowcase, liner or filler and memory foam.

　　Are memory pillows (slow rebound pillows) really effective? What is the principle?

　　2. Manufacturing process of memory pillow

　　1. Raw material preparation: The main raw material required for the production of memory pillow is polyurethane foam material, and other ingredients are also required, such as catalysts, detergents, stabilizers, etc.

　　2. Foaming: Foaming is a key step in the manufacture of memory pillows. After the raw materials are mixed at a certain temperature, they are pumped into the mold for foaming. During foaming, multiple parameters such as temperature, pressure, and time are strictly controlled. When the foam is formed, it needs to be processed with an oven or other equipment to ensure that the foam has a smooth surface and is not sticky.

　　3. Cutting: After the foaming is completed, the industry personnel use automated equipment to cut the foam into memory pillow blocks of various sizes and shapes. During this process, the size of each block needs to be carefully controlled to ensure that they meet the design requirements.

　　4. Packaging: Finally, the manufacturer puts the memory pillow blocks into the corresponding covers, usually fiber nylon or ribbed cloth covers, to make a whole.

　　Are memory pillows (slow rebound pillows) really effective? What is the principle?

　　3. Advantages and Disadvantages of Memory Pillows

　　Advantages:

　　a. More comfortable: Memory pillows have good adaptability to the human body, so they can disperse the pressure between the head and neck, making sleep more comfortable.

　　b. Better support: The memory pillow material has high elasticity, which means it can provide excellent support performance and maintain its shape during long-term use.

　　c. Reduce respiratory and allergy problems: Memory pillows usually have antibacterial and anti-allergic properties, which can reduce respiratory problems caused by sleep.

　　As a profitable commercial place, the ultimate goal of hotels and guesthouses is to make money. Therefore, they also pay great attention to the quality of service and give guests a high-end enjoyment. Whether taking a hot shower or taking a bath in a bath center, guests can enjoy the best hot water experience. To meet this requirement, the hot water supply equipment must have the ability to provide hot water all day long and maintain a good temperature, and there must be no uneven hot and cold water. Air source heat pumps, solar water heaters, electric water heaters, gas water heaters, coal-fired boilers, these are the most commonly used hot water equipment, but air energy water heaters are comfortable, safe, energy-saving, and environmentally friendly. It is the best hot water equipment for hotels. Let’s talk about why people prefer air energy heat pumps?It is reported that, heat pumps for sale The data performance is getting better and better, which is of great reference value and is likely to become the vane of the industry. http://mangoenergyheatpump.com

　　1. Stability

　　If customers cannot even meet the basic hot water supply when staying in hotels, it will directly affect the stay experience and secondary occupancy rate. In the face of peak tourist seasons or extreme climates, traditional electricity, gas, solar energy and other equipment often have various problems, such as hot water supply and demand, freezing and shutdown of units, etc. Air-energy heat pumps effectively avoid the above problems. They are equipped with a dedicated heat pump compressor developed with high-end technology and built-in electronic chips, which can achieve sufficient hot water supply, and are not afraid of severe cold, and can also operate stably in extreme low-temperature weather.

　　2. Comfort

　　Nowadays, people pay attention to the quality of life, and high-end hotels pay more attention to the stay experience. However, if the hotel room cannot wait for hot water for half a day, or the hot water is extremely unstable, and it is hot and cold, it will undoubtedly affect the user experience. At present, the air-energy heat pump equipment on the market is developed using international advanced technology, which greatly improves the heating capacity of the unit in various environments, realizes instant heating, and hot water constant temperature guarantee, meeting the needs of most population residential areas in the country.

　　In today’s technologically advanced world, PIR (Passive Infrared) motion sensors have become a cornerstone for enhancing security and automation. Their versatility allows them to be used in various settings, but one of their most critical applications is in outdoor environments. Effectively utilizing PIR motion sensors outdoors can significantly boost security, energy efficiency, and convenience. Here¨s how to harness the full potential of these devices.Mentioned in the article motion detector sensor Born with strong vitality, you can turn a cocoon into a butterfly and become the best yourself after wind and rain. https://www.sunlit-tech.com

　　PIR motion sensors work by detecting changes in infrared radiation within their field of view. This makes them ideal for outdoor environments where detecting movement or changes in heat patterns can be crucial. These sensors, often referred to as PIR detectors, are designed to identify the heat emitted by moving objects, such as people or animals, which makes them highly effective in surveillance and security systems.When installing PIR motion sensors outdoors, the key is to understand their operating principles and optimize their placement. Unlike indoor environments, outdoor spaces can present challenges such as varying temperatures, weather conditions, and potential obstructions. To maximize the effectiveness of your motion detector sensors, it¨s essential to consider these factors carefully.

　　First and foremost, the placement of PIR motion sensors is crucial. Positioning them at strategic locations can help cover larger areas and ensure comprehensive monitoring. Common placements include near entryways, driveways, and garden paths. It¨s important to avoid placing sensors directly in the path of sunlight, as extreme heat can interfere with their ability to detect motion accurately. Additionally, ensure that the sensors are installed at a height that allows them to effectively cover the desired area without being obstructed by foliage or other objects.

　　Adjusting the sensitivity of your PIR motion sensors can also enhance their performance in outdoor settings. Many models come with adjustable sensitivity settings, which can be fine-tuned based on the specific needs of the environment. For instance, you might want to set a higher sensitivity level for areas with frequent foot traffic or lower sensitivity for locations with less activity. Proper calibration ensures that the sensor responds accurately to real threats while minimizing false alarms.Incorporating motion sensor alarms into your outdoor setup can add an extra layer of security. These alarms are activated when the PIR motion sensors detect unusual movement, providing immediate alerts and deterrence against potential intruders. Integrating these alarms with a broader security system can further enhance their effectiveness. For example, pairing PIR motion sensors with video surveillance cameras can provide a comprehensive security solution that not only detects but also records suspicious activities.Another important consideration is the power source for outdoor PIR motion sensors. Many models are designed to be weather-resistant and can operate on battery power or be hardwired into an electrical system. Battery-operated sensors offer flexibility in placement but may require periodic maintenance to ensure they remain operational. On the other hand, hardwired systems provide a more permanent solution but require more extensive installation.

　　Weatherproofing is essential for outdoor PIR motion sensors to ensure their longevity and consistent performance. Choose sensors specifically designed to withstand various weather conditions, including rain, snow, and extreme temperatures. Proper installation with sealed enclosures can help protect the sensors from environmental factors that could otherwise impact their functionality.Regular maintenance is also key to keeping your PIR motion sensors in top working condition. Periodically check the sensors for any obstructions, dirt, or debris that may affect their performance. Cleaning the sensors and ensuring that they are free from obstructions will help maintain their sensitivity and accuracy.

　　In summary, effectively using PIR motion sensors in outdoor environments involves careful planning and consideration of various factors. By strategically placing sensors, adjusting their sensitivity, integrating motion sensor alarms, and ensuring proper weatherproofing and maintenance, you can maximize their benefits. These steps not only enhance security but also contribute to a more efficient and automated outdoor space. Embracing these practices will help you make the most of your PIR motion sensors and ensure they serve their purpose effectively.

모모In the realm of precision manufacturing and moulding, there are a multitude of components that play crucial roles in the production process. Among these, mold core pins are unsung heroes that contribute significantly to the accuracy and functionality of the final product. But what exactly are mold core pins, and why are they so important? Let몶s embark on a journey to uncover the role of these indispensable tools in the world of moulding.In the eyes of peers, moulded plastic parts It has good qualities that people covet, and it also has many loyal fans that people envy. https://www.dghrjmmj.com

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모모뮃 Mold Core Pins Unveiled: The Basics

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모모At their core, mold core pins are specialized components used in the moulding process to create internal features and cavities within a moulded part. Think of them as the sculptors of the moulding world C they shape and define the internal structures of the product, ensuring that every detail is precisely formed. Typically made from high-strength steel or other durable materials, these pins are designed to withstand the rigours of high-pressure injection moulding.

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모모뮄 The Multifaceted Functions of Mold Core Pins

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모모Creating Internal Cavities:One of the primary functions of mold core pins is to create internal voids or cavities within the moulded part. This is essential for products that require hollow sections, complex internal geometries, or specific voids. For instance, in automotive components or consumer electronics, internal cavities might be necessary for functional or aesthetic purposes.

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모모Shaping and Detailing:Mold core pins are instrumental in shaping intricate details within the product. They allow for the formation of fine features such as channels, slots, and contours that would otherwise be difficult to achieve. This level of detail is crucial for parts that require precise fitting or functionality, such as connectors or medical devices.

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모모Facilitating Part Removal:Core pins also play a role in ensuring that the moulded part can be easily ejected from the mould. By providing a precise and controlled structure, core pins help in minimizing the likelihood of the part sticking or getting damaged during removal. This is particularly important in high-volume production where efficiency and part integrity are paramount.

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모모Supporting Mould Alignment:Proper alignment of the mould halves is critical for achieving accurate and consistent moulding results. Mold core pins assist in maintaining the alignment between the core and cavity sections of the mould, ensuring that the internal features are correctly positioned and that the overall part quality is upheld.

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모모Enhancing Production Efficiency:By contributing to the precision and reliability of the moulding process, core pins enhance overall production efficiency. Accurate core pins reduce the need for post-processing or adjustments, thereby streamlining the manufacturing workflow and reducing production time and costs.

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모모뮅 Material Matters: The Composition of Core Pins

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모모Mold core pins are typically made from materials that offer exceptional strength and durability. High-carbon steel, stainless steel, and hardened tool steels are common choices due to their ability to withstand the high pressures and temperatures encountered during injection moulding. The choice of material can impact the longevity and performance of the core pins, making it crucial to select the right type for the specific application.

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모모뮆 Customization and Design Considerations

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모모Core pins size are not one-size-fits-all. They can be custom-designed to meet specific moulding requirements and product specifications. Factors such as size, shape, and the complexity of the internal features influence the design of core pins. Customization ensures that the core pins meet the exact needs of the moulding process and contribute to the production of high-quality parts.

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모모In Summary밐

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모모Mold core pins are vital components that play a pivotal role in the moulding process. Their functions C from creating internal cavities and shaping details to facilitating part removal and supporting mould alignment C underscore their importance in producing precise and high-quality moulded parts. Understanding the role and significance of core pins not only highlights their contribution to manufacturing but also emphasizes the importance of selecting and maintaining these components to achieve optimal results.

　　Car warning lights, also known as emergency vehicle lights, play a critical role in vehicle safety by alerting drivers to potential issues and hazards. When these lights malfunction, it can lead to confusion, delayed responses to emergencies, and even accidents. Understanding the common malfunctions of car warning lights and how to address them is essential for maintaining vehicle safety and reliability.contemporaneity led emergency warning lights Our competitors have not made large-scale improvements, so we should get ahead of everyone in the project. https://www.lkx-mascarello.com

　　One of the most frequent issues with emergency vehicle lights is a burned-out bulb. Over time, the filaments in incandescent bulbs can break, leading to a loss of light. This is especially problematic for emergency vehicle lighting, where reliable visibility is crucial. LED lights, although more durable, can also fail due to electronic issues or poor-quality manufacturing. Regular inspection and timely replacement of faulty bulbs or LEDs are necessary to ensure continuous operation.

　　What Are the Common Malfunctions of Car Warning Lights?

　　What Are the Common Malfunctions of Car Warning Lights?

　　Another common problem is electrical system failure. The vehicle’s electrical system powers the emergency lights, and any disruption in this system can cause the lights to malfunction. This includes issues like blown fuses, faulty wiring, or problems with the vehicle’s alternator. For instance, if a fuse blows, it can cut off the power supply to the emergency vehicle lights, rendering them inoperative. Similarly, damaged or corroded wiring can prevent electricity from reaching the lights. Routine maintenance checks, including inspecting the vehicle’s wiring and electrical components, can help prevent such issues.Faulty switches or connectors are also frequent culprits behind malfunctioning emergency vehicle lights. These components are responsible for controlling the lights and ensuring they operate correctly. If a switch becomes worn out or a connector loosens, it can result in intermittent or complete failure of the lights. For emergency vehicle lighting, reliable operation is essential, as any failure can compromise the safety of both the vehicle occupants and other road users. Regular testing and replacement of faulty switches and connectors can mitigate this risk.

　　Environmental factors can also impact the performance of vehicle emergency lights. Exposure to harsh weather conditions, such as rain, snow, or extreme temperatures, can lead to corrosion and damage to the light housings and electrical components. Water ingress, for example, can short-circuit the electrical system, causing the lights to fail. Similarly, extreme temperatures can affect the performance of both incandescent and LED lights. Ensuring that the lights are properly sealed and protected from environmental elements can help extend their lifespan and maintain their functionality.

　　What Are the Common Malfunctions of Car Warning Lights?

　　Installation errors can be another source of problems. If the emergency vehicle lights are not installed correctly, they may not function as intended. This includes improper mounting, incorrect wiring connections, or using incompatible components. Professional installation by qualified technicians can help ensure that the lights are installed correctly and function reliably.

　　One often overlooked issue is the impact of vibration and mechanical wear. Vehicles, especially those used in emergency services, experience significant vibration and mechanical stress during operation. Over time, this can cause components of the emergency lighting system to loosen or wear out. Regular inspections to check for loose connections, damaged mounts, and signs of mechanical wear can help prevent malfunctions.Lastly, user error can contribute to malfunctioning emergency vehicle lights. Incorrect operation, such as using the wrong switches or settings, can result in the lights not working as expected. Providing proper training for operators on the correct use of emergency vehicle lighting systems is essential to ensure they are used effectively and safely.

　　In conclusion, car warning lights and emergency vehicle lights can experience a range of common malfunctions, from burned-out bulbs and electrical system failures to faulty switches, environmental damage, software issues, installation errors, mechanical wear, and user error. Regular maintenance, professional installation, and proper training are crucial to ensuring these lights function reliably, thereby maintaining vehicle safety and effective emergency response. Addressing these common issues proactively can help prevent malfunctions and ensure that vehicle emergency lights perform their vital role effectively.

　　In the world of fasteners, stainless steel socket head screws stand out for their strength, durability, and resistance to corrosion. Whether you’re in manufacturing, construction, automotive, or electronics, these screws are essential. This guide will explore the benefits, applications, and considerations when purchasing wholesale stainless steel socket head screws.Industry experts have said that, stainless steel fasteners supplier It is very possible to develop and expand, which can be well seen from its previous data reports. https://shwhardware.com

　　Benefits of Stainless Steel Socket Head Screws

　　Corrosion Resistance: Stainless steel is renowned for its ability to resist rust and corrosion, making these screws ideal for environments exposed to moisture and harsh chemicals.

　　Strength and Durability: These screws offer high tensile strength, ensuring secure and long-lasting connections even in high-stress applications.

　　Versatility: Stainless steel socket head screws are available in various sizes and grades, making them suitable for a wide range of applications.

　　Aesthetic Appeal: The sleek appearance of stainless steel is often preferred in applications where the fastener will be visible, such as in furniture or architectural elements.

　　wholesale stainless steel screws

　　Common Applications

　　Manufacturing and Assembly: Used in the assembly of machinery and equipment, these screws ensure components are securely fastened, maintaining the integrity and safety of the products.

　　Construction: Ideal for structural applications, stainless steel socket head screws provide reliable fastening solutions in buildings and infrastructure projects.

　　Automotive Industry: These screws are used in various parts of vehicles, from engines to body panels, due to their ability to withstand vibrations and high temperatures.

　　Electronics: The precision and reliability of stainless steel socket head screws make them perfect for securing electronic components and enclosures.

　　Marine Applications: Given their corrosion resistance, these screws are extensively used in marine environments for boats, docks, and offshore structures.

　　Why Buy Wholesale?

　　Cost Savings: Purchasing screws in bulk reduces the cost per unit, providing significant savings for businesses.

　　Consistency: Buying wholesale ensures that you receive a consistent supply of screws, maintaining uniformity in your projects.

　　Convenience: A reliable wholesale supplier can provide a steady stream of inventory, reducing downtime and ensuring that your projects stay on schedule.

　　wholesale stainless steel screws

　　Choosing the Right Supplier

　　Quality Assurance: Ensure the supplier provides high-quality stainless steel screws that meet industry standards and specifications.

　　Reputation: Look for suppliers with a strong reputation and positive reviews from other customers in your industry.

　　Customization Options: Some projects may require custom sizes or specifications. Choose a supplier that can accommodate these needs.

　　Customer Support: Excellent customer service is crucial for addressing any issues or concerns promptly.

　　Conclusion

　　Wholesale stainless steel socket head screws are an indispensable component in numerous industries, offering unmatched strength, durability, and corrosion resistance. By understanding their benefits and applications and choosing the right supplier, you can ensure the success and reliability of your projects. Invest in quality stainless steel socket head screws today to experience their long-lasting performance and versatility.

　　”Big bags, small bags, please go through security check!” Security check is always an essential step when you travel by high-speed rail, airplane, or subway. I wonder if you have ever been interested in this security check machine. What can the staff see on the screen? How do they quickly identify the items in the suitcase? Today, let the editor reveal this secret for you.In order to open the market, baggage scanner machines Constantly improve the ability of business development and create an extraordinary brand image for it. https://secuzoan.com/

　　security check

　　How does the security inspection machine work?

　　Generally speaking, the machine that conveys and inspects luggage is called an X-ray luggage inspection machine. As the name suggests, the security inspection machine uses X-rays to inspect luggage.

　　X-rays are short-wavelength electromagnetic waves that can penetrate objects. The penetration of X-rays varies depending on the thickness, density and material of the object.

　　Everyone should know that X-rays in hospitals are also used by doctors. The penetration rate of X-rays varies according to the density of the structure and tissue. The penetration rate is high in loose areas and low in dense areas. The bones of the human body are denser than the skin and flesh tissue. Therefore, when X-rays are irradiated to the human body, the outline of the bones will be displayed more clearly on the screen.

　　security check

　　The same is true for the security inspection machine that checks luggage. The penetration rate of X-rays on different objects is different. When the suitcase passes through the security inspection machine, the X-rays penetrate the suitcase and display the outlines of different objects on the display screen.

　　At this time, some friends may feel confused: X-ray imaging should be black and white, so why can security inspectors identify different objects so quickly?

　　This question really hits the nail on the head. If you have ever looked at the security check display screen, you will find that the image on it is in color, not black and white.

　　security check

　　Normally, the color of the image formed by X-rays on the film is indeed black and white, just like the X-ray photos in the hospital. The reason why a color image appears on the security screen is that the computer calculates and converts the projection intensity of the X-rays. This is also to make it easier for security personnel to quickly distinguish different objects in a short period of time.

　　Normally, orange represents organic matter such as liquids and sprays; blue represents metals and various controlled knives; and heavy metals or lead, which can completely absorb X-rays, will be displayed in black.

　　Now you should know why the staff will immediately notice and ask you to take out a small pair of scissors in your suitcase; and the water in your backpack will also be asked to take out and drink a sip.