Explosion-proof camera is a special camera developed for the application of industrial television in the flammable and explosive field environment. At present, explosion-proof cameras have been widely used.
Explosion-proof camera guarding guarding ability
The shield of the explosion-proof camera not only withstands the damage of the external force, but also withstands the impact energy generated when the gas inside the camera burns.
Material: Explosion-proof cameras are mostly based on A3 steel (ie Q235) or stainless steel (304 or 316), and the material thickness requirement is not less than 4mm; for the processing of the flameproof surface, the screw locking hole must not be smaller than the edge of the hole. 4mm; Since plastics are easily electrostatically charged, even a polycarbonate (PC)/polymethyl methacrylate (PMMA) engineering plastic (Acrylic, Acrylic) will have a certain amount of static electricity. Therefore, in the transparent case, in order to avoid safety problems caused by the self-charged equipment, its windows need to use tempered glass, according to explosion-proof requirements, window area and thickness have strict standards. Although the development and application of high-speed domes are relatively mature, they are rarely used in the field of explosion protection. The reason is that explosion-proof shields made of engineering plastics do not meet the requirements. If high-speed balls are used in explosion-proof fields, high-speed balls can be used. The application will have a lot of room for development;
Heat dissipation: Changzhou Zoan Feng Yuzhou pointed out: "Explosion-proof products have strict requirements for self-heating in the course of their work. During the transformation process, the improvement of heat dissipation is the biggest problem. After the transformation, the product itself does not generate heat or the heat does not exceed the limit value. Otherwise it will not meet the explosion-proof requirements." The use of steel materials has played a positive role in heat dissipation, but this is not enough, but also need to achieve the overall heat dissipation of the equipment, such as in the DVR's transformation, power, hard drive heat treatment comparison Intractable, the heat of the hard disk and power supply can be conducted through the bottom plate, and then connected to the shell with aluminum: chip cooling can also use this solution. Direct connection and heat conduction between the aluminum block and the shell is not enough due to the contact tightness, which may cause poor heat dissipation. Then, the thermal grease may be used to fill the aluminum block and the outer shell so that the two are fully in contact to ensure the good effect of heat dissipation; Fans can only achieve temperature uniformity inside the device, only to play a local cooling function, can not achieve the essential heat conduction / heat dissipation purposes, so Changzhou Zoan Feng Yuzhou does not recommend the installation of additional cooling fan in the device;
Anti-corrosion: Steel shields have a certain degree of anti-corrosion ability. If more requirements are required, anti-corrosion treatment can be performed on the outer layer.
There are many types of explosion-proof cameras, and different types of transformation methods are different. Zhang Baifeng, an engineer of Shenzhen Xuan Security Equipment Co., Ltd., said: “Explosion-proof cameras have undergone rapid development from the intrinsically safe explosion-proof form to today’s mainstream explosion-proof forms. 30 years of history, explosion-proof forms include flameproof (d), increased safety (e), intrinsically safe (ia), intrinsically safe (ib), positive pressure (p), and oil filled (o) , sand-filled (q), spark-free (n), potting (m), gas-tight (h), special-type (s), dust explosion-proof (DIP), mainstream explosion-proof and explosion-proof forms The explosion-proof form has great advantages in terms of process difficulty and mass production, so currently the main explosion-proof camera in China is mainly explosion-proof, and the general type II sites (chemical plants, electrical equipment for liquefied petroleum gas stations) are completely flame-proof. Can meet the demand; only in the coal mines and other relatively high requirements of safety factor I (coal mines, downhole electrical equipment) will be applied to the combination of the explosion-proof explosion mode.
When it comes to explosion-proof cameras, it is unavoidable that several parameters such as pixels, lines, and resolution are used to measure resolution. However, many of the contractors did not understand the three parameters when they purchased explosion-proof cameras. Some people did not even know their concepts. This is understandable, because many suppliers in the provision of products to the project, because of the time, coupled with the relationship between parameters and product transactions does not have much impact, so suppliers and contractors generally only negotiate the number of pixels It does not involve the relationship between pixels, lines, and sharpness.
To a certain extent, the parameters of the explosion-proof camera's pixels, lines, and resolution are the same as the relevant parameters of computer monitors, televisions, and mobile phone displays that are commonly used by people. The three are all images of explosion-proof cameras. The description of textures is conducive to understanding the image quality of explosion-proof cameras from various angles. This is one reason why many people cannot understand the relationship between them. Then, here, Worldcraft Technology, as a professional manufacturer of explosion-proof cameras, will provide you with a detailed explanation of the relationship between the three, and provide a reference for engineering companies and people who are interested in learning.
The first is the pixels of an explosion-proof camera. It is the basic element that constitutes an image. The surveillance image of an explosion-proof camera consists of successive and rapidly appearing images, which consist of one pixel. It's equivalent to magnify an image a lot of times, then divide it from left to right and from top to bottom, it is regularly divided into many grids, fill a color in each grid, and then reduce the image to its original size. It forms an image we usually see. These grids are equivalent to pixels. The number of pixels is generally determined by the manufacturer. The more pixels, the finer and clearer the image, ie, the higher the resolution.
After knowing the pixels of the explosion-proof camera, let's talk about the clarity and the number of lines. The resolution we usually refer to includes horizontal resolution and vertical resolution. The number of image pixels can be obtained from these two indicators. We still use lattices to illustrate that an image is divided into many rows and many column grids. How many pixels are there from the left to the right in the same row of the grid? This is called horizontal definition. How many pixels are formed in the same column grid from top to bottom? It is called vertical resolution. Since each row of cells forms one pixel in the vertical direction, we can also say that "vertical resolution" is the number of "horizontal scan lines" that an image consists of. Shiguo Science and Technology Chuangxin stated that the number of horizontal scan lines in an image is determined by the signal format, so as long as the signal format is determined, the vertical resolution is determined. For PAL, the last vertical resolution you see is 625.
Further, the picture we see is not composed of all 625 lines. In fact, there are 49 lines for transmitting other information such as closed captions, texts, test signals, etc. It also takes some time when the electron beam goes from the bottom to the top to begin scanning the next image. To remove the number of rows that we "invisible", we see a picture that actually consists of a maximum of 576 lines. This is also the highest vertical resolution of the PAL system. Further, due to the imaging reasons and human visual characteristics, these 576 lines are only the theoretical resolution. The actual vertical resolution of the image you "see" must also be multiplied by a correction factor less than 1, which is called the Kell coefficient. For interlaced scanning, the Kell coefficient is 0.7, so for the PAL system, the vertical resolution of the last displayed image is about 400 lines. When actually viewing the test chart, the observed vertical resolution can usually reach about 450 lines because the Kell coefficient is not considered.
The vertical resolution is completely determined by the signal format, which is very easy to understand. Horizontal definition is the most easily confusing concept. The biggest problem is that there are multiple expressions of horizontal definition. In the field of video surveillance such as explosion-proof cameras, we are more accustomed to using the "per image height" of pixels to represent horizontal resolution, or "television lines." The origin of this habit dates back to 60 years before the television was born. At the time, because the format of the signal had determined the vertical resolution of the image, the experts' idea was to represent horizontal resolution in a manner that was related to vertical clarity. In other words, whether it is clearer in the horizontal direction or clearer in the vertical direction can be clearly seen through this relative clarity. For this reason, horizontal definition is defined as the number of pixels that can be displayed in the horizontal direction that is equal to the screen height. The definition obtained under this definition is called the "TV line", which is the so-called line number. Therefore, when you still hear how much clarity a video signal has, it doesn't mean how many pixels are from the leftmost to the rightmost edge of the image, but how many pixels are in the same horizontal width as the height of the image.
The image transmitted by the explosion-proof camera is not a boxy one. Generally, the display ratio is 4:3 or 16:9. That is, to achieve the same horizontal resolution as the vertical resolution, the pixels in the horizontal direction should reach 4/3 or 16/9 times the vertical resolution. Image sharpness = image quality of the signal source × processing level of the processing circuit × development quality of the display method. All three factors are equally important in determining the final image quality. Any difference in the links will result in a decrease in the horizontal resolution of the final image. Even if some products improve the processing circuit performance or the display performance, the image quality cannot be significantly improved without the corresponding signal source cooperation. Shiguo Technology Huanggong explained that the HD explosion-proof monitoring system requires not only a million HD explosion-proof surveillance cameras, but also the back-end processing and display of high-definition, so that performance can play better.
Similarly, as an indicator of the clarity of the explosion-proof camera monitoring picture, the three indicators of pixel, line number, and clarity may seem redundant to the contractor and the user, but for each professional manufacturer, these three indicators are: Indispensable is the measure of explosion-proof camera manufacturers tailor-made for the market. However, it is worth affirming that in the same product, any one of the three indicators will change, and the other two indicators will also change. This is why the relationship between the three is rarely paid attention.
Explosion-proof camera guarding guarding ability
The shield of the explosion-proof camera not only withstands the damage of the external force, but also withstands the impact energy generated when the gas inside the camera burns.
Material: Explosion-proof cameras are mostly based on A3 steel (ie Q235) or stainless steel (304 or 316), and the material thickness requirement is not less than 4mm; for the processing of the flameproof surface, the screw locking hole must not be smaller than the edge of the hole. 4mm; Since plastics are easily electrostatically charged, even a polycarbonate (PC)/polymethyl methacrylate (PMMA) engineering plastic (Acrylic, Acrylic) will have a certain amount of static electricity. Therefore, in the transparent case, in order to avoid safety problems caused by the self-charged equipment, its windows need to use tempered glass, according to explosion-proof requirements, window area and thickness have strict standards. Although the development and application of high-speed domes are relatively mature, they are rarely used in the field of explosion protection. The reason is that explosion-proof shields made of engineering plastics do not meet the requirements. If high-speed balls are used in explosion-proof fields, high-speed balls can be used. The application will have a lot of room for development;
Heat dissipation: Changzhou Zoan Feng Yuzhou pointed out: "Explosion-proof products have strict requirements for self-heating in the course of their work. During the transformation process, the improvement of heat dissipation is the biggest problem. After the transformation, the product itself does not generate heat or the heat does not exceed the limit value. Otherwise it will not meet the explosion-proof requirements." The use of steel materials has played a positive role in heat dissipation, but this is not enough, but also need to achieve the overall heat dissipation of the equipment, such as in the DVR's transformation, power, hard drive heat treatment comparison Intractable, the heat of the hard disk and power supply can be conducted through the bottom plate, and then connected to the shell with aluminum: chip cooling can also use this solution. Direct connection and heat conduction between the aluminum block and the shell is not enough due to the contact tightness, which may cause poor heat dissipation. Then, the thermal grease may be used to fill the aluminum block and the outer shell so that the two are fully in contact to ensure the good effect of heat dissipation; Fans can only achieve temperature uniformity inside the device, only to play a local cooling function, can not achieve the essential heat conduction / heat dissipation purposes, so Changzhou Zoan Feng Yuzhou does not recommend the installation of additional cooling fan in the device;
Anti-corrosion: Steel shields have a certain degree of anti-corrosion ability. If more requirements are required, anti-corrosion treatment can be performed on the outer layer.
There are many types of explosion-proof cameras, and different types of transformation methods are different. Zhang Baifeng, an engineer of Shenzhen Xuan Security Equipment Co., Ltd., said: “Explosion-proof cameras have undergone rapid development from the intrinsically safe explosion-proof form to today’s mainstream explosion-proof forms. 30 years of history, explosion-proof forms include flameproof (d), increased safety (e), intrinsically safe (ia), intrinsically safe (ib), positive pressure (p), and oil filled (o) , sand-filled (q), spark-free (n), potting (m), gas-tight (h), special-type (s), dust explosion-proof (DIP), mainstream explosion-proof and explosion-proof forms The explosion-proof form has great advantages in terms of process difficulty and mass production, so currently the main explosion-proof camera in China is mainly explosion-proof, and the general type II sites (chemical plants, electrical equipment for liquefied petroleum gas stations) are completely flame-proof. Can meet the demand; only in the coal mines and other relatively high requirements of safety factor I (coal mines, downhole electrical equipment) will be applied to the combination of the explosion-proof explosion mode.
When it comes to explosion-proof cameras, it is unavoidable that several parameters such as pixels, lines, and resolution are used to measure resolution. However, many of the contractors did not understand the three parameters when they purchased explosion-proof cameras. Some people did not even know their concepts. This is understandable, because many suppliers in the provision of products to the project, because of the time, coupled with the relationship between parameters and product transactions does not have much impact, so suppliers and contractors generally only negotiate the number of pixels It does not involve the relationship between pixels, lines, and sharpness.
To a certain extent, the parameters of the explosion-proof camera's pixels, lines, and resolution are the same as the relevant parameters of computer monitors, televisions, and mobile phone displays that are commonly used by people. The three are all images of explosion-proof cameras. The description of textures is conducive to understanding the image quality of explosion-proof cameras from various angles. This is one reason why many people cannot understand the relationship between them. Then, here, Worldcraft Technology, as a professional manufacturer of explosion-proof cameras, will provide you with a detailed explanation of the relationship between the three, and provide a reference for engineering companies and people who are interested in learning.
The first is the pixels of an explosion-proof camera. It is the basic element that constitutes an image. The surveillance image of an explosion-proof camera consists of successive and rapidly appearing images, which consist of one pixel. It's equivalent to magnify an image a lot of times, then divide it from left to right and from top to bottom, it is regularly divided into many grids, fill a color in each grid, and then reduce the image to its original size. It forms an image we usually see. These grids are equivalent to pixels. The number of pixels is generally determined by the manufacturer. The more pixels, the finer and clearer the image, ie, the higher the resolution.
After knowing the pixels of the explosion-proof camera, let's talk about the clarity and the number of lines. The resolution we usually refer to includes horizontal resolution and vertical resolution. The number of image pixels can be obtained from these two indicators. We still use lattices to illustrate that an image is divided into many rows and many column grids. How many pixels are there from the left to the right in the same row of the grid? This is called horizontal definition. How many pixels are formed in the same column grid from top to bottom? It is called vertical resolution. Since each row of cells forms one pixel in the vertical direction, we can also say that "vertical resolution" is the number of "horizontal scan lines" that an image consists of. Shiguo Science and Technology Chuangxin stated that the number of horizontal scan lines in an image is determined by the signal format, so as long as the signal format is determined, the vertical resolution is determined. For PAL, the last vertical resolution you see is 625.
Further, the picture we see is not composed of all 625 lines. In fact, there are 49 lines for transmitting other information such as closed captions, texts, test signals, etc. It also takes some time when the electron beam goes from the bottom to the top to begin scanning the next image. To remove the number of rows that we "invisible", we see a picture that actually consists of a maximum of 576 lines. This is also the highest vertical resolution of the PAL system. Further, due to the imaging reasons and human visual characteristics, these 576 lines are only the theoretical resolution. The actual vertical resolution of the image you "see" must also be multiplied by a correction factor less than 1, which is called the Kell coefficient. For interlaced scanning, the Kell coefficient is 0.7, so for the PAL system, the vertical resolution of the last displayed image is about 400 lines. When actually viewing the test chart, the observed vertical resolution can usually reach about 450 lines because the Kell coefficient is not considered.
The vertical resolution is completely determined by the signal format, which is very easy to understand. Horizontal definition is the most easily confusing concept. The biggest problem is that there are multiple expressions of horizontal definition. In the field of video surveillance such as explosion-proof cameras, we are more accustomed to using the "per image height" of pixels to represent horizontal resolution, or "television lines." The origin of this habit dates back to 60 years before the television was born. At the time, because the format of the signal had determined the vertical resolution of the image, the experts' idea was to represent horizontal resolution in a manner that was related to vertical clarity. In other words, whether it is clearer in the horizontal direction or clearer in the vertical direction can be clearly seen through this relative clarity. For this reason, horizontal definition is defined as the number of pixels that can be displayed in the horizontal direction that is equal to the screen height. The definition obtained under this definition is called the "TV line", which is the so-called line number. Therefore, when you still hear how much clarity a video signal has, it doesn't mean how many pixels are from the leftmost to the rightmost edge of the image, but how many pixels are in the same horizontal width as the height of the image.
The image transmitted by the explosion-proof camera is not a boxy one. Generally, the display ratio is 4:3 or 16:9. That is, to achieve the same horizontal resolution as the vertical resolution, the pixels in the horizontal direction should reach 4/3 or 16/9 times the vertical resolution. Image sharpness = image quality of the signal source × processing level of the processing circuit × development quality of the display method. All three factors are equally important in determining the final image quality. Any difference in the links will result in a decrease in the horizontal resolution of the final image. Even if some products improve the processing circuit performance or the display performance, the image quality cannot be significantly improved without the corresponding signal source cooperation. Shiguo Technology Huanggong explained that the HD explosion-proof monitoring system requires not only a million HD explosion-proof surveillance cameras, but also the back-end processing and display of high-definition, so that performance can play better.
Similarly, as an indicator of the clarity of the explosion-proof camera monitoring picture, the three indicators of pixel, line number, and clarity may seem redundant to the contractor and the user, but for each professional manufacturer, these three indicators are: Indispensable is the measure of explosion-proof camera manufacturers tailor-made for the market. However, it is worth affirming that in the same product, any one of the three indicators will change, and the other two indicators will also change. This is why the relationship between the three is rarely paid attention.
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