Explosion-proof cameras are explosion-proof monitoring products, which are the cross-products of the explosion-proof industry and the monitoring industry. Because they can not use conventional camera products at high-risk flammability and explosive sites, they need products with explosion-proof functions and relevant certificates issued by national authorities. It is called an explosion-proof camera.
When choosing an explosion-proof camera, it is difficult for us to see the quality of the explosion-proof surveillance camera from the outside. It is only good or bad that the explosion-proof surveillance camera can be seen after use. At the time of selection, the manufacturer will give some parameters of the explosion-proof camera. These parameters can make certain judgments on the pros and cons of the explosion-proof camera. The so-called layman looks at the excitement, and the insider looks at the doorway. For those who are just in contact with the explosion-proof monitoring field, it is difficult to see the quality of the explosion-proof camera from that parameter.
White balance
White balance is a very important concept in the field of video camera, which can solve a series of problems of color reproduction and tone processing, and improve the authenticity of the picture.
Scanning system
This refers to the scanning format of the output image of the explosion-proof camera. The international scanning format usually has two types: PAL and NTSC. In China, it is usually PAL. The standard is 625 lines, 25 frames per second (25fps). The United States, Japan and other countries implement the NTSC system (29.97fps). Its size affects the playback speed of the picture.
Early explosion-proof cameras were based on intrinsically safe and positive pressure types. The intrinsically safe explosion-proof camera is characterized by intrinsically safe handling of the camera's circuitry. The electrical line output or input is designed to be controlled below the energy that would cause the hydrogen to ignite and explode, so that it does not generate sparks during normal operation. , arc and high temperature to avoid detonating explosive materials. The unit cost of this type of explosion-proof monitor structure is the biggest disadvantage, and it is not conducive to future upgrades. The positive pressure type is a common structure of the early American explosion-proof camera products. It is quite inconvenient to maintain in use. If it is not carefully maintained, the risk of detonation is quite large. This structure has been basically eliminated in addition to the fact that a very small number of Taiwanese manufacturers are still manufacturing.
Explosion-proof cameras are the core equipment of explosion-proof industrial TV systems. However, due to the unevenness of products on the market and the asymmetry of information, some “three no†manufacturers without certification, no production and no after-sales are free to change the national standards and reduce the quality. Request, shoddy. This mixed situation makes the selection of equipment the same as the fog, making it difficult to decide.
Horizontal resolution is a measure of image sharpness and is usually expressed in terms of line numbers (ie, TV lines, TVL). A line of television is 1.33 pixels when interlaced. In explosion-proof heads, both pixel values ​​and horizontal resolution are the main indicators for measuring picture clarity. Under normal circumstances, only the horizontal resolution index exceeds 1080i (2 million pixels) and 720p (92 million pixels) can be called high-definition imaging.
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