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As the rate of social crimes is not only increasing, the role of infrared in night surveillance is even more prominent. It is used not only by important departments such as vaults, oil depots, armory, library archives, cultural relics departments, and prisons, but also in general surveillance systems. . Even the residential area television monitoring project also uses infrared cameras. This shows that the use of infrared waterproof cameras is getting higher and higher, and has gradually developed into a trend.
1. Given the minimum illuminance of the camera, it also gives the required value of the aperture F, but the zoom lens generally only gives the maximum value of 1:F, that is, the minimum value of the aperture F (the maximum size of the actual aperture), F= f/D, then D is a fixed value. When the f focal length is increased by 10 times, F becomes large (ie, the actual aperture size becomes very small). Luminous flux will be greatly affected
2. When using an auto iris lens, automatic gain control, or automatic electronic shutter camera, the lens aperture F value also changes. For example, if there is a scene near the camera, the light is reflected back to the camera, or there is a light near the camera, the camera's sensitivity will be reduced, the size of the auto iris will be turned down, and the light flux will also be greatly affected.
3. The minimum illumination given by the camera. What is the minimum illumination concept here? The nominal value of the video signal generated by the camera is 1V, the standard value is 0.7V, and the video signal value at the lowest illumination is 1/3-1/2 standard. Therefore, the image of the camera at the lowest illumination will never be "like white."
4. The protective cover also affects the effect of the infrared lamp. In the infrared light transmission process, through different media, the transmittance and reflectance are also different. Different window glasses, especially automatic defrosting coated glass, also have different attenuation of infrared light.
With the rapid development of the infrared night vision system of infrared waterproof cameras, infrared lamp production and supply manufacturers will also increase, but the red light products are not as easy as some people think, but also have different conditions in terms of technology, testing equipment and equipment, and hope that users Too much to compare, choose carefully. The infrared light waterproof camera infrared light should be read carefully for the user first, especially for the personal equipment safety precautions. Check whether the supporting aspect mentioned above meets the requirements, whether the influencing factors that should be taken into account are taken into consideration, and if the requirements are not met, the equipment used can be adjusted in time.
The user should not arbitrarily increase the power supply voltage, because the infrared waterproof camera infrared light is designed to take into full consideration of its irradiance, taking into account its safety and reliability. Raising the power supply voltage may cause the infrared lamp to burn down, and it is even more desirable not to tamper with the infrared lamp. If this is done, the manufacturer may no longer be responsible for maintenance. If there is a problem with the IR waterproof camera infrared light, contact the manufacturer or supplier.
5. The sharpness of the image produced by the camera at the lowest illumination is measured by a TV signal test card. The black and white stripes require a black reflectance of approximately 0% and a white reflectance of greater than 89.9%. Observed sometimes do not have such conditions, such as: leaves and grassland reflectivity is very low, the contrast is small, it is not easy to get a clear image.
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