How to buy an infrared waterproof camera
In the security industry, the role of infrared waterproof cameras is becoming more and more important. From the surveillance cameras at the beginning, to the night vision cameras at the back, to the infrared night vision waterproof cameras, the technology is constantly being upgraded, and people ’s experience is getting more and more OK, so in the face of these high-tech products, how do users choose the product that suits them?
Pay attention to the following points when purchasing infrared waterproof cameras:
1. While giving the camera low illumination, also give the required value of the aperture F, and the zoom lens generally only gives a large value of 1: F, that is, a small value of the aperture F (large value of the actual size of the aperture), F = f / D, then D is a fixed value, and when the focal length of f is increased by 10 times, F becomes large (that is, the actual size of the aperture becomes small). Luminous flux will be greatly affected
2. When using automatic aperture lens, automatic gain control or automatic electronic shutter camera, the lens aperture F value will also change. For example, if there is a scene near the camera that reflects strong light back to the camera, or there is light nearby to illuminate the camera, the sensitivity of the camera will be reduced, the size of the automatic aperture will be reduced, and the luminous flux will be greatly affected.
3. Low illumination given by the camera. What is the concept of low light here? The video signal generated by the camera has a nominal value of 1V and a standard value of 0.7V, while the video signal value at low illumination is 1 / 3-1 / 2 standard plant. So the image of the camera in low light will never be "like daylight".
4. The protective cover also affects the effect of the infrared light. During the transmission of infrared light, the transmittance and reflectance are different through different media. Different window glass, especially the automatic defrost coated glass, have different attenuation of infrared light.
With the rapid development of infrared waterproof cameras and infrared night vision systems, the production and supply of infrared lights will also increase, but red light products are not as easy as some people think, and conditions are different in terms of technology, testing equipment, etc., I hope users Compare more and choose carefully. Users should read the instruction manual carefully before using the infrared waterproof camera infrared light, especially to ensure the attention of personal equipment. Check whether the compatibility mentioned above meets the requirements and whether the influencing factors to be considered are taken into account. If the requirements are not met, the equipment used can be adjusted in a timely manner.
Users should not increase the supply voltage without authorization, because the infrared waterproof camera infrared lamp is designed with both its full irradiance and reliability in mind. Increasing the power supply voltage may cause the infrared lamp to burn out, and it should not be dismantled and changed without authorization. If this is done, the manufacturer may no longer be responsible for repairs. If there is a problem with the infrared light of the infrared waterproof camera, you should contact the manufacturer or supplier.
5. The sharpness of the image produced by the camera at low illumination is measured with a TV signal test card. The black and white stripes require black reflectance to be close to 0% and white reflectance to be greater than 89.9%. Observations sometimes do not have such conditions, such as: the reflectance of leaves and grass is very low, the contrast is small, it is difficult to obtain a clear image.
Through the above introduction, do you understand something? Don't be blind when choosing these products, but only according to your own needs.
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