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Like the CCD, the CMOS image sensor chip also responds to infrared light waves, but its sensitivity is much higher than that of the CCD image sensor chip in the range of 890 to 980 nm, and the attenuation gradient is also slower as the wavelength increases. With the rapid development of CMOS image chips, the noise signal is further depressing. Star-class CMOS cameras are already available.
1. The best selection of low-light camera, the illuminance requirements are generally ≤ 0.02Lux. Some camera manufacturers or vendors falsely report the minimum illumination, which greatly reduces the effective distance of night vision. Therefore, it is better to be able to test it.
2. The larger the size of the infrared camera image sensor, the better. The night vision camera selects the 1/2in CCD, absolutely cannot select 1/4in.
3. CMOS ultra-miniature cameras need to be selected on hidden occasions.
4. Have automatic electronic shutter function;
5. Have AGC automatic gain control function.
Lens Selection 1. The camera lens is the key equipment of the infrared camera. The quality (index) of the camera directly affects the imaging effect of the system. The following points must be noted when selecting the lens: 1. It is best to select the infrared lens. Due to the ordinary optical lens, the infrared light reflected from the object back to the lens cannot be effectively focused on the CCD target surface. At this time, the infrared night vision effect will be greatly reduced, so it is best to use an infrared lens. In particular, color-to-black cameras cannot otherwise make the day and night focal planes consistent, resulting in the inability of day and night images to remain clear;
2. The imaging size of the lens should be consistent with the camera CCD target surface size;
3. The resolution and transmittance of the lens must meet the requirements;
4. It is best to choose the auto iris lens to adapt to the large changes in day and night illumination.
5. If the distance is more than 1km, laser beam expander collimation lens is needed. According to the size and distance of the scene to be observed, an appropriate laser beam expanding and collimating lens is selected so that the laser beam can illuminate the scene to be monitored so that the reflected light of the monitoring scene can be received by the camera.
It is worth pointing out that the most important issue in the choice of infrared cameras is the set of features. In addition to infrared light, camera, lens, but also pay attention to the protective cover, power supply, etc. comprehensive consideration. For example, different window glasses, especially automatic defrosting coated glass, have different attenuation of infrared light, so it is necessary to pay attention to the protective cover of window glass with good performance. The most important issue for the selection of infrared cameras is the set of features. In addition to selecting the infrared light source, comprehensive consideration of the camera, lens, protective cover, power supply, etc. Only by taking into consideration the above-mentioned selection points, can we get a multiplier effect. Infrared Camera Frequently Asked Questions When the infrared camera is in the evening, it is white, glare, and snowy. There are the following reasons:
1, the lack of current causes the snow point to produce some outdoor short distance with centralized power supply 12V is convenient, but long-range infrared light heat, 12V power supply instability may lead to power is not enough; and there is no built-in heat sink in the current instability situation Under the prone to burnout; Second, the current decay speed block, may lead to the infrared lamp did not work properly, in the CCD illumination is relatively high and can not get the infrared light auxiliary light, so, fluttering snow;
2, poor quality of infrared light, infrared light angle and infrared distance with the lens does not match the snow drift. Many companies use a mixture of different angles to facilitate their own purchases and installations. The advantage of using them is that they can barely use different millimeter-sized lenses for the same type of lamp. The disadvantage is that people always feel the light's angle. With the distance and the lens is not suitable, when the angle is not suitable, flashlight phenomenon or narrow electric phenomenon is likely to occur;
3, handicraft problems: Many people when hand-made, the infrared light is not concentrated, astigmatism; scattered light leads to light everywhere, but a gray phenomenon; the front of the infrared light cotton is not tight, concentrated infrared red light so A vast phenomenon.
4, built-in is a poor camera, illumination is very high, many factories in order to obtain a brighter image under the same infrared light auxiliary light, artificially increase the sensitivity of the CCD; because many manufacturers use very poor for price competition Built-in camera, this kind of camera in the case of infrared light is insufficient light, so artificially increase the gain sensitivity of the CCD, with us on the hard disk video recorder to adjust the high brightness, is easy to appear snow phenomenon;
5, circuit design is not reasonable: the production of infrared cameras, not only the infrared light directly into the camera and then on the line, the second is to be installed before the camera circuit redesigned and aging treatment. Many small-scale processing plants on the market use cheap electronic components, buy inexpensive infrared lamps, and directly use soldering irons for soldering. There is no redesign or aging of the circuit; other factories that make low-end products to save money, The control circuit board control board removed or integrated with the light board, which can easily lead to infrared light by the circuit is unstable and heat, so that the original poor quality infrared light even more can not work;
6, another possibility is that in the case of more dust outside, especially in the field, it may be the camera's infrared light to shoot the tiny particles invisible to the naked eye, which does not turn on the infrared light during the day Under the naked eye and the camera does not feel obvious; this is the environment.
Infrared camera purchase and FAQ
Infrared camera to buy solid camera with CMOS and CCD are two.