IR Illuminator Angle

- Sep 11, 2017-

With the rapid development of infrared night vision system, infrared lamp production and supply manufacturers will increase, but the red light product is not as easy as some people imagine, in the technology, testing equipment and other conditions are different, hope that users add more , Carefully chosen. Users use the infrared light first to carefully read the instructions, especially in order to ensure the safety of personal equipment precautions. Check whether the matching aspects described above meet the requirements, should be taken into account the factors that are taken into account, if not meet the requirements, can be adjusted in time to use the equipment.

Angle: infrared light conversion power is fixed, if you want to light angle, it will naturally sacrifice the distance, on the contrary, if the distance will ensure that the sacrifice angle! The choice of infrared light angle is a very important issue. The use of large angle infrared light with a small angle of the lens, there is a waste of light phenomenon. For example, an infrared light, light angle is 80 degrees, (equivalent to F3.5mm lens angle), if with the F35mm lens, then, there will be ninety-nine percent of the light in the lens field of view, but also That is, only one percent of the light is useful, the other is wasted. The use of small angle infrared light with large angle lens, the light angle is small, will appear in the image center of a spot, the surrounding relative brightness is low, which is usually said "flashlight" effect.

Under normal circumstances, the angle of the infrared light and the lens of the same angle, is the most scientific match. In addition, the infrared light is not the greater the angle, the better the screen effect. Some environments, infrared light angle is too large, but also affect the imaging, such as the corridor, because of its "narrow" features, if the infrared light angle, near the edge of the image is too bright, the formation of "light curtain" phenomenon distant center but not see , Only a white phenomenon. Therefore, the most appropriate approach is the corridor of the infrared light should be slightly narrower than the angle of the lens Second, you can use the "double lamp complementary" technology, wide angle and narrow angle infrared light with, adjust the position, you can achieve the angle and distance complementary effect.

In general, different focal lengths of the lens selection to adapt to the angle of the infrared light, infrared light angle under what conditions should not be greater than the angle of the lens, narrow environment should use a smaller angle than the lens infrared light. Narrow-angle infrared light through the match, you can get the ideal wide-angle effect, better results, lower cost.

(A) infrared light-emitting diode (LED) principle Infrared light-emitting body is composed of infrared light-emitting diode (LED) matrix. Infrared light emitting diodes from the infrared radiation efficiency of the material made of PN junction, plus forward bias to the PN junction injection current excitation infrared light. Spectral power distribution for the central wavelength of 830 - 950nm, half - peak bandwidth of about 40nm, as shown in Figure 1 (850nm, 940nm infrared light emitting diode spectrum diagram) shown. It is narrow band distribution, for ordinary CCD black and white camera can feel the range. The biggest advantage is that there can be no red storm (using 940 ~ 950nm wavelength infrared tube) or only weak red storm (using 850nm wavelength infrared tube); also has a long life characteristics.

(B) light control soft-switching circuit circuit The infrared light using a light control soft-switching circuit to reduce the impact of its working state transition to extend the life of infrared light.

(3) constant current constant current circuit to compensate for infrared light and winter infrared radiation power difference, the infrared light using a constant current regulator circuit, the infrared light-emitting diode optical power stability, thereby enhancing the use of infrared light effect, Extended service life.

(D) the choice of infrared light and the use of infrared light selection The most important issue is the infrared light and the camera, lens, protective cover, power supply, such as complete sets of. Some people have bought a surveillance camera, lens, shield, power supply, and even after installation to consider buying infrared light, which is not correct, should be in the design of all equipment on the integrated consideration, it is seen as an infrared low light Night vision monitoring system engineering to carry out the design.

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