1. High technical requirements of high resolution thermal imaging camera
In terms of technical information, the current technical information bottleneck of infrared monitoring high resolution thermal imaging camera is that due to the difference in infrared wavelength and visible light, when the visible light is strong during the day and the infrared light is also strong, infrared monitoring high resolution thermal imaging camera will encounter exposure interference problems; In addition, due to the difference in the focus point of the infrared light and the visible light, the problem of out-of-focus will occur when used at night, which puts forward higher conditions for the camera's high-definition thermal imaging quality.
For the external infrared lamp type infrared model, the general condition setting camera should choose to use black and white or a product with day-and-night color to black-and-white function, and can sense 750-830nm infrared light. The camera ccd size is 1/3", the illuminance is 0.001lux On the bottom, with infrared light penetrating ir filter to enhance the camera's infrared light sensing ability and to ensure high-quality night high-definition thermal imaging effect.
2. Sensitivity requirements of high resolution thermal imaging camera
For integrated products with built-in LED infrared lamps, higher conditions are also put forward for the sensitivity of high resolution thermal imaging camera. These are the main directions of active research and development by many manufacturers at present.
In this regard, on the one hand, many manufacturers currently use the method of increasing the light gain of the camera to achieve the problem of excessive image brightness when completing infrared high-definition thermal imaging; at the same time, they also use multi-layer coated lenses to overcome the problem of infrared light defocusing at night.
On the other hand, infrared filter (ir cuter) technical information is also a key. Generally speaking, the infrared light wavelength range is between 750-830nm, but in fact, many product filters can not completely filter the visible light in this range, so it will affect the exposure and high-definition thermal imaging effects, and the image is mostly the bright purple. At present, more and more manufacturers use the color-to-black dual filter switching technology information to try their best to reduce the negative impact of visible light on infrared imaging.
The dome camera with infrared led light is also a popular product at present, but it is more difficult to process the information of infrared high-definition thermal imaging technology. Firstly, the product conditions of the dome camera have extremely high airtightness, and the built-in infrared led light will show a certain amount of heat and is not easy to dissipate heat. If the dome camera is not well closed, it will easily form water mist on the dome camera wall. Affects imaging; secondly, because the dome cover uses acrylic material, its transparency and curvature are also different, the light emitted by the built-in infrared lamp will shine on the dome cover and reflect on the lens, so that a bright light appears in the captured picture, resulting in unclear high-definition thermal imaging of the image. These are issues that manufacturers are working hard to solve.
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