Infrared thermal imaging camera is a detection system that detects infrared radiation energy (heat) in a non-contact way, converts it into an electrical signal, and then displays a thermal infrared image on a display, and can calculate the temperature value. Thermal imaging cameras can accurately quantify the detected heat, accurately identify and rigorously analyze heat-generating areas.

The basic working principle of the infrared thermal imager is that the infrared radiation passes through a special optical lens, is absorbed by the infrared detector and converts the infrared signals of varying strengths into electrical signals, and then after amplification and video processing, a thermal image is displayed on the display. . Its basic structure is shown in Figure 1.2, in which the infrared detector is the core component. At present, the new thermal imager mainly adopts the uncooled focal plane array technology, the detector is placed on the focal plane of the optical system, and the panoramic image of the target can be obtained without an optical-mechanical scanning system, which significantly improves its sensitivity and thermal resolution. Enhanced target detection range and recognition capabilities.

 

According to whether the equipped infrared detector needs a cooling device, the thermal imaging camera can be divided into cooling type and non-cooling type. Cooled thermal imaging cameras are the most sensitive thermal imaging cameras and can detect the slightest temperature differences between objects. When working, the refrigeration device works first to reduce the temperature of the detector, so that the thermal noise is reduced to below the level of the scene imaging signal, so that the detection sensitivity is higher, the error is smaller, and the detection temperature range is wider. In these aspects, uncooled infrared thermal imagers are beyond their capabilities, especially the non-uniformity of the focal plane array has a great influence on the measurement error. However, they do not require cryogenic refrigeration, have fewer manufacturing processes, higher yields, lower costs, and longer service life. In addition, uncooled thermal imaging cameras for R&D applications have higher resolution, which is conducive to accurate temperature measurement.

 

According to whether it has the function of temperature measurement, infrared thermal imaging cameras can be divided into temperature measurement type and non-temperature measurement type. The temperature measurement type can directly read the temperature value of any point on the surface of the object from the image, and can be used for non-destructive testing. The disadvantage is that the effective distance is relatively short. The non-temperature-measuring type can only observe the difference of thermal radiation on the surface of the object, which can be used as an observation tool, but the effective distance is relatively long.

 

Infrared thermal imaging cameras are widely used in many fields such as military affairs and national economy. Applications in the military field include weapon thermal sighting, vehicle-mounted vision enhancement, unmanned aerial vehicles, unmanned ground vehicles, observation and command vehicles, fire control and guidance, etc. In the field of temperature detection, it can be used to detect abnormal heating of power transmission lines, power generation equipment, mechanical equipment, etc., prevent and detect abnormal equipment, and can also be used to detect the heat insulation effect of houses. Find wall facades, hollows, water seepage and mildew, etc., and can also be used in electronic manufacturing, medical source measurement, etc. In the field of commercial visual enhancement, infrared imaging can effectively make up for the lack of human vision by using its advantages such as strong smoke penetration ability, long action distance, and strong image contrast. Infrared vision enhancement, etc.