Thermal network camera|Introduction to the basics of thermal imaging cameras

Jan 29, 2022

Thermal network camera|Introduction to the basics of thermal imaging cameras
Thermal network camera
The basic principle of thermal imaging is: Infrared radiation emitted by an object is focused on an infrared detector through an optical lens. The detector converts the infrared radiation into an electrical signal, which is processed by hardware circuitry, translating the data from the detector into an image that can be viewed on a viewfinder or standard video monitor or LCD display.
From the structural analysis, the thermal imaging camera and the visible light camera are basically the same in structure, and the main components include lenses, detectors, circuits, software, and housings. Or according to different product forms, add some shields, gimbal and so on. However, the lenses and detectors used by infrared thermal imaging cameras are quite different from those of visible light, and it is precisely because of this difference that there is a huge price gap between the two.
The metal germanium used in the motorized zoom lens used in infrared thermal imaging is a "sparse metal" element. Although the reserves in nature are not low, it is very difficult to extract high concentrations of germanium. Because germanium often exists in other minerals in the form of isomorphism, it is difficult to form an independent germanium deposit with independent mining value. It can only be comprehensively recovered and comprehensively utilized in dressing and smelting when the main metal deposits are mined. Therefore, the lens of thermal imaging camera is more expensive than that of general camera.
With the diversification of use requirements and the continuous improvement of manufacturing processes, germanium lenses have now developed various products such as manual zoom, electric zoom, athermal fixed focus, and continuous zoom to meet market demand.
(1) Fixed focus lens
A prime lens is the simplest lens, it can only be used within a certain depth of field, outside the depth of field, the image will be blurred. Such systems are generally used under specific conditions, or where the focal length is short enough to allow the depth of field to suffice for the working distance.
(2) Manual zoom lens
By adjusting the hand wheel to change the lens position, the system has a deeper longitudinal viewing range, and can adjust the image blur caused by temperature.
(3) Electric zoom lens
The lens is driven by the motor, so that the system has a deeper longitudinal observation range, and at the same time, it can adjust the image blur caused by temperature.
(4) Continuous zoom lens
There are many fields of view that can be switched. Users can switch the field of view at any time according to their own situation and find a suitable field of view to observe. Design and installation are very difficult and costly.