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A thermal imaging camera is a camera that displays by receiving infrared light emitted by an object. Any object with temperature will emit infrared rays. The thermal imager is to receive the infrared rays emitted by the object, display the temperature distribution on the surface of the measured object through colored pictures, and find out the abnormal point of temperature according to the slight difference in temperature, so as to play the role of maintenance. Also commonly known as IR thermal imagers.

1. Working principle of IR thermal imager

Natural light is composed of light waves with different wavelengths. The visible range of the human eye is roughly 390-780nm. The electromagnetic wave shorter than 390nm and the electromagnetic wave longer than 780nm cannot be felt by the human eye. Among them, the electromagnetic waves with wavelengths less than 390nm are located outside the violet of the visible light spectrum and are called ultraviolet rays; the electromagnetic waves longer than 780nm are located outside the red of the visible light spectrum and are called infrared rays, and their wavelengths are from 780nm to 1mm.

The thermal imager technology uses a micro thermal radiation detector, an optical imaging objective lens and an optical-mechanical scanning system to receive the infrared radiation signal of the measured target. On the element, that is, the infrared thermal image of the object to be measured is scanned and focused on the unit or spectroscopic detector. The infrared radiation energy is converted into electrical signals by the detectors, and then converted into standard video signals through a TV screen or monitor. Displays an infrared thermal image.

Ⅱ. The advantages of infrared thermal imaging cameras

(1) Infrared thermal imaging system is a passive non-contact detection and identification technology, which has good concealment and is not easy to be discovered. Compared with infrared supplementary light products, it can avoid the occurrence of red exposure and other phenomena, and can easily realize concealed monitoring.

(2) Infrared radiation camera is the most widespread radiation in nature, and the atmosphere, smoke clouds, etc. can absorb visible light and near-infrared light, but it is transparent to 3-5 μm and 8-14 μm infrared rays. Therefore, these two wavelength windows are used, the target to be monitored can be clearly observed in a completely dark night, or in a harsh environment such as rain, snow and other smoke clouds. It is because of this feature that infrared thermal imaging technology can truly achieve 24h all-weather monitoring.

(3) Intelligent thermal surveillance system and identification of camouflaged and hidden targets. Generally, camouflage is mainly to prevent visible light observation. For example, criminals usually hide in the grass and woods when committing crimes. Because of the harsh outdoor environment and human visual illusion, it is easy to make wrong judgments and not recognize them. The thermal imager system passively accepts the thermal radiation of the target itself. When the human body and the vehicle are hidden in the grass and woods, its temperature and infrared radiation are generally much larger than those of the grass and trees, so it is easy to be automatically identified. In addition, ordinary surveillance cameras cannot see the hidden objects hidden under the surface of the luminous object, and cannot effectively detect and identify buried stolen items. Infrared thermal imaging cameras developed using infrared thermal imaging technology can detect and identify, because when a surface is messed up, the thermal profile of the surface will also be destroyed, such as the thermal radiation and compaction of the soil that has been turned over. The soil heat radiation is different. Therefore, buried stolen goods, etc. can be found through this function of the infrared thermal imaging camera.

(4) Infrared thermal imaging technology can intuitively display the temperature field on the surface of the object, which is not affected by strong light, and is widely used. Then, the temperature of each point on the surface of the object can be measured at the same time, and the temperature field of the surface of the object can be visually displayed and displayed in the form of an image.