Visible "heat" —— On infrared thermal imaging

With the rapid popularization of big data, artificial intelligence and computer vision technology and the upgrading demand of manufacturing industry, infrared thermal imaging technology has gradually entered people's field of vision.

Different from the previous visible light, infrared thermal imaging mainly relies on the thermal radiation emitted by objects to construct images, which not only adds a new dimension to machine vision, but also provides more information for professionals and decision makers.

Principle of infrared thermal imaging

When the temperature of an object is higher than absolute zero (-273), infrared rays carrying the characteristic information of the object will be continuously radiated to the surroundings, and this infrared radiation also carries the characteristic information of the object.

Using this characteristic, the imaging device can simulate the spatial distribution of the surface temperature of the object one by one after the power signal radiated by the heating part of the object is converted into an electrical signal by the photoelectric infrared detector. Finally, after systematic processing, the thermal image video signal is formed and transmitted to the display screen, and the thermal image corresponding to the thermal distribution on the surface of the object, that is, the infrared thermal image, is obtained.

(infrared thermal imaging principle)

Advantages of infrared thermal imaging

The principles of infrared thermal imaging and visible light imaging are different, as long as there is a temperature difference between objects. In view of this feature, infrared thermal imaging has the following advantages:

(1) has strong detection ability and can play a role from a long distance;

(2) Passive non-contact detection and identification has strong concealment;

(3) High-precision remote monitoring of multiple targets can be realized at the same time in harsh environment;

(4) Under the objective conditions such as strong light, the display of the temperature field image on the surface of the object is still unaffected.

Application field of infrared thermal imaging

Infrared thermal imaging technology can be widely used in environmental protection, inspection and quarantine, fishery supervision and other fields, which provides great convenience for production and life.

forest fire prevention

In a large area of forest, hidden fire is easy to cause fire, and it is difficult to find it in time only by manual monitoring, and it has often developed into an uncontrollable situation when it is found.

Infrared thermal imager can analyze the monitored target in real time by setting the upper limit of the target temperature. If the target temperature reaches the set upper limit, it will send out an alarm message, so as to quickly determine the location and scale of the fire point, nip the forest fire in the bud and eliminate the fire hidden danger.

epidemic prevention and control

Fever is one of the symptoms of novel coronavirus infection, and temperature measurement has become the first line of defense for epidemic prevention and control.

Using infrared thermal imaging temperature measurement technology, human body temperature can be detected quickly and accurately in a non-contact way. When the alarm temperature exceeds the threshold temperature, the equipment will automatically give an alarm to remind the staff to further check the body temperature, so as to realize rapid and accurate large-area body temperature screening and help prevent and control the epidemic situation.

Fishery supervision

Fishery illegal activities are usually carried out in the middle of the night or foggy days, and there are many problems such as law enforcement corner and difficulty in obtaining evidence.

Infrared thermal imaging equipment finds targets by detecting heat sources, which avoids the disadvantages that traditional supervision is difficult to find and identify in dark environment. The monitoring system can automatically detect the passing ships, and take the remaining images, which can replace the manual guard sentry and provide effective evidence.

As a new nondestructive testing technology, infrared thermal imaging technology has the advantages of non-contact, large area and fast response. With the deepening of the research on infrared thermal imaging detection technology at home and abroad, it is believed that infrared thermal imaging technology will play a greater role in more fields.