As a typical product of passive infrared technology, infrared thermal imaging technology applies infrared technology to receive the thermal radiation energy of objects and display it in the form of image in the form of temperature field. To be exact, the technology applied in the field of security should be called passive infrared thermal imaging technology, or infrared thermal imaging technology for short. The basic principle of infrared thermal imaging is that infrared optical lens focuses the infrared radiation emitted by distant targets on a highly sensitive infrared detector, which converts the infrared radiation into electrical signals, and then converts the visible images of adult eyes on the display screen after signal processing.

In foreign countries, infrared thermal camera has been widely used in security. And in domestic, current development also is very rapid. Because infrared thermal camera are stealthy-detecting, there is no need for light, so the cost of producing visible light is eliminated, and intruders cannot even know they are being watched. And can penetrate smoke, fog, rain, smoke cloud and other bad conditions to continue to work, visible distance up to several kilometers, very suitable for border patrol, violence defense, night reconnaissance, industrial security, equipment security, port security, commercial security and other fields.

Though infrared thermal imaging has been achieved good results in many areas, but the thermal imaging technology in the security industry has not emerged, with the advent of wisdom and peace city, the situation may change, in recent years due to party a needs to improve the performance of security systems, thermal imager in domestic demand in the field of security and the market prospect is broad.

First, wisdom and peace city dependence on monitoring will reach a new level, the traditional optical camera rely on natural or environmental light for video monitoring, it is difficult to meet the full range of intelligent city, all-weather image information needs, and thermal imaging camera without any illumination, rely on the object the infrared thermal radiation can enlarge the advantages will be further clear imaging, day or night can clearly target detection and discovery, the real wisdom city smooth running 24 hours a day.

Secondly, infrared thermal imaging technology belongs to the passive non-contact detection and identification, good concealment, free from electromagnetic interference, can accurately track thermal targets from a long distance, accurate guidance, strong detection ability, long acting distance, visually display the object surface temperature field, not affected by strong light, widely used.

Moreover, the fusion of thermal imaging technology and many new technologies will also reach a new height to better serve the construction of smart cities. For example, the combination of thermal imaging and uav can be more widely used in disaster relief, criminal capture, electric line patrol, scientific shooting, industrial and agricultural production, etc. Combined with intelligent transportation, it can effectively relieve road traffic pressure and provide real-time road traffic information to assist driverless cars to hit the road as soon as possible. It can also be more widely used in the monitoring of urban public places to effectively identify hidden targets in dark light and shade environment and reduce the probability of public security incidents.

As a mature technology, infrared technology has been applied in all walks of life. The infrared night vision technology has been applied in the field of security and protection, breaking through the difficult problem of night monitoring technology and truly realizing the 24-hour uninterrupted, all-weather monitoring applicable under various environments. The combination of infrared thermal imager and security system will be more widely used along with the demand of safe city construction and the increase of party A's more advanced demand, and will become an indispensable helper of security system and even the construction of safe city.