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In 1964, Texas Instruments first developed and successfully developed the first generation of infrared imaging devices for military applications, known as Infrared Finder (FLIR). It uses an optical mechanical system to scan the infrared radiation of the object to be measured. The photon detector accepts two-dimensional infrared radiation, undergoes photoelectric conversion and processing, and finally forms a thermal image video signal, which is displayed on the screen. In the mid-1960s, the Swedish AGA company and the Swedish National Electric Power Bureau developed a thermal infrared imaging device with temperature measurement capabilities based on an infrared scanning device. This second generation infrared imaging device is often called a thermal imager.
In the field of security, infrared thermal imaging cameras are also commonly known as infrared thermal imaging cameras. The main technical principle is that infrared radiation emitted by objects is focused by optical lenses and then transmitted to infrared detectors. The detector sends information to the sensor electronics for image processing. The electronics convert the received data to an image that can be displayed on a standard video monitor or LCD display, or can be displayed on any networked computer. The composition of the optical system (imaging lens), infrared detectors and signal processing circuits is an important part of it. The performance, design and manufacturing level of each part directly affects the imaging quality and stability of the infrared thermal imager.
The infrared thermal imager shows the infrared thermal image of the measured object. This thermal image map corresponds to the heat distribution field on the surface of the object, which is essentially a thermal image distribution map of the infrared radiation of each part of the target object being measured. Because the signal is very weak, compared with the visible light image, lack of hierarchy and three-dimensional sense, so in order to more effectively determine the infrared heat distribution field of the measured target in practical applications, often use some auxiliary measures to increase the utility of the instrument, such as images Brightness contrast control, real standard correction, false color rendering, etc.
The infrared thermal imaging products applied in the security field can be divided into two types:
One is the observation thermal imager, which is characterized by its high thermal imaging sensitivity and strong ability to penetrate climatic conditions such as smoke, fog, and haze, so that it can continuously and effectively monitor targets throughout the day. Its applications include highways. Monitoring, airport takeoffs and landings, monitoring of important coastal border defense facilities, etc. In addition, the use of observational thermal imaging cameras in conjunction with visible light cameras and laser illumination, and the formation of linkage mechanisms, can be used in the surveillance field to carry out target search, tracking, and identification as well as multiple safety precautions.
The second is thermal imaging cameras, which increase the temperature measurement function on the basis of observational thermal imaging cameras. Its characteristic is that it is equipped with a long focal length lens so that the target temperature measurement distance can be extended to 1 to 2 kilometers or even farther. The accuracy of temperature measurement is similar to that of a hand-held thermometer. With the function of temperature measurement, the instrument can analyze and calculate the target temperature in real time, and the absolute or relative alarm temperature point can be easily set to avoid and eliminate the temperature. There are major fire hazards in the monitored targets. This type of instrument is widely used in forest fire prevention, urban high point fire fire warning and other fields.
Talking about the differences between infrared thermal imaging cameras and infrared thermal imaging cameras, Cheng Hao of Hangzhou Hikvision Digital Technology Co., Ltd. stated that “The application of infrared thermal imaging technology in the field of security mainly refers to infrared thermal imaging network cameras. Traditional thermal imaging cameras and thermal imaging network cameras can solve a series of problems such as single work of the thermal imager, inconvenience of installation, use of a large amount of manpower, lack of timely and effective data return, real-time online monitoring, and the like. The thermal imaging monitoring information is incorporated into the entire network monitoring platform, realizing no real, all-weather, large-scale monitoring. Through the network, thermal imaging images can be transmitted back to the monitoring center in real time for analysis.†Product Manager, Changzhou Mingjing Electronics Co., Ltd. Ruan Wu believes that the infrared thermal imager only needs to be able to sense the temperature of the heat, and it will not be too concerned about the details; while the infrared thermal imaging camera will require a higher level of technology because it requires a higher sensitivity in the temperature-sensitive radiation. It is best to see the approximate outline of the measured object.