[Abstract] At present, the infrared thermal imaging temperature measurement meets the needs of rapid and large-scale security investigations and is a veritable "technical model". At the same time, it is a long-distance, non-disturbing method. The test personnel do not need to stay and wait. The guards also maintain a safer distance from the test population, which effectively reduces the risk of infection.
With the peak of the return journey, how to effectively prevent and control the "return spread" of the epidemic situation has become a top priority. Recently, several railway stations have enabled thermal imaging temperature measurement technology to allow past passengers to complete temperature detection faster while entering and leaving the station. "It's faster and more efficient." The security staff of Shenzhen Railway Station commented on this.
During the SARS period in 2003, a thermometer was commonly used as a thermometer. At that time, the emergence of forehead guns was still a new thing. People were held by "pistols" to measure body temperature on their foreheads, and they were still not used to it. Now, stations, airports, etc. have started to use infrared thermography thermometers, and the results can be displayed in a few seconds. Once there is a temperature that exceeds the standard temperature, the thermometer will alarm. What the hell is this-black technology?
Human body temperature measurement "technical model"
Objects naturally radiate infrared light outside, which is different from the wavelength of visible light that we commonly see. Visible light presents the world that our eyes can see, while infrared light presents a world that we can't see.
Infrared temperature measuring equipment can sense the infrared light that we can't see and convert the temperature into numbers and images. Forehead guns and infrared thermal imaging devices are both infrared temperature measurement methods, but there is a big difference.
As can be seen from the figure above, compared with mercury thermometers and forehead guns, the two major advantages of infrared thermal imaging temperature measurement are "high efficiency" and "safe distance temperature measurement".
Both are infrared temperature measuring devices. Why are infrared thermal imaging products more efficient than forehead guns?
To put it simply, frontal guns, ear thermometers, etc. perceive the temperature of a "point", while infrared thermal imaging devices perceive a "face" consisting of thousands of points.
The former is like a single soldier, while the latter is like a huge army. Using an infrared camera is equivalent to using thousands of temperature guns simultaneously. For example, a thermal imager with a resolution of 60x120 can read the temperature of 19,200 points at a time, which is equivalent to more than 10,000 temperature guns working at the same time.
On the other hand, an infrared camera is a "face" temperature measurement, which can accurately measure the temperature of an object at a longer distance. At this point, forehead guns that sense the "point" temperature are limited. According to the optical principle, the larger the measurement distance, the larger the target area for accurate detection (as shown in the figure below), and the resulting temperature value will be affected. This limits the accurate temperature measurement distance of the forehead gun, which is only about 1 to 3 cm.
It can be seen that the current infrared thermal imaging temperature measurement meets the needs of rapid and large-scale security investigations and is a veritable "technical model". At the same time, it is a long-distance, non-disturbing method. The inspected persons do not need to stay and wait, and the on-duty personnel also maintain a safer distance from the inspected people, which effectively reduces the risk of infection.
Since it is so efficient and safe, can the collected body temperature be used for medical indicators? It is worth noting that infrared thermal imaging is not an accurate medical temperature measuring instrument. It is mainly used to quickly select some abnormal temperature in the crowd. And then cooperate with the thermometer of medical measures to make sure that no fever is missed.
It is understood that Huifan Enterprise has launched an infrared thermal imaging temperature measuring device with an accuracy of + 0.5 ° C. A large number of application practices have proven that the accuracy of + 0.5 ° C can fully meet the requirements of the initial screening of body temperature in public places. If equipped with a black body (-a calibration device), the accuracy can be higher, which can reach + 0.3 ° C.
Outbreak of thermal imaging companies
After the epidemic broke out, domestic core companies of infrared thermal imaging technology worked overtime during the Spring Festival.
Under urgent needs, the advantages of companies with independent research and development capabilities are prominent. "We have deployed infrared thermal imaging human body temperature measurement products more than two years ago. Through the accumulated experience of products and algorithms, we have derived a variety of product forms, such as temperature measurement gates, temperature identification terminal equipment, etc." Huifan Technology Product manager Vicky said. After continuous iteration and optimization, Huifan Technology Products such as human body temperature measurement and solutions have matured and can quickly respond to demand during epidemics. At the same time, the accuracy of infrared thermal imaging human body temperature measurement products is becoming more and more accurate. Even for economical handheld products, the accuracy is also achieved without blackbody calibration + 0.5 ° C, with blackbody + 0.3 ° C.
The epidemic situation has entered a tough period. Behind the rapid response, these technology companies have also been struggling to overcome many difficulties such as start-up time, material preparation, and transportation, and are on the battlefield of technological prevention and control. The peak of rework is coming. With the efforts of these enterprises, more places and regions in the country will be able to benefit from this efficient thermal imaging temperature measurement technology and contribute scientific and technological strength to the epidemic.