The epidemic is raging. In order to avoid repeated cross-infection of direct contact between inspection workers and people, non-contact personnel are intensively used in transportation hubs such as train stations, subways, airports, terminals, passenger stations, and hospitals, supermarkets, and enterprises. The non-sensing temperature measurement method implements personnel temperature detection, quickly screens suspected patients, and at the same time realizes rapid and efficient passage of personnel, controls crowd aggregation, and reduces the risk of cross-infection.
In nature, electromagnetic waves are radiated when the temperature of an object is above absolute zero (-273 ° C), and infrared rays are the most widespread form of electromagnetic waves.
The thermal imaging camera is to collect the infrared electromagnetic waves emitted by the object, convert the infrared signal into an electrical signal, and then display the radiant energy, that is, the temperature through different gray scales through the signal processing system. Different gray scales represent different temperatures to calculate the object temperature. And output pseudo-colour images that are easy to identify with the naked eye.
The thermal imaging body temperature monitoring system includes the following parts: at least one thermal imaging body temperature monitoring device for acquiring infrared radiation and visible light video images in the visible monitoring area, which includes an infrared thermal imager, a visible light camera, a gimbal and a temperature sensor. The infrared thermal imager and the visible light camera are set on the pan / tilt, the temperature sensor is used to correct the drift of the infrared thermal imager due to the change of the ambient temperature; at least one signal analysis device is used to analyze the thermal imaging body temperature monitoring The video signal collected by the device obtains the position and temperature information of each target in the monitoring area; the data management platform is used to provide the monitored personnel with information of the monitored objects and accept the monitoring personnel's instructions.
Thermal imaging body temperature monitoring system adopts infrared thermal imaging camera and video analysis to passively detect the target population, does not affect the normal activities of the inspected person, and can intuitively display the human body and its temperature on the video screen, and has high sensitivity. The detection speed is fast, the detection coverage is wide, no personnel is on duty, automatic recording, and the intelligent body temperature monitoring is realized, and any indoor gathering place can be installed and used. At the same time, this product has more hidden, fully automatic, all-time, all-weather characteristics.
The primary purpose of non-sensing temperature measurement is to screen out suspected "leakage fish", but if the temperature difference is too large, or it is difficult to view and manage the temperature data, the use effect is greatly reduced.
By setting the black body within the thermal imaging field of view, using the characteristics of the black body to carry out temperature measurement calibration, establish an accurate correspondence between grayscale and temperature, perform real-time correction of the measured temperature, and display the video screen and personal body temperature, which greatly improves the human body measurement The accuracy of temperature measurement reduces the temperature measurement error to ± 0.3 ° C. Accurate temperature measurement is convenient for staff management and investigation, so that early detection, early isolation and early treatment can be achieved, and the source of infection can be effectively and effectively controlled. This is responsible for society. It is also responsible for the prevention and control of the entire epidemic.
At present, our company has successfully developed a thermal imaging temperature measurement system (thermal imaging camera + blackbody) years ago, which can realize long-distance and large-area detection. The temperature measurement accuracy is as high as ± 0.3 ℃ in the measurement range of 30 ℃ ~ 45 ℃ Once a person with abnormal body temperature is found, the system will automatically warn and start a review program.
