Thermal imager is a non-contact temperature measuring instrument, which is a camera to display the surface temperature of objects. It is different from what is seen by the human eye or shot with an ordinary camera. The high-temperature area is displayed in red, and the low-temperature area is displayed in blue. By imaging and analyzing the thermal (temperature) distribution on the object surface, it is possible to scan, observe and determine the results of targets that cannot be determined and touched.
Application of thermal imager
The thermal imager is used in various situations. Here are some common application scenarios for Jinshikang Xiaojin:
1. Body temperature measurement
For example, during the epidemic, we currently use traditional infrared thermometers, forehead temperature gun thermometers and other hand-held thermal image thermometers, as well as infrared thermal imagers set up at the gate for collective scanning, which can easily and quickly grasp the human temperature, and because we can not touch the measurement, the risk of epidemic infection is greatly reduced.
2. Machine monitoring of plant and electrical facilities
The thermal imager has long been widely used in the field of industrial non-contact temperature measurement, such as the electronic industry. It can be widely used to detect PCB circuit boards, chips, LED, new energy batteries, energy-saving, charging piles and other circuits and equipment, and is an essential tool for electronic engineers to do thermal analysis.
3. Maritime surveillance
Of course, the thermal imager is not only used for temperature measurement, but also can be used to perceive things that cannot be seen by the naked eye. For example, for observation work such as marine surveillance, due to the necessity of the work, it is necessary to master the situation even at night or when the visibility is poor due to rain. Therefore, thermal imager has become a necessary monitoring tool.
Principle of thermal imager
We know that all objects above absolute zero will emit infrared radiation, and the size of this energy depends on the size of the absolute temperature, so we can measure the temperature from infrared radiation. The thermal imager detects the infrared ray, judges its intensity, and measures and displays the temperature of the object.
After the infrared ray emitted by the target object is received and scanned by the detector inside the thermal imager, A/D conversion, temperature conversion and image processing are carried out to make red, blue, etc. easy to be recognized by the human eye. The temperature is displayed in red, blue, etc.
Since a person’s vision depends on the state of visible light, the way they see is affected by weather and time.
Use thermal imager to measure body temperature
The temperature measurement of thermal imager is different from that of the thermometer we usually use. The thermocouple and thermometer commonly used in families are contact type using heat conduction. The thermal imager measures the surface temperature of our skin, which is greatly affected by the seasons and the external environment at that time. For example, the surface temperature will be lower when measured immediately after entering the room from the outside in winter, and higher when measured immediately after sports in summer.
Therefore, it is very important to consider the difference between the environment before and after the temperature measurement when using the thermal imager to correctly measure the body temperature.
As a device to further improve the accuracy of the thermal imager, the blackbody as a temperature calibration device can be considered. The blackbody is used as the reference light source when the thermal imager is used for temperature measurement. Because the blackbody temperature is used as the reference, the measurement error of the thermal imager can be reduced.