What you want to know about the thermal imager is here!
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
예를 들어, 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. 예를 들어, 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. 그러므로, 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, 등. easy to be recognized by the human eye. The temperature is displayed in red, blue, 등.
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. 예를 들어, 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.
그러므로, 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.
Thermal imager for control of coronavirus infection
As a countermeasure for infectious diseases, daily temperature check is very important. 특히, the thermal imager has the following advantages and has been installed and used in various places.
- Real time measurement of large range temperature changes without contacting objects;
- Detect the far-infrared ray emitted by objects, so that even in the dark, distant objects can be detected;
3. Since the far infrared ray is transparent, it can be detected even if something blocks the line of sight.
When considering the introduction of thermal imager, it should be noted that it varies according to the use location and the inspection object. 예를 들어:
- The thermal imager also has a variety of shapes. The camera type and the ball cover type are often used to measure the temperature in a large range, while the gun type hand-held can measure one by one;
- It is very effective to equip AI thermal imagers in places where the number of people is unknown. Give an alarm when abnormal temperature is detected, and use it when it is difficult to spend time checking everyone coming and going in airports, hospitals, large commercial facilities, 등;
3. Handheld products are also used for independent measurement. Handheld measurements take time, but can reliably test everyone, and are often used in restaurants and commercial facilities as a response to infectious diseases.
The full name of the thermal imager is “infrared thermal imager”, which uses the infrared detector and optical imaging objective lens to receive the infrared radiation energy distribution pattern of the measured target and reflect it on the photosensitive element of the infrared detector, so as to obtain an infrared thermal image. This thermal image corresponds to the thermal distribution field on the object surface. Generally speaking, the infrared thermal imager is to convert the invisible infrared energy emitted by an object into a visible thermal image. The different colors on the thermal image represent different temperatures of the object being measured.
The structure of the infrared thermal imager is similar to a digital video camera. The main components include a lens that aims infrared radiation at the detector, as well as software and electronic equipment for processing and displaying thermal signals and thermal images. Compared with visible light camera, the resolution of infrared thermal imager is lower, because the thermal detector needs much more energy with sensing wavelength than visible light, which requires each sensing element to be significantly larger.
그러므로, the resolution of the thermal imager is much lower (fewer pixels) than that of a visible camera of the same mechanical size. Important parameters to be considered when selecting an infrared thermal imager include resolution, range (temperature measurement range/measuring range), field angle, focusing (focal length), thermal sensitivity, wavelength range, 등
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