Using common sense with infrared thermometers
As the infrared thermometer in the use of the process will be subject to the weather environment, improper human operation and other factors of interference, a direct impact on the screening of people with fever. In order to ensure that the region's epidemic during the various choke points, business merchants, trade markets, medical institutions, factories, schools, supervisors to effectively play the role of infrared thermometer, effectively guide the public to scientific norms for the use of the thermometer, help our region back to work and resume production and resumption of the screening of school personnel, especially to the use of personnel to introduce and publicize its use.
What is the infrared thermometer: is through the front-end infrared machine identification of high temperature personnel, identification of high efficiency, the realization of non-contact intensive crowd face assisted temperature sensing to solve the efficiency of public places and controllable degree of access.
1, infrared thermometer is not through the glass to measure the temperature, glass has a very special reflection and through the characteristics, does not allow accurate infrared temperature readings. But can be measured through the infrared window temperature. Infrared thermometer is best not used for bright or polished metal surface temperature measurement (stainless steel, aluminum, etc.).
2, infrared thermometer can only measure the surface temperature of the object, can not measure its internal temperature.
3, to carefully locate the hot spot, find the hot spot, use it to aim at the target, and then do the up and down scanning movement on the target until the hot spot is identified.
4,When we use it, we should pay attention to the environmental conditions:smoke vapor, dust and so on. They will block the optical system of the instrument and affect the accurate temperature measurement.
5, the use of infrared line pyrometer, but also pay attention to the ambient temperature, if it is suddenly exposed to ambient temperature difference of 20 degrees or higher, allowing the instrument to be adjusted to the new ambient temperature within 20 minutes.
In the use of infrared thermometer to measure the temperature, the infrared energy emitted by the object under test, through the optical system of the infrared thermometer in the detector will be converted to an electrical signal, the signal temperature readings are displayed, there are several decisions to accurately measure the temperature of the important factors, the most important factors are the emissivity, the field of view, the distance to the light spot and the location of the light spot. Emissivity, all objects reflect, transmit and emit energy, and only the emitted energy is indicative of the temperature of the object. When an infrared thermometer measures surface temperature, the instrument receives all three types of energy. Therefore, all infrared thermometers must be adjusted to read only the emitted energy. Measurement errors are usually caused by infrared energy reflected from other light sources. Some infrared thermometers can vary the emissivity, and emissivity values for a wide range of materials can be found in published emissivity tables. Other instruments have a fixed emissivity sub-set to 0.95. This emissivity value is the surface temperature of most organic materials, paint, or oxidized surfaces, and is compensated for by applying a tape or flat black paint to the surface being measured. When the tape or lacquer reaches the same temperature as the substrate material, the temperature of the tape or lacquer surface is measured as its true temperature. Distance to Spot Ratio, the optical system of an infrared thermometer collects energy from a circular measuring spot and focuses it on a detector. Optical resolution is defined as the ratio of the distance from the infrared thermometer to the object to the size of the spot being measured (D:S). The larger the ratio, the better the resolution of the infrared thermometer and the smaller the spot size. Laser aiming, only used to help aim at the measurement spot. The latest improvement in infrared optics is the addition of a near-focus feature that provides accurate measurements of small target areas and also protects against the effects of background temperature. Field of view, ensure that the target is larger than the spot size of the infrared thermometer measurement, the smaller the target, the closer it should be. When accuracy is particularly important, ensure that the target is at least 2 times the spot size.
