Infrared thermometer distance coefficient description
The distance coefficient is determined by the ratio of D:S, that is, the ratio of the distance D between the probe of the thermometer to the target and the diameter of the target to be measured. If the thermometer must be installed far away from the target due to environmental conditions, and a small target must be measured, a thermometer with high optical resolution should be selected.
The higher the optical resolution, i.e. increasing the D:S ratio, the higher the cost of the pyrometer. Raytek Infrared Thermometers D:S range from 2:1 (low distance factor) to over 300:1 (high distance factor). If the thermometer is far away from the target and the target is small, a thermometer with a high distance coefficient should be selected. The capacitance and inductance tester has the characteristics of small measurement workload, quick and easy, stable performance, accurate measurement, and high fault detection rate. It can also be used as the measurement of electrical equipment such as CVT and lightning arrester.
For a pyrometer with a fixed focal length, the focal point of the optical system is the minimum spot position, and the spot will increase near and far from the focal point, and there are two distance coefficients. Therefore, in order to measure temperature accurately at a distance close to and far from the focus, the size of the measured target should be larger than the spot size at the focus;
The zoom thermometer has a minimum focus position that can be adjusted according to the distance to the target. If D:S is increased, the received energy will decrease. If the receiving aperture is not increased, the distance coefficient D:S will be difficult to increase, which will increase the cost of the instrument.
The choice of infrared thermometer can be divided into three aspects:
Determine the temperature range:
Each type of thermometer has its own specific temperature range. Therefore, the temperature range to be used by the user must be considered accurately and comprehensively, neither too narrow nor too wide.
Determine optical resolution (distance and sensitivity):
The optical resolution is determined by the ratio D to S, which is the ratio of the distance D between the pyrometer to the target and the diameter S of the measurement spot. If you want to measure long-distance and small targets, you should choose a thermometer with high optical resolution. The higher the optical resolution, that is, the larger the D:S ratio, the higher the cost of the thermometer.
Measurements in bright backgrounds
If the target to be measured has a strong background light (sunlight or direct light), the accuracy of the measurement will be affected. At this time, the object should be used to block the strong light of the direct object to eliminate the background light interference.
Simple operation and convenient use:
The portable infrared thermometer should be intuitive, easy to operate, and easy for operators to use. It is a small, light, and portable temperature measuring instrument that integrates temperature measurement and display output. It can be displayed on the display panel. Display temperature and output various temperature information, some can be operated by remote control or computer software program.
