Radiation temperature measurement is a non-contact temperature measurement, which is often subject to external interference during measurement. These interferences can be roughly divided into interference in the optical path, interference from external light, interference from changes in emissivity, changes in ambient temperature and electromagnetic interference. Among them, environmental temperature changes and electromagnetic interference should be used when designing and producing thermometers. Fully consider. In the application, the ambient temperature range allowed by the instrument and the requirements for the power supply should be ensured. Some measures such as water cooling jacket and regulated power supply can be taken. This article focuses on the interference from optics.

Generally, the space distance that must be passed between the measured surface and the radiation thermometer is called the optical path. For example, to measure the surface temperature of the steel plate during rolling, a layer of oxide scale is often formed on the steel plate and constantly peels off; In order to cool the equipment and products, there is often a water film on the surface to be measured, and there is often concentrated water vapor near the surface to be measured; CO2, CO, O2, etc. are also selectively absorbed in the atmosphere. Gas and dust Wait. These are all interferences in the optical path, if not considered, it will bring a lot of errors, and even lead to the loss of the meaning of measurement!