Abstract:The surface absorption loss of optical components is an important index to measure the optical performance of optical components. The attachment of particle pollutants usually causes a significant increase in the surface absorption loss of optical components. In this paper, based on the temperature rise detection method of infrared thermal imager, the influence of several typical particle pollution on the surface absorption loss of high reflective mirror is studied, and the stepped distribution absorption and discrete distribution absorption models are established according to the distribution characteristics of particle pollutants. Considering that the temperature measurement accuracy is affected by the spatial resolution of the infrared thermal imager, the temperature rise data in a single pixel is extracted for finite element analysis, and the local absorption loss on the surface of the coated element with the accuracy equivalent to that of a single pixel is obtained. Combined with the scanning results under the microscope, the simulation model is further optimized to obtain the absorption loss of particulate pollutants on the surface of the thin film element.
