Design of a parallel light incident optical system for non-contact temperature measurement

Non-contact temperature measurement is an optical analysis based on the infrared radiation intensity signal emitted by the measured object. To address the issue of transmittance differences caused by varying incident angles of light in different wavelength bands through the filter, a light path system combining off-axis mirrors and modified compound parabolic concentrators (CPC) has been designed. This system allows the incident light to pass parallel through the filter, then directs it into the rear-end CPC and collects it as an optical signal by the detector. This method significantly improves the utilization efficiency of different filters for specified wavelength light while avoiding adverse effects caused by other light entering, providing a solution for optical path design and signal collection in non-contact temperature measurement.