DUAL-OPTICAL-PATH OPTICAL CENTERING INSTRUMENT FOR ELIMINATING STRAY LIGHT

摘要

A dual-optical-path optical centering instrument for eliminating stray light, composed of a photodetector (1), an autocollimator (2), a polarizer (3), a polarization beam splitter (4), polarization analyzers (6, 7, 8), pancratic telescopes (9, 10), a computer platform (16), etc., wherein the polarization beam splitter (4) divides parallel light provided by the autocollimator (2) into reflected S light and transmitted P light; the S light is focused on the center of curvature of an upper surface of a detected lens of a to-be-detected optical part (11) by one pancreatic telescope (10) via the polarization analyzers (6, 7); the P light is reflected by a plane mirror (5) and is focused on the center of curvature of a lower surface of the detected lens by the pancratic telescope (9) via the polarization analyzer (8); and the photodetector (1) captures crisscross images of the reflected light in two optical paths, and the computer platform (16) calculates the center deviation of the detected lens, so as to adjust the lens according to the center deviation of the lens to conduct correction and centering. The instrument has low costs and a high measurement accuracy, and can measure the center deviation of two measurement surfaces of an optical component simultaneously, thereby realizing efficient and quick correction of the center deviation.