Optical system transmittance is the ratio of optical instrument emergent light flux to the incident light flux,signifies the degree in which an optical instrument transmits the light radiant energy.It is a performance index in an optical system,especially in the telescopic optical system.Based on the correlation detection rule,an optical transmittance detection method with double beams and double frequencies was proposed.The method improves the precision of detection,fulfills it in the bright field and repl...
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