Research Of Transmissivity Measurement Technology In Wide Spectrum And Wide Beam System

Optical system transmissivity refers to the ratio between incident luminous flux and emergent luminous flux of optical instruments, and it reflects the optical system of energy losses and it is one of the important norm in optical system test. This article through to the traditional test system research and the analysis, was developed optical system transmissivity test instruments according to various sight. The system used the reflex optical systems and spectral modulation method designs completely symmetrical double channel test system. Its characteristic is the system testing spectrum have wide range, and it can be used in light field environment; Test beam diameter isφ60mm,it can avoid the effect by local differences caused by material of optical element itself and membrane layer uniformity, Using phase-locked amplifier signal acquisition, effectively extracted from the submerged the weak signal in the noise, enhances testing precision.This paper introduces the working principle of the system, the research and design of each subsystem such as the optical system, mechanical structure system and data collecting system, and the system is validated by experiment, and the testing precision can reach 0.5%.