Entrance pupil voltage value calibration method and system in PST test and PST test system

Abstract

The invention belongs to the field of stray light test in an optical system, and in particular relates to an entrance pupil voltage value calibration method and system in PST test and a PST test system. The method comprises the steps that a standard laser light source is coupled into an integrating sphere, and a light beam emitted from the integrator enters a PMT detector through a chopper and anoff-axis polishing tube; the diameter of a star point and the radiance at the light exit of the integrating sphere are combined to calculate irradiance emitted by the off-axis polishing tube; the output voltage value of the PMT detector is measured by a lock-in amplifier; star point plates with different apertures are replaced, and the steps are repeated to acquire multiple sets of different (U, E) points; the responsiveness of the PMT detector under gain M1 is calculated according to the correspondence between the irradiance and the PMT output voltage; when PST test is carried out, the voltage value of the entrance pupil aperture of an optical system to be measured is calculated by combining the illumination of the light outlet of a collimator and the responsiveness of the PMT detector under gain M1. The problem that accurately acquiring the entrance pupil voltage is difficult when an attenuator is used or calculation and calibration are carried out is solved.

Description

technical field [0001] The invention belongs to the field of stray light testing of optical systems, and in particular relates to a calibration method and system for a light intensity value at an entrance pupil of a camera under test during the point source transmittance (PST) testing process of an optical camera. Background technique [0002] The point source transmittance (PST) is an important evaluation index of the stray light suppression ability of the optical system. Before the optical system, especially the space optical system, is put into operation, it is an indispensable part of the test to test the PST index in the ground laboratory. [0003] figure 1 It is the schematic diagram of the optical path for the point source transmittance test. When the parallel light beam is incident on the light inlet of the camera under test, the signal obtained on the focal plane of the camera is the energy after the stray light suppression and attenuation of the camera itself. The ...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a calibration method and system for the entrance pupil voltage value in the point source transmittance test, and provide a PST test system with the calibration system at the same time, which solves the problem of the entrance pupil voltage when using attenuation sheets or calculation calibration. Difficult to Accurate Questions

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