Pinhole-like transient weak illuminometer

Abstract

The invention discloses a pinhole-like transient weak illuminometer, belonging to the field of optical testing and measuring. The illuminometer comprises a conjugated lens, a pinhole diaphragm, a weak light counting head which is provided with an impulse type photomultiplier, a photon counting system and a computer which is provided with an illumination measuring software package. The conjugated lens is used for imaging a light beam of a weak light source of a facula which is demarcated at phi 0.2mm or a small facula to be tested at the center of the pinhole diaphragm; the weak light countinghead is used for detecting the pinhole pinhole imaging and converting the pinhole imaging into an electric impulse signal; the photon counting system is used for identifying and processing the electric impulse signal and outputting the impulse count which corresponds to the sampling period thereof to the computer; and the computer is used for processing the impulse count to obtain an illuminationcurve which is changed along with the time and a mean illumination value within the measuring time. The illuminometer solves the problem of the direct and exact demarcation of the facula phi 0.2mm and the illumination value 1.08*10<-4>1x on the cathode surface of a micro light image intensifier, can realize the illumination measuring function of the stable or the transient week light source of the large facula and the small facula, and has wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of optical testing and measurement, and mainly relates to a transient illuminance testing instrument, in particular to a pinhole-like transient weak illuminance meter based on photon counting technology. Background technique [0002] In recent years, with the rapid development of national defense science and technology industry, the requirements for low-light measurement are getting higher and higher in the fields of space astronomy detection, fluorescence detection, military night vision reconnaissance and low-light technology. In the development of the low-light image intensifier, according to the requirements of the national military standard, it is necessary to use a low-light illuminometer to measure the 1.08×10 -4 The 1x illumination value is calibrated to ensure the measurement accuracy of the signal-to-noise ratio parameter of the low-light image intensifier, thereby providing a reliable measurement ...

AI Technical Summary

Problems solved by technology

[0004] Due to the poor signal-to-noise ratio of small light spot weak light measurement and the difficulty of photon counting identification, there is no public report at home and abroad on a pinhole-like transient weak light meter that can achieve these two functions

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