Device for estimating absolute light responsivity of photomultiplier tube under low light intensity condition

Abstract

The invention relates to the field of optical measurement, and discloses a device for estimating the absolute light responsivity of a photomultiplier tube under a low light intensity condition, which mainly comprises a laser, an attenuator I, a dark box, a beam splitter I, an attenuator II, a plane mirror I, a shutter I, a shutter II, a plane mirror II, a beam splitter II, a cassette, a silicon photodiode, and a to-be-measured photomultiplier tube, wherein the beam splitter I, the attenuator II, the plane mirror I, the shutter I, the shutter II, the plane mirror II, the beam splitter II, the cassette, the silicon photodiode, and the to-be-measured photomultiplier tube are all located in the dark box; the silicon photodiode and the to-be-measured photomultiplier tube are located in the cassette; the laser, the attenuator I, the beam splitter I, the shutter I, the plane mirror II, the beam splitter II and the silicon photodiode form an optical path I; the laser, the attenuator I, the beam splitter I, the attenuator II, the plane mirror I, the shutter II, the beam splitter II and the silicon photodiode form an optical path II; and certain angles exist between the attenuator I and the attenuator II and the optical axis of the measurement system.

Description

Technical field [0001] The invention relates to the field of optical measurement, in particular to a device for estimating the absolute light response rate of a photomultiplier tube under low light intensity conditions by using nonlinear correction to estimate the absolute light response rate of a photomultiplier tube. Background technique [0002] The measurement of extremely low-power light plays an important role in scientific research and industrial applications, such as astronomical observation, nuclear radiation detection, bioluminescence detection, and spectroscopy measurement. Photomultiplier tubes are used in photodetectors to measure the visible light region. Low-power light; the most common method for accurately measuring absolute light responsivity is to compare the measurement results of the detector under test with the data of a calibrated reference light source or photodetector. The disadvantage of the current existing technology is that the estimation of absolute ...

AI Technical Summary

Problems solved by technology

The defect of the current existing technology is that the estimation of the absolute photoresponsivity and the measurement of the linearity are carried out separately, and it is only for a certain spectral range or a certain narrow optical power range, relying on these experimental results is not enough to estimate Wide power range photoresponsivity measured by photomultiplier tubes, the device for estimating the absolute photoresponsivity of photomultiplier tubes under low light intensity conditions can solve the problem

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