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Test device of optical detector linearity range and test method thereof

A linear range and test device technology, applied in the field of linear range test devices, can solve the problems of high cost and complex optical path design, achieve the effect of reducing volume, simple optical path design, and avoiding the interference of multiple optical paths

Active Publication Date: 2012-10-10
BEIJING HAMAMATSU PHOTON TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since this method needs to use at least two optical paths, in order to avoid interference between optical paths, the optical path design is more complicated and the cost is higher.

Method used

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  • Test device of optical detector linearity range and test method thereof
  • Test device of optical detector linearity range and test method thereof

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Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1 Optical detector linear range testing device of the present invention

[0024] Such as figure 1 As shown, the optical detector linear range testing device of the present invention includes a light source, a monochromator, a light processing system and a detection system, wherein the light processing system includes a polarizer set and a light reduction plate set.

[0025] A variety of light sources can be used during linear range testing. In order to improve the test accuracy, it is best to use a monochromatic light source or a quasi-monochromatic light source to ensure that the attenuation coefficient of the light reduction film is constant when the light intensity changes. In addition, monochromatic light can also be obtained by a monochromator. To reduce interference from stray light, filters can also be used between the light source and the monochromator.

[0026] There are two functions of the light processing system: on the one hand, it attenuates ...

Embodiment 2

[0028] Embodiment 2 uses a special light reduction film to test the linear range

[0029] The specific test process is as follows: First, adjust the light reduction device so that the light intensity input to the detector is just below the lower threshold of the detector, move the special light reduction film out of the optical path, and adjust the light reduction device so that the detector can output signals, which is recorded as I 1 ; Then, the special light-reducing film is moved into the optical path to obtain the output signal I of the detector 2 , to calculate the dimming ratio I 1 / I 2 Finally, the incident light is attenuated to different degrees by the light reduction device, and the light reduction ratio I under different light intensities is tested. 1 / I 2 value, and plot the dimming ratio I 1 / I 2 Detector output signal I when moving out of optical path with special light reduction film 1 relationship curve.

[0030] Taking the photon counting probe as an ...

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Abstract

The invention relates to a test device of an optical detector linearity range and a test method thereof. The test device comprises a light source, a detection system and an optical processing system arranged between the light source and the detection system. The optical processing system comprises a light reducing apparatus and a light-splitting device. The light reducing apparatus comprises a polaroid group. The light-splitting device comprises a special light reducing piece or a spectroscope piece. The special light reducing piece is interacted and moved out and a test light path is moved in or the spectroscope piece is connected with a reference detector and a detected detector so as to test a linearity range. By using the linearity range test apparatus, an optical path design is simple, cost is low and test precision is high.

Description

technical field [0001] The invention relates to a test device and a test method for the linear range of an optical detector, in particular to a linear range test device with simple optical path design, low cost and high accuracy. Background technique [0002] For photodetectors, the linear range, that is, the output dynamic range, is one of the most important technical indicators. In the linear range, the signal of the detector output signal has a linear relationship with the radiant flux of the incident light. The detector cannot be operated beyond the linear range. [0003] The test of the linear range of the detector needs to meet two conditions: one is to be able to provide a light source with variable light intensity; the other is to be able to measure the response curve of the detector output changing with light intensity. [0004] The most basic method for testing the linear range is the distance inverse square method, that is, according to the inverse square law, t...

Claims

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Application Information

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IPC IPC(8): G01M11/02
Inventor 郭维新袁秀丽杨庆坤李妙堂
Owner BEIJING HAMAMATSU PHOTON TECH INC