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Method for correcting nonlinear response of photomultiplier and photoelectric detector and spectrophotometer obtained based on same

A non-linear response, photomultiplier technology, used in spectrometry/spectrophotometry/monochromator, electron multiplier details, color/spectral property measurement, etc., can solve the accuracy of spectrophotometer transmittance Low, photomultiplier tube nonlinearity and other problems, to achieve high transmittance accuracy, the effect of suppressing nonlinearity

Inactive Publication Date: 2010-06-09
陈陟岗
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of non-linearity in the response of the current photomultiplier tube and the low accuracy of the transmittance of the spectrophotometer, and to provide a method for correcting the nonlinear response of the photomultiplier tube and Photodetectors and spectrophotometers obtained based on this method

Method used

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  • Method for correcting nonlinear response of photomultiplier and photoelectric detector and spectrophotometer obtained based on same
  • Method for correcting nonlinear response of photomultiplier and photoelectric detector and spectrophotometer obtained based on same
  • Method for correcting nonlinear response of photomultiplier and photoelectric detector and spectrophotometer obtained based on same

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specific Embodiment approach 1

[0016] Specific embodiment one: the method for correcting the nonlinear response of photomultiplier tube in this specific embodiment, its process is as follows:

[0017] 1. Carry out wavelength scanning on the input optical signal of wide spectrum, and output a series of optical signals of different single wavelengths sequentially and in real time during the scanning process, G is a positive integer;

[0018] 2. Each of the G different single-wavelength optical signals obtained in step 1 is processed as follows one by one to obtain the non-linear correction equations of G different single-wavelengths:

[0019] 21. Perform light intensity modulation on the single-wavelength optical signal to be processed to obtain K optical signals with different light intensities;

[0020] 22. The K optical signals of different light intensities obtained in step 21 are sequentially input into the photomultiplier tube, so that the photomultiplier tube outputs K electrical signals in sequence, a...

specific Embodiment approach 2

[0024] Specific implementation mode two: combination figure 1 Illustrate this embodiment, the photodetector obtained based on the method described in Embodiment 1 of this specific embodiment, it comprises photomultiplier tube 1 and nonlinear response corrector 2, the optical signal input end of photomultiplier tube 1 is used as photodetector The optical signal input end of the device, the electrical signal output end of the photomultiplier tube 1 is connected to the electrical signal input end of the nonlinear response modifier 2, and the electrical signal output end of the nonlinear response modifier 2 is used as the electrical signal output end of the photodetector; The nonlinear response correction equation used when the nonlinear response modifier 2 corrects the received electrical signal is I out = A - BI in + CI in 2 , ...

specific Embodiment approach 3

[0026] Embodiment 3: The difference between this embodiment and Embodiment 2 is that the nonlinear response correction equation is I out = 0.9375 - 1.038 I in + 0.102 I in 2 .

[0027] This specific embodiment has the best correction effect on optical signals with a wavelength range of 400nm to 500nm.

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Abstract

The invention relates to a method for correcting nonlinear response of a photomultiplier and a photoelectric detector and a spectrophotometer obtained based on the same, solving the problem of nonlinear response of the current photomultipliers and the problem of low transmittance accuracy of the spectrophotometer caused by the previous problem. The method is characterized by obtaining a correction equation by correcting the photo-electric response curve of the photomultiplier, thereby correcting the electric signal output by the photomultiplier. The photoelectric detector comprises the photomultiplier and a nonlinear response corrector. The spectrophotometer comprises a light source, a monochrometer, a sample cell, the photoelectric detector and a calculation and display device. The photoelectric detector can be used for high accuracy photoelectric detection, and the spectrophotometer can be used for qualitative and quantitative analysis and corresponding optical measurement of the substances.

Description

technical field [0001] The invention relates to a method for correcting the nonlinear response of a photomultiplier tube, a photodetector and a spectrophotometer. Background technique [0002] Due to the characteristics of the semiconductor material of the photomultiplier tube, the photomultiplier tube cannot convert the optical signals of different intensities into electrical signals in a linear ratio, which is the nonlinearity of the response of the photomultiplier tube, due to the nonlinearity of the photomultiplier tube itself. The resulting systematic error is usually about 0.3-0.5%. The photomultiplier tube is mainly used in the spectrophotometer, but because the non-linearity of the response of the photomultiplier tube cannot be eliminated, the accuracy of the transmittance of the spectrophotometer is low, which can only reach the level of 0.3-0.5%. Transmittance is defined as the ratio of the intensity of light transmitted through the sample to the intensity of ligh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J43/04G01N21/31G01J3/10G01J1/02
Inventor 陈陟岗
Owner 陈陟岗
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