A Method of Controlling Integral Time of CCD Photodetector with Adaptive Light Intensity

Abstract

The invention belongs to the technical field of photoelectric testing and relates to a method for controlling the integration time of a CCD photodetector. A CCD photodetector integration time control method of adaptive light intensity, comprising (1): initial integration time is set as t i , where t min <t i <t max ;(2): collect spectral signal [s 1 ,s 2 ..., s m ], calculate the spectral signal mean s avg ;(3): Acquisition and calculation of spectral noise σ dark ;(4): judge s avg and δ·σ dark , δ is the influence factor of dark noise: if s avg <δ·σ dark , set the integration time to t j , t min <t j <t max , and t j ≠t i , and go to step (1); if s avg ≥δ·σ dark , denoise the spectral signal first, and then set the integration time. The method of the present invention adjusts the integration time adaptively according to the light intensity, and simultaneously considers the influence of dark noise on the output signal to adjust the integration time adaptively. Scenes.

Description

technical field [0001] The invention belongs to the technical field of photoelectric testing and relates to a method for controlling the integration time of a CCD photodetector. Background technique [0002] As the light-receiving device in the spectrum analyzer, the CCD photodetector can realize the photoelectric conversion of the signal, and has become the focus of research due to its advantages of low power consumption, low operating voltage, stable performance, high sensitivity, and large dynamic range. With the miniaturization and intelligent development of the spectrometer, higher requirements are put forward for the control of the integration time of the CCD photodetector. [0003] The electrical signal output by the CCD photodetector is proportional to the light intensity and the integration time. Under the condition of a certain integration time, when the light intensity is too strong, the signal overflows, which causes the measured spectrum to be distorted; when th...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the integration time of the spectrometer is usually set manually, that is, the integration time is manually set according to the collected signals and empirical values. The disadvantage of manual setting of the integration time is slow speed and weak environmental adaptability

And the manual setting method cannot eliminate the influence of dark noise on the output signal, thus affecting the precision and accuracy of spectral measurement

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