An Accurate Measurement Method of Signal-to-Noise Ratio of Fiber Optic Spectrometer

Abstract

The invention provides an accurate measurement method for the signal-to-noise ratio of a fiber optic spectrometer. The method includes the following steps that first, related devices are connected; second, measurement on the signal-to-noise ratio of the fiber optic spectrometer under different light intensities is achieved; third, the specific value between a correction average value mu of a signal corresponding to the ith exposure pixel of an array photoelectric detector and a jittering value sigma of a signal deflection average value is calculated through N times of signal acquisition and measurement. By the adoption of the scheme, the method can adapt to the measurement requirement of the signal-to-noise ratio of the fiber optic spectrometer, not only can influences of stray light be decreased or reduced, but also the intensity of incident light of the fiber optic spectrometer can be conveniently and fast changed through a variable optical attenuator, and accurate measurement on the signal-to-noise ratio of the fiber optic spectrometer under different light intensities is achieved.

Description

technical field [0001] The invention belongs to the technical field of accurate measurement of the signal-to-noise ratio of an optical fiber spectrometer, and in particular relates to an accurate measurement method for the signal-to-noise ratio of an optical fiber spectrometer. Background technique [0002] The use of array optoelectronic devices as detection devices has been widely used in miniaturized fiber optic spectroscopic instruments for spectral analysis of signals from ultraviolet to near-infrared bands (190nm-1100nm). Optical signal-to-noise ratio, as the main criterion for distinguishing signal and noise, is an important technical index reflecting this type of spectroscopic instrument, reflecting the characteristics of the evaluation instrument such as weak light response and detection tolerance. In the prior art, only theoretical research and experiments on the signal-to-noise ratio of Fourier transform spectrometers and imaging spectrometers have been described....

AI Technical Summary

Problems solved by technology

[0005] Shortcomings of the prior art: 1. The prior art measures under a fixed light intensity, and cannot accurately measure the signal-to-noise ratio under different input light intensities; 2. The prior art uses an integrating sphere as The incident light source and the ambient background light will become stray light and enter the spectrometer, which is not conducive to the accurate measurement of the signal-to-noise ratio of the optical system; 3. In addition to the exposure pixels of the array photodetector, there are some non-exposure pixels on its edge. The existing technology The non-exposed pixel signal is not effectively utilized as a dark response to measure the signal-to-noise ratio

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