Weak light signal spectrum fast test device and method

Abstract

The invention provides a weak light signal spectrum fast measuring device and method. On the basis of a light source spectrum power distribution test method of a light splitting type spectrum measurement system, a face array CCD (charge coupled device) is adopted for replacing an original line array CCD, tiny light signals can simultaneously complete multiple times of measurement, the intensity of output signals can be improved through the processing on measuring results, meanwhile, the random noise is eliminated, and the fast measurement of the tiny light signal spectrum power distribution is realized. The weak light signal spectrum fast measuring method has the advantages that the measurement speed is high, the precision is high, the operation is simple, the universality is high, and the technical support is provided for the spectrum test of other kinds of spectrum instruments.

Description

technical field [0001] The invention belongs to the field of optical measurement and testing, and mainly relates to a testing method for the spectral distribution of a light source, in particular to a rapid testing device and method for the relative spectral power distribution of weak light signals. Background technique [0002] Spectral measurement systems can generally be divided into two types: interferometric spectral measurement systems and spectroscopic spectral measurement systems. Among them, the interferometric spectral measurement system obtains the spectral information of signal light through Fourier transform, which is especially suitable for the detection of weak optical signals, but in practical applications Among them, the interferometric spectral measurement system has a complex structure and high cost; while the spectroscopic spectral measurement system is based on the principle of prism or grating, which separates the light to be measured by wavelength, dete...

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Problems solved by technology

[0002] Spectral measurement systems can generally be divided into two types: interferometric spectral measurement systems and spectroscopic spectral measurement systems. Among them, the interferometric spectral measurement system obtains the spectral information of signal light through Fourier transform, which is especially suitable for the detection of weak optical signals, but in practical applications Among them, the interferometric spectral measurement system has a complex structure and high cost; while the spectroscopic spectral measurement system is based on the principle of prism or grating, which separates the light to be measured by wavelength, detects optical signals of different wavelengths, and obtains the spectral characteristics of the signal. Usually, linear array CCD is used for spectrum testing. At present, in field spectrum measurement, there are more and more fast measurement requirements for weak signal spectra. For weak optical signals, linear array CCD generally adopts the method of increasing the integration time for measurement, and Only one set of spectral information can be collected each time, which cannot meet the accuracy requirements of the measurement. To achieve high-precision measurement, the average value of multiple measurement results must be taken, which increases the measurement time and cannot meet the requirements of real-time and fast measurement on site. Therefore, for the spectroscopic spectrum measurement system, at present, there are no relevant reports on the rapid measurement method of the weak light signal spectrum.

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