Compensating method for weak signal in rapid spectrograph short-ware calibration

Abstract

The invention discloses a compensating method for a weak signal in rapid spectrograph short-ware calibration, and belongs to the field of optical testing and measuring. According to the method, on the basis of the conventional spectral response degree testing method, a rapid spectrograph is calibrated in a segmentation manner; a remote-distance spectral response degree calibrating method is adopted within 450nm to 900nm; a near-distance calibrating method is adopted within a short-wave of 350nm to 450nm, and therefore, the strength of an output signal is improved; and subsequently, a distance compensation coefficient is introduced to compensate a short-wave measurement result. By utilizing the method, the difficult problem that the conventional rapid spectrograph is poor in spectrograph response degree measurement precision within a short-wave range as a standard light spectrograph is small in power and a CCD (charge coupled device) is relatively poor in response is solved, and the high precision calibration of the spectral response degree of the rapid spectrograph within the whole wave band of 350nm to 900nm can be realized; according to the method, the operation is simple, the accuracy is high and the generality is high; and meanwhile, the technical support for calibrating and measuring the spectral response degree of other spectrographs is provided.

Description

technical field [0001] The invention belongs to the field of optical measurement and testing, and mainly relates to a weak signal compensation method for short-wave calibration, in particular to a weak signal compensation method for fast spectrometer short-wave calibration. Background technique [0002] The fast spectrometer is generally composed of a grating spectrometer and a linear array CCD. The wavelength range used is generally 350nm to 900nm. It can complete the measurement of the full-band spectral responsivity at one time. Due to its wide measurement range and fast response, it is widely used in field spectral measurement. However, because the fast spectrometer is affected by the CCD responsivity and the spectral power distribution of the standard light source, the calibration results of its spectral responsivity are very good at 450nm-900nm, but relatively poor in the short-wave band, especially in the 350nm-450nm band. Poor, the spectral power of the standard lamp...

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Problems solved by technology

At present, there are no relevant reports on the effective method of reducing errors in short-wave calibration of fast spectrometers

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