Double grating common CCD spectrograph

Abstract

A double grating common CCD spectrograph disclosed by the present invention comprises double slits, a diaphragm, a collimating mirror, gratings, a planar turning mirror, a focusing mirror and a CCD detector. The double slits are used to place the optical fibers of double spectral coverage and are placed on a focal plane of the collimating mirror, the diaphragm is used to limit the calibers of thelight beams emitted out by the optical fibers of double spectral coverage, and the collimating mirror collimates the light beams emitted out by the optical fibers on the double slits into the parallellight; the gratings separates the colors of the parallel light collimated by the collimating mirror, the planar turning mirror is used to reflect the light beams after the color separation, the focusing mirror is used to focus the reflected light beams, and the CCD detector images the focused light beams. The double grating common CCD spectrograph provided by the present invention can avoid the usage of the mechanical motion parts, and enables the stability of an instrument to be increased and the size of the instrument to be shrunk.

Description

technical field [0001] The invention relates to the technical field of spectral detection instruments, in particular to a dual grating co-CCD spectrometer. Background technique [0002] In the field of traditional spectral detection, in order to obtain ultra-fine spectra of two different spectral bands, usually two spectrometers are required to detect these two bands respectively. Or adopt the way of switching gratings, use different gratings to detect a certain spectral segment successively. Both detection methods have certain defects. First of all, using different spectrometers to detect separately will increase the cost of using spectroscopic instruments, which is not conducive to the popularization and development of detection instruments. Moreover, the images detected by different spectrometers are not on the same image plane, so it is difficult to make an intuitive comparison. The method of switching the grating for sub-band detection requires adding mechanical movi...

AI Technical Summary

Problems solved by technology

First of all, using different spectrometers to detect separately will increase the cost of using spectroscopic instruments, which is not conducive to the popularization and development of detection instruments

Moreover, the images detected by different spectrometers are not on the same image plane, so it is difficult to make an intuitive comparison

The method of switching the grating for sub-band detection requires adding mechanical moving parts in the spectrometer, which will increase the volume and quality of the spectrometer, and at the same time reduce the stability of the instrument, which is not conducive to the long-term use of the instrument

Moreover, the spectrometer that uses the switching grating for sub-band detection cannot perform dual-band detection and imaging on the target at the same time, thus limiting the use and development of this method

In order to better perform spectral analysis on the target, it is necessary to detect the ultra-fine spectrum of different spectral bands of the target, but traditional spectroscopic instruments are difficult to achieve this requirement, thus limiting the development of spectral analysis technology

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