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Snapshot grating spectrometer

A grating spectrometer and snapshot technology, which is applied in the field of spectroscopic instruments, can solve the problems of high cost, complicated device processing, and the inability of snapshot grating spectrometer to simultaneously meet the requirements of wide-spectrum measurement, high luminous flux and high resolution, and achieve high cost performance and high resolution. Broad Spectrum Measurements, Effects of Size Reduction

Active Publication Date: 2021-06-18
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, snapshot grating spectrometers cannot meet the requirements of wide-spectrum measurement, high luminous flux and high resolution at the same time
Replacing the ordinary grating with a new type of dispersion element requires precise adjustment of the diffraction optical path, and the processing of the device is complicated and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Adopt image slicer (21) as collimating mirror among the present embodiment, spherical mirror (41) is as imaging mirror, dispersion element is common plane blazed grating (31), and grating constant is 600lp / mm, and blaze angle is 10.37 °, detects The device is an area array CCD (51), and the system simulation structure diagram is as follows Image 6 shown.

[0079] The number n of the spherical sub-mirrors of the image splitter is set to 5, and the wavelength range is 200-1000nm.

[0080] One method that can be used is to divide the wave band evenly, and divide the wavelength into five groups. 840nm), 920nm (840–1000nm).

[0081] attached Figure 5 shows how a composite blazed grating works, where i n is the incident angle, θ bn is the diffraction angle, θ Bn For the shining angle. In order to facilitate the reception of the detector, each sub-grating can have the same diffraction angle for the main light of the central wavelength of different bands, and the incid...

Embodiment 2

[0092] Present embodiment adopts image splitter (21) as collimating mirror, spherical mirror (41) as imaging mirror, dispersion element is composite blazed grating (32), grating constant is 600lp / mm, detector is area array CCD (51) , the system simulation structure diagram is as follows Figure 11 shown.

[0093] Set the number n of the spherical sub-mirrors of the image splitter to 5, for the wavelength range of 200-1000nm, the focal length of the image splitter and the imaging mirror are both 100mm, the incident slit is 20μm, and the chief ray targets the image splitter The two-dimensional deflection angle (δ x ,δ y ) is (0°, 7.5°), the incident angle of the chief ray to the composite blazed grating is 5°, and the main parameters of the designed optical path are shown in Table 2.

[0094] The main design parameters of the optical path of the second embodiment of Table 2

[0095] Band range Δλ 200–360nm 360–520nm 520–680nm 680–840nm 840–1000nm gr...

Embodiment 3

[0098] Present embodiment adopts as collimating mirror like splitter (21), like splitter (42) as imaging mirror, dispersion element is composite blazed grating (32), and grating constant is 600lp / mm, and detector is area array CCD (51), the system simulation structure diagram is attached Figure 13 shown.

[0099] Set the number n of spherical sub-mirrors of the image splitter to 5, for the wavelength range of 200-1000nm, the incident slit is 20μm, the sub-mirror of the image splitter is a spherical mirror with a focal length of 100mm, and the two-dimensional The deflection angle parameters are shown in Table 2.

[0100] The two-dimensional deflection angle parameter of image slicer in the third embodiment of table 3

[0101]

[0102] The spectral line diagram of embodiment three is attached Figure 14 As shown, only the center wavelength and two edge wavelengths of each band are used in the ZEMAX simulation, and each row from top to bottom represents 840–1000nm, 680–840...

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Abstract

The invention relates to spectroscopic instrument technology, and proposes a snap-shot grating spectrometer that can improve the wavelength range, resolution and light energy utilization rate of spectroscopic analysis instruments at the same time under the same detector area, and has good manufacturability and high cost performance structure. The technical solution adopted in the present invention is that the snapshot type grating spectrometer includes a light source, a collimating mirror, a grating, an imaging mirror and a detector, wherein the collimating mirror is an image splitter, and the image splitter is composed of a plurality of Spherical reflectors are arranged along the x direction and have two-dimensional deflection angles in the x and y directions. By changing the two-dimensional deflection angles, the angle of each group of outgoing parallel light can be adjusted; the image splitter receives the incident light emitted by the light source And output multiple groups of parallel light with different angles by reflection to the grating. The invention is mainly used in the design and manufacture of spectral instruments.

Description

technical field [0001] The invention relates to the technical field of spectroscopic instruments, in particular to a snapshot type grating spectrometer using an image slicer. Background technique [0002] Under the same detector size, improving the resolution, spectral range and diffraction efficiency simultaneously is the main goal pursued by the development of spectroscopic instruments. Conventional grating spectrometers use detectors to receive dispersion spectra in one-dimensional direction, and the resolution and spectral range of the obtained spectrograms are difficult to meet the measurement requirements at the same time. If a single blazed grating is used to cover a wide spectral range, the diffraction efficiency will inevitably be lost. In order to obtain a wide-band spectrum, the method of replacing multiple gratings or mechanical scanning is often used, which cannot meet the requirements of real-time measurement. [0003] Patent ZL98225262.5 proposes a spectrome...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J3/28G01J3/18G01J3/02
CPCG01J3/0205G01J3/1804G01J3/2803G01J3/2823
Inventor 张尹馨杨怀栋张震坤
Owner TIANJIN UNIV
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