CN110118602B

CN110118602B - Device for simultaneously acquiring broadband high-resolution spectral imaging information

Info

Publication number: CN110118602B
Application number: CN201910502845.3A
Authority: CN
Inventors: 李颖; 张振铎; 薛永祺; 刘瑀
Original assignee: Dalian Maritime University
Current assignee: Dalian Maritime University
Priority date: 2019-06-11
Filing date: 2019-06-11
Publication date: 2023-10-03
Anticipated expiration: 2039-06-11
Also published as: CN110118602A

Abstract

The application discloses a device for simultaneously acquiring broadband high-resolution spectrum imaging information, which specifically comprises an incident slit, a collimating mirror, a plane reflecting mirror, a diffraction grating, an imaging mirror and an area array photoelectric detector, wherein the plane reflecting mirror, the diffraction grating, the imaging mirror and the area array photoelectric detector are arranged in a layered manner, and the device is in a working state that: the radiation energy passing through the incidence slit of the spectrometer is firstly collimated by the collimating mirror, then reflected by the plane reflecting mirror, split by the diffraction grating, and finally focused and imaged on the photoelectric detector through the imaging mirror at the same time by the dispersion spectrum of different wave band ranges corresponding to each layer. The device can realize the simultaneous acquisition of wide spectrum band range, high spectrum resolution and imaging information. And the target with rapid optical characteristic change is subjected to spectral imaging detection, so that the multi-dimensional information is obtained at the same time, and the inversion and identification precision of the target can be remarkably improved.

Description

Device for simultaneously acquiring broadband high-resolution spectral imaging information

Technical Field

The application relates to the technical field of optical instruments, in particular to a device for simultaneously acquiring broadband high-resolution spectral imaging information.

Background

In the imaging spectrometer field, the conventional grating or prism mechanical scanning method can realize high spectrum resolution capability in a wider spectrum range, but the time series mechanical scanning type measurement mode cannot realize simultaneous acquisition of all spectrum information, and has lower repeated measurement precision and reliability in the long-time mechanical scanning measurement process. The spectrum information can be measured simultaneously by adopting a one-dimensional and two-dimensional area array detector mode without mechanical scanning, but the spectrum information is limited by the physical size and pixel resolution of the detector, and the requirements of high spectrum resolution, wide spectrum response range and wide imaging field of view can not be met simultaneously.

The two-dimensional multi-grating folding spectrum technology combines a plurality of gratings with different blazing angles and dispersion characteristics in an integrated way, and all the sub-gratings are orderly arranged according to a certain angle, so that diffraction spectrums of different sub-gratings all fall in almost the same diffraction opening angle and are focused on a detector by a bifocal reflector. The filter is designed in the light path to realize the filtering detection of different spectrum wavebands, and the simultaneous acquisition of the broadband high-resolution spectrum imaging information can be realized. But in order to realize the filtering detection of different spectral bands, a dual focal length reflecting mirror and a filter are utilized, so that the spatial resolution of spectral imaging is lower. There is also a structural style of spectrometer, that is, by adding a plane mirror in the optical path of the traditional spectrometer, a mode of switching different and whole plane mirrors is adopted to realize the detection of the broadband high-resolution spectrum imaging, but because the detection mode needs to be carried out in a time-sharing way, the broadband high-resolution spectrum imaging information cannot be obtained at the same time.

Disclosure of Invention

According to the problems existing in the prior art, the application discloses a device for simultaneously acquiring broadband high-resolution spectrum imaging information, which comprises the following specific structures:

the method comprises the steps of firstly collimating radiation energy passing through an incidence slit of a spectrometer by the collimating mirror, then reflecting the radiation energy by the plane reflecting mirror, splitting the radiation energy by the diffraction grating, and finally focusing and imaging dispersion spectrums corresponding to different wave band ranges of each layer on the area array photoelectric detector by the imaging mirror.

Further, the number of layers of the plane mirror is determined according to the reflection, the radiation spectrum range and the required detection spectrum resolution of the object to be detected.

Further, the plane mirrors of different layers are arranged along a direction parallel to the scribing direction of the diffraction grating, the plane mirrors of different layers respectively have different placement positions, azimuth angles and pitch angles, wherein the incident light direction is set to be a Z-axis direction, the scribing direction parallel to the diffraction grating is set to be an X-axis direction, the scribing direction perpendicular to the diffraction grating is set to be a Y-axis direction, the azimuth angle is a rotation angle around the X-axis, and the depression angle is a rotation angle around the Y-axis.

By adopting the technical scheme, the device for simultaneously acquiring the broadband high-resolution spectral imaging information provided by the application can realize the simultaneous acquisition of the broadband range, the high-spectral resolution and the imaging information. And the target with rapid optical characteristic change is subjected to spectral imaging detection, so that the multi-dimensional information is obtained at the same time, and the inversion and identification precision of the target can be remarkably improved. The application has lower cost and high reliability, and can be widely popularized and applied in high-performance imaging spectrometers.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.

FIG. 1 is a schematic top view of the apparatus of the present application;

FIG. 2 is a schematic side view of the apparatus of the present application;

FIG. 3 is a schematic diagram of the layered structure of the imaging spectrometer system of the present application showing the ideal imaging results.

1. The device comprises an entrance slit, a collimating mirror, a plane reflecting mirror, a diffraction grating, an imaging mirror and an area array photoelectric detector, wherein the entrance slit is formed by the steps of 2, the collimating mirror, 3, the plane reflecting mirror, 4, the diffraction grating, 5, and 6.

Detailed Description

In order to make the technical scheme and advantages of the present application more clear, the technical scheme in the embodiment of the present application is clearly and completely described below with reference to the accompanying drawings in the embodiment of the present application:

the device for simultaneously acquiring the broadband high-resolution spectrum imaging information as shown in fig. 1-3 specifically comprises an entrance slit 1, a collimating mirror 2, a plane reflecting mirror 3 arranged in a layered manner, a diffraction grating 4, an imaging mirror 5 and an area array photoelectric detector 6, and has the following working states: the radiation energy passing through the spectrometer entrance slit 1 is firstly collimated 2 by a collimating mirror, then reflected by a plane reflecting mirror 3, split by a diffraction grating 4, and finally focused and imaged on an area array photoelectric detector 6 through a dispersion spectrum of different wave band ranges corresponding to each layer by an imaging mirror 5.

Further, the number of layers of the plane mirror 3 is determined according to the reflection of the object to be measured, the spectral range of the radiation and the required spectral resolution of the detection.

Further, the plane mirrors 3 of different layers are arranged along a direction parallel to the scribing direction of the diffraction grating, and the plane mirrors 3 of different layers have different placement positions, azimuth angles and pitch angles, respectively, wherein the incident light direction is set to be a Z-axis direction, the scribing direction parallel to the diffraction grating is set to be an X-axis direction, the scribing direction perpendicular to the diffraction grating is set to be a Y-axis direction, the azimuth angle is a rotation angle around the X-axis, and the depression angle is a rotation angle around the Y-axis.

The layered emergent light rays passing through the plane reflector 3 have different incident angles to the grating, and the independent dispersion of the spectrum in a plurality of wave band ranges is realized simultaneously under the condition of ensuring that the size and the area of the grating are unchanged.

Each single-layer structure of the plane mirror 3 corresponds to a wave band range, and energy convergence imaging of multiple layers of corresponding different wave band ranges at different positions of the detector is ensured by utilizing different pitch angles among the multiple layers of plane mirrors.

The layered arrangement of the plane mirror 3 is specifically implemented by dividing the entire plane mirror into 10 layers (i.e. the plane mirror becomes a layered mirror), and the plane mirrors of different layers have different placement positions, azimuth angles and pitch angles, so that the light reflected by the layered mirror has different incident angles for the next optical element grating, and is incident on different positions of the grating 4, then on different positions of the imaging mirror 5, and finally on different positions of the area array photodetector 6.

Further, each layer of plane mirror in the plane mirror 3 has different placement positions, azimuth angles and pitch angles, so that the same diffraction grating is ensured to be corresponding.

The foregoing is only a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art, who is within the scope of the present application, should make equivalent substitutions or modifications according to the technical scheme of the present application and the inventive concept thereof, and should be covered by the scope of the present application.

Claims

1. The device is characterized by comprising an incidence slit, a collimating mirror, a plane reflecting mirror, a diffraction grating, an imaging mirror and an area array photoelectric detector, wherein the plane reflecting mirror, the diffraction grating, the imaging mirror and the area array photoelectric detector are arranged in a layering mode, radiation energy passing through the incidence slit of the spectrometer is firstly collimated by the collimating mirror, then reflected by the plane reflecting mirror, and finally is split by the diffraction grating, and finally, the dispersive spectrum of each layer corresponding to different wave band ranges is focused and imaged on the area array photoelectric detector.

2. The apparatus for simultaneous acquisition of broadband high-resolution spectral imaging information according to claim 1, further characterized by: and determining the number of layers of the plane reflecting mirror according to the reflection, the radiation spectrum range and the required detection spectrum resolution of the target to be detected.

3. The apparatus for simultaneous acquisition of broadband high-resolution spectral imaging information according to claim 1, further characterized by: the plane reflectors of different layers are arranged along the direction parallel to the scribing direction of the diffraction grating, the plane reflectors of different layers respectively have different placement positions, azimuth angles and pitch angles, wherein the direction of incident light rays is set to be the Z-axis direction, the direction parallel to the scribing direction of the diffraction grating is set to be the X-axis direction, the direction perpendicular to the scribing direction of the diffraction grating is set to be the Y-axis direction, the azimuth angle is a rotation angle around the X-axis, and the elevation angle is a rotation angle around the Y-axis.