CN209727262U - Broadband high-resolution spectral imaging information simultaneous acquisition device - Google Patents

Abstract

The utility model discloses a broadband high resolution spectral imaging information acquisition device simultaneously, specifically include plane mirror, diffraction grating, imaging mirror and the area array photoelectric detector of incident slit, collimating mirror, layering setting, under the operating condition: the radiation energy passing through the entrance slit of the spectrometer is firstly collimated by the collimating mirror, then reflected by the plane reflector, split by the diffraction grating and finally focused and imaged on the photoelectric detector by the imaging mirror at the same time by the dispersive spectrum of each layer corresponding to different wave band ranges. The device can realize the simultaneous acquisition of the wide spectrum wave band range, the high spectrum resolution and the imaging information. The target with rapid optical characteristic change is subjected to spectral imaging detection, multi-dimensional information is obtained at the same time, and the inversion and identification precision of the target can be remarkably improved.

Description

A device for simultaneous acquisition of broadband and high-resolution spectral imaging information

technical field

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

Background technique

In the field of imaging spectrometers, conventional grating or prism mechanical scanning methods can achieve high spectral resolution in a wide spectral range, but this time-series mechanical scanning measurement mode cannot achieve simultaneous acquisition of all spectral information, and in a long time Repeated measurement accuracy and reliability during mechanical scanning measurements are low. One-dimensional and two-dimensional area array detectors without mechanical scanning can realize simultaneous measurement of spectral information, but limited by the physical size of the detector and pixel resolution, it is impossible to simultaneously meet high spectral resolution, wide spectral response range and wide imaging field of view. field requirements.

Two-dimensional multi-grating folding spectroscopy technology integrates multiple gratings with different blaze angles and dispersion characteristics, and arranges each sub-grating in an orderly manner at a certain angle, so that the diffraction spectra of different sub-gratings fall at almost the same diffraction angle. Inside, it is focused onto the detector by a double focal length mirror. Filters are designed in the optical path to realize filter detection of different spectral bands, which can realize simultaneous acquisition of broadband and high-resolution spectral imaging information. However, in order to realize the filter detection of different spectral bands, the spatial resolution of spectral imaging is relatively low due to the use of dual focal length mirrors and filters. There is also a spectrometer structure type, that is, by adding a plane reflector to the optical path of the traditional spectrometer, and switching between different, whole plane reflectors, to achieve broadband high-resolution spectral imaging detection, but because this detection method requires a separate It is impossible to obtain broadband and high-resolution spectral imaging information at the same time.

Utility model content

According to the problems existing in the prior art, the utility model discloses a device for simultaneously acquiring broadband and high-resolution spectral imaging information. The specific structure includes:

The incident slit, collimating mirror, layered plane mirror, diffraction grating, imaging mirror and area array photodetector, the radiant energy passing through the incident slit of the spectrometer is first collimated by the collimating mirror, and then reflected by the plane mirror , After being split by the diffraction grating, the dispersion spectrum corresponding to each layer in different band ranges is focused and imaged on the area array photodetector at the same time through the imaging mirror.

Further, the number of layers of the plane reflector is determined according to the reflection of the target to be measured, the radiation spectral range and the spectral resolution required for detection.

Further, the planar reflectors of different layers are arranged along the direction parallel to the reticle lines of the diffraction grating, and the planar reflectors of different layers have different placement positions, azimuth angles and elevation angles, wherein the direction of the incident light is set as the Z-axis direction, parallel to The scribed direction of the diffraction grating is the X-axis direction, the direction perpendicular to the scribed direction of the diffraction grating is the Y-axis direction, the azimuth angle is the rotation angle around the X-axis, and the pitch angle axis is the rotation angle around the Y-axis.

Due to the adoption of the above technical solution, the utility model provides a device for simultaneously acquiring broadband and high-resolution spectral imaging information, which can realize simultaneous acquisition of wide spectral band range, high spectral resolution and imaging information. For targets with rapidly changing optical properties, spectral imaging detection can achieve simultaneous acquisition of multi-dimensional information, which can significantly improve the accuracy of inversion and recognition of targets. The utility model has lower cost and high reliability, and will be widely popularized and applied in high-performance imaging spectrometers.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments described in this application. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the top view structure schematic diagram of the utility model device;

Fig. 2 is the side view structural representation of the utility model device;

Fig. 3 is a schematic diagram of the ideal imaging result of the layered structure of the imaging spectrometer system of the present invention.

1. Incident slit, 2. Collimating mirror, 3. Plane mirror, 4. Diffraction grating, 5. Imaging mirror, 6. Area array photodetector.

Detailed ways

In order to make the technical solutions and advantages of the utility model clearer, the technical solutions in the embodiments of the utility model are clearly and completely described below in conjunction with the drawings in the embodiments of the utility model:

A device for simultaneously acquiring broadband and high-resolution spectral imaging information as shown in Figures 1-3, specifically including an incident slit 1, a collimating mirror 2, a layered plane mirror 3, a diffraction grating 4, and an imaging mirror 5 and the area array photodetector 6, the working conditions are as follows: the radiant energy passing through the incident slit 1 of the spectrometer is firstly collimated by the collimating mirror 2, then reflected by the plane mirror 3, split by the diffraction grating 4, and finally passes through the imaging mirror 5 The dispersion spectra corresponding to different wavelength ranges of each layer are focused and imaged on the area array photodetector 6 at the same time.

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

Further, the plane reflectors 3 of different layers are arranged along the direction parallel to the reticle lines of the diffraction grating, and the plane reflectors 3 of different layers have different placement positions, azimuth angles and elevation angles, wherein the direction of the incident light is set as the Z-axis direction , the direction parallel to the scribed direction of the diffraction grating is the X-axis direction, the direction perpendicular to the scribed direction of the diffraction grating is the Y-axis direction, the azimuth angle is the rotation angle around the X-axis, and the pitch angle axis is the rotation angle around the Y-axis.

Wherein the layered outgoing light rays passing through the plane reflector 3 have different incident angles to the grating, while ensuring that the size and area of the grating remain unchanged, the independent dispersion of spectra in multiple bands can be realized simultaneously.

Each single-layer structure of the plane mirror 3 corresponds to a waveband range, and the different pitch angles between the multilayer plane mirrors are used to ensure that the energy of multiple different waveband ranges corresponding to the multilayers is converged and imaged at different positions of the detector.

The layered setting of the plane mirror 3 is specifically adopted in the following manner, such as dividing the entire plane mirror into 10 layers (which becomes a layered mirror), and the plane mirrors of different layers have different placement positions, azimuths and pitches Angle, so the light reflected by the layered mirror has different incident angles for the next optical element grating, incident on different positions of the grating 4, then incident on different positions of the imaging mirror 5, and finally incident on the surface array Different positions of the photodetector 6.

Further, each layer of plane mirrors in the plane mirrors 3 has different placement positions, azimuth angles and elevation angles, ensuring that they correspond to the same diffraction grating.

The above is only a preferred embodiment of the utility model, but the scope of protection of the utility model is not limited thereto. The equivalent replacement or change of the new technical solution and the concept of the utility model shall be covered by the protection scope of the utility model.

Claims (3)

1. a kind of broadband high-resolution spectroscopy image-forming information while acquisition device, it is characterised in that including entrance slit, collimation Mirror, the plane mirror of layering setting, diffraction grating, imaging lens and face battle array photodetector, by entrance spectrometer slit Radiation energy first pass around collimating mirror collimation, then through plane mirror reflection, after diffraction grating is divided finally by imaging lens By the dispersion spectrum of every layer of corresponding different-waveband range while focal imaging is on the battle array photodetector of face.

2. a kind of broadband high-resolution spectroscopy image-forming information according to claim 1 while acquisition device, feature is also It is: plane mirror is determined according to the spectral resolution of the reflection of object to be measured, radiation spectrum range and required detection The number of plies.

3. a kind of broadband high-resolution spectroscopy image-forming information according to claim 1 while acquisition device, feature is also Be: wherein the plane mirror of different level is arranged along diffraction grating groove direction is parallel to, the plane mirror of different layers It is respectively provided with different placement locations, azimuth and pitch angle, wherein setting incident ray direction as Z-direction, is parallel to diffraction Grating ruling direction is X-direction, is Y direction perpendicular to diffraction grating delineation direction, and azimuth is to turn about the X axis angle, Pitch angle axis is around Y-axis rotational angle.