CN110567581A - DMD-based multi-target imaging spectrum system and method - Google Patents
DMD-based multi-target imaging spectrum system and method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2823—Imaging spectrometer
Abstract
A multi-target imaging spectrum system and method based on DMD, the system includes DMD, controller, imaging channel and spectrum channel connected with DMD; the controller is used for controlling all the micro-mirror units of the DMD to project the acquired optical information to the imaging channel when the micro-mirror units are at the first position; the imaging channel is used for imaging and acquiring more than two target points comprising a first part and a second part; the controller is also used for firstly controlling the DMD and the micro mirror unit corresponding to the first part to rotate to a second position and projecting light to the spectrum channel, and spectrum information of the first part is obtained through the spectrum channel; then controlling the DMD and the micro mirror unit corresponding to the first part to rotate to a first position; and finally, controlling the DMD and the micro mirror unit corresponding to the second part to rotate to a second position and projecting light to the spectrum channel, and acquiring the spectrum information of the second part by the spectrum channel. The invention fuses the spectral information of the first part and the spectral information of the second part to form target spectral information.
Description
Technical Field
The invention relates to the technical field of celestial body imaging spectrum, in particular to a DMD-based multi-target imaging spectrum system and method.
Background
The astronomy research of large field of view and large sample astronomy in the field of astronomy and astronomy physics needs a large amount of spectral data of celestial bodies as a basis, and the multi-target spectrometer serving as an instrument with the highest celestial body spectrum acquisition efficiency at present can well solve the problem.
with the development of micro-optoelectronic Device technology, multi-target spectroscopy technology is beginning to develop towards miniaturization and intellectualization, and a multi-target imaging spectrometer using a DMD (Digital Micromirror Device) as a multi-target selection Device appears. The DMD chip is usually only matchbox sized, but can arrange as many as 80-100 ten thousand facets of small mirrors, which are independent from each other, and each small mirror can be freely switched at a very high switching frequency between positive and negative two extreme positions. The DMD technology abandons the optical convergence concept in the traditional sense, can set the effective area of the focal plane at will, is very convenient to adjust, is easy to realize miniaturization, and has good control on cost after the manufacturing technology is gradually mature. The multi-target imaging spectrometer developed based on the DMD by means of the programmable control function of the DMD can realize simultaneous detection of multiple targets in a two-dimensional field range.
The DMD-based multi-target imaging spectrometer consists of an imaging channel and a spectrum channel, and switching between the two channels is realized based on the turning function of a micro-mirror unit. The detection of multiple targets often encounters the situation that two adjacent targets are very close to each other, and if the targets are directly led into a spectrum channel for light splitting without processing, the spectrums of the two targets are overlapped, so that the respective spectrums cannot be acquired.
Disclosure of Invention
in view of the above, there is a need to provide a DMD-based multi-target imaging spectroscopy system that solves the problem of the conventional multi-target spectrometer that takes a lot of time to solve the spectral overlap problem.
A multi-target imaging spectrum system based on a DMD (digital micromirror device) comprises the DMD, a controller connected with the DMD, an imaging channel and a spectrum channel; the DMD is respectively arranged at intervals with the imaging channel and the spectrum channel; the controller is used for controlling all the micro-mirror units of the DMD to project the acquired optical information to the imaging channel when the micro-mirror units are at the first position; the imaging channel is used for imaging the optical information and acquiring more than two target points, and the more than two target points comprise a first part and a second part; the controller is further used for firstly controlling the DMD and the micro mirror unit corresponding to the first part to rotate to a second position and projecting light to the spectrum channel, and the spectrum channel acquires spectrum information of the first part; then controlling the DMD and a micromirror unit corresponding to the first part to rotate to a first position; and finally, controlling the DMD and the micro mirror unit corresponding to the second part to rotate to a second position and projecting light to the spectrum channel, and acquiring the spectrum information of the second part by the spectrum channel.
The invention also provides a DMD-based multi-target imaging spectrum method, which comprises the following steps of:
controlling all the micro-mirror units of the DMD to project the acquired optical information to an imaging channel when the micro-mirror units are at the first position;
The imaging channel images the optical information and acquires more than two target points, wherein the more than two target points comprise a first part and a second part;
Controlling the DMD and a micro mirror unit corresponding to the first part to rotate to a second position and projecting light to a spectrum channel, and acquiring spectrum information of the first part by the spectrum channel;
Controlling the DMD to rotate to a first position corresponding to the first part;
and controlling the DMD to rotate to a second position corresponding to the micro-mirror unit of the second part and projecting light to the spectrum channel, and acquiring spectrum information of the second part by the spectrum channel.
The invention utilizes the characteristic that the micro-mirror unit of the DMD can be rapidly switched between the first position and the second position to guide the adjacent target into the spectrum channel for light splitting in a fractional manner, thereby effectively solving the problem of spectrum overlapping. Due to the fact that the switching speed of the DMD is extremely high, the advantage of observation efficiency is obvious compared with that of a traditional multi-target spectrometer.
Drawings
FIG. 1 is a schematic structural diagram of a DMD-based multi-target imaging spectroscopy system according to the present invention;
FIG. 2 is a schematic diagram of an application scenario of the DMD-based multi-target imaging spectroscopy system shown in FIG. 1;
FIG. 3 is an image acquired by the imaging channel shown in FIG. 2;
FIG. 4 is a spectral diagram of the spectral channel acquired when the target point acquired by the imaging channel shown in FIG. 1 is simultaneously projected to the spectral channel at one time;
FIG. 5 is a first spectral diagram and a second spectral diagram obtained by the spectral channel when the target point obtained by the imaging channel is projected to the spectral channel twice;
fig. 6 is a flowchart of a multi-target imaging spectroscopy method based on a DMD according to the present invention.
Detailed Description
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a DMD-based multi-target imaging spectroscopy system 100 according to the present invention includes a DMD, a controller 10 connected to the DMD, an imaging channel 20, and a spectroscopy channel 30; the DMD is respectively arranged at intervals with the imaging channel 20 and the spectrum channel 30; the controller 10 is configured to control all the micromirror units of the DMD to project the acquired optical information to the imaging channel 20 at a first position; the imaging channel 20 is configured to image the optical information and acquire two or more target points, where the two or more target points include a first portion and a second portion; the controller 10 is further configured to control the DMD to rotate to a second position with respect to the micromirror unit corresponding to the first portion, and project light to the spectrum channel 30, so that the spectrum channel 30 obtains spectrum information of the first portion; then controlling the DMD and the micro mirror unit corresponding to the first part to rotate to a first position; and finally, controlling the DMD and the micro mirror unit corresponding to the second part to rotate to a second position and projecting light to the spectrum channel, and acquiring the spectrum information of the second part by the spectrum channel.
in this embodiment, the controller 10 is further configured to fuse the spectral information of the first portion and the spectral information of the second portion to form target spectral information. Image Fusion (Image Fusion) refers to that Image data collected by a multi-source channel and related to the same target is subjected to Image processing, computer technology and the like, beneficial information in respective channels is extracted to the maximum extent, and finally high-quality images are formed through comprehensive Fusion, so that the utilization rate of Image information is improved, the computer interpretation precision and reliability are improved, the spatial resolution and the spectral resolution of an original Image are improved, and monitoring is facilitated.
in the present embodiment, the imaging channel 20 and the spectral channel 30 are located on the left and right sides of the DMD; the first position is an extreme position to the left of the micromirror unit position and the second position is an extreme position to the right of the micromirror unit position.
The imaging channel may include a focusing element, which may include a combination of convex and concave lenses, and a photodetector array for placement in a focal plane and for measuring light intensity at each wavelength image point. The detector array may be a CCD array or other kind of photo detector array.
The spectral channels may be comprised of an entrance slit, a collimating element, a dispersive element, a focusing element, and a detector array set. The electromagnetic radiation from the radiation source is separated by a dispersive element into the desired wavelength or wavelength region and intensity measurements are taken at selected wavelengths (or scanned over a band of wavelengths). The entrance slit is used for forming an object point of a spectrometer imaging system under the irradiation of incident light. The collimating element is used to make the light emitted from the slit become parallel light. The collimating element can be a separate lens, mirror, or a concave grating integrated directly onto the dispersive element, such as in a concave grating spectrometer. Dispersive elements are used to spatially disperse an optical signal into a plurality of beams, typically using a grating, according to wavelength. The focusing element is used for focusing the dispersed light beam to form a series of images of the incident slits on a focal plane, wherein each image point corresponds to a specific wavelength. The detector array is arranged to be placed at the focal plane and to measure the light intensity at each wavelength image point. The detector array may be a CCD array or other kind of photo detector array. In other embodiments, the spectral channels may have other configurations.
In this embodiment, the number of target points included in the first portion is greater than the number of target points included in the second portion.
More specifically, the number of target points included in the second portion is one or more; the second portion includes one number of target points.
Further, the multi-target imaging spectroscopic system based on the DMD further includes a front telescope device 40 for acquiring optical information of the celestial body and projecting the optical information to the DMD.
Fig. 2 is a schematic view of an application scenario of the DMD-based multi-target imaging spectroscopy system 100 shown in fig. 1. In an initial state, all the micro mirror units of the DMD are turned over to the extreme position at the leftmost side, all optical information in the two-dimensional field passes through the front-end telescopic system, then is reflected into the imaging channel at the left side by all the micro mirror units of the DMD to be optically imaged, and then a valuable target point (namely an imaging point of a target celestial body) is found through image processing; and then the controller overturns the micromirror units corresponding to the target points to the rightmost limit positions twice, and introduces the target points to the spectral channel twice for spectral analysis. Since the turning speed of the micromirror unit is very fast, the system is equivalent to acquiring the image information and the spectrum information of the target point at the same time.
as shown in fig. 3, which is a schematic diagram of the first stage of the DMD based multi-target imaging spectroscopy system 100 shown in fig. 1 in one specific example application, there are seven target points, numbered A, B, C, D, E, F, G, in total, within the front telescopic system field of view, where the two targets, numbered E and F, are very close in both dispersive and non-dispersive directions of the spectra, and if the spectra of the two targets are directly split, they will be overlapped. Because the target area, the imaging channel detector pixel, the DMD micro-mirror unit and the spectral channel detector pixel of the multi-target imaging spectral system based on the DMD have strict corresponding relations, the problem of spectral overlapping can be solved by introducing adjacent target points in a fractional manner by utilizing the characteristic. Because the switching speed of the micromirror unit is extremely high and can reach millisecond order, the multi-target imaging spectrum system based on the DMD can accurately acquire respective spectrums of adjacent targets E and F at nearly the same time, compared with the traditional solid-state slit template or optical fiber type multi-target spectrometer, a lot of time is needed to solve the problem of spectrum overlapping, and therefore the method has obvious advantages.
According to the optical characteristics, the visual field of the DMD imaging spectrometer, the DMD micro-mirror unit, the imaging channel detector pixel and the spectrum channel detector pixel have strict corresponding relation. As shown in fig. 2, in the initial state, all the micromirror units of the DMD are adjusted to point to the imaging channel, and the imaging channel detector can record the image information of the target field of view, and find out the valuable observed target through image processing, which is labeled A, B, C, D, E, F, G, because the two targets E and F are very close to each other, their spectra are directly split and added together. To solve this problem, we first adjust the micromirror units corresponding to the six target points A, B, C, D, E, G to point to the spectral channel, split the six target points, and adjust the micromirror units back to the position pointing to the image channel after obtaining their spectra. And then integrating the micro mirror unit corresponding to the F into a pointing spectrum channel, splitting the light of the target F, obtaining the spectrum of the target F, fusing the spectrum with A, B, C, D, E, G, and coupling the fused spectrum with the image obtained by the imaging channel to obtain all map information of the target field of view.
The invention aims to solve the problem that the traditional multi-target spectrometer needs to spend a large amount of time on solving the problem of spectrum overlapping. By utilizing the characteristic that the micro-mirror unit of the DMD can be rapidly switched between a positive limit position and a negative limit position (namely a first position and a second position), an adjacent target is guided into a spectrum channel for splitting light in a sub-division manner, and the problem of spectrum overlapping is effectively solved. Due to the fact that the switching speed of the DMD is extremely high, the advantage of observation efficiency is obvious compared with that of a traditional multi-target spectrometer.
As shown in fig. 5, the present invention further provides a DMD-based multi-target imaging spectroscopy method, which comprises the following steps:
S1: controlling all the micro-mirror units of the DMD to project the acquired optical information to an imaging channel when the micro-mirror units are at the first position;
s2: the imaging channel images the optical information and acquires more than two target points, wherein the more than two target points comprise a first part and a second part;
s3: controlling the DMD and a micro mirror unit corresponding to the first part to rotate to a second position and project the second position to a spectrum channel, and acquiring spectrum information of the first part by the spectrum channel;
S4: controlling the DMD to rotate to a first position corresponding to the first part;
s5: and controlling the DMD and the micro mirror unit corresponding to the second part to rotate to a second position and project the second position to the spectrum channel, and acquiring the spectrum information of the second part by the spectrum channel.
The DMD-based multi-target imaging spectrum method further comprises a step S6 of fusing the spectral information of the first part and the spectral information of the second part to form target spectral information.
In the DMD-based multi-target imaging spectroscopy method, the number of target points contained in the first part is larger than that contained in the second part; more specifically, the number of target points included in the second portion is one or more; the second portion includes one number of target points.
The above-mentioned embodiments only express one or several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A multi-target imaging spectrum system based on a DMD (digital micromirror device) comprises the DMD, a controller connected with the DMD, an imaging channel and a spectrum channel; the DMD is respectively arranged at intervals with the imaging channel and the spectrum channel; the controller is used for controlling all the micro-mirror units of the DMD to project the acquired optical information to the imaging channel when the micro-mirror units are at the first position; the imaging channel is used for imaging the optical information and acquiring more than two target points, and the more than two target points comprise a first part and a second part; the controller is further used for firstly controlling the DMD and the micro mirror unit corresponding to the first part to rotate to a second position and projecting light to the spectrum channel, and the spectrum channel acquires spectrum information of the first part; then controlling the DMD and the micro mirror unit corresponding to the first part to rotate to a first position; and finally, controlling the DMD and the micro mirror unit corresponding to the second part to rotate to a second position and projecting light to the spectrum channel, and acquiring the spectrum information of the second part by the spectrum channel.
2. the DMD-based multi-target imaging spectroscopy system of claim 1, wherein the controller is further configured to fuse the spectral information of the first portion and the spectral information of the second portion to form target spectral information.
3. the DMD-based multi-target imaging spectroscopy system of claim 2, wherein the imaging channels and the spectral channels are located on the left and right sides of the DMD.
4. The DMD-based multi-target imaging spectroscopy system of claim 3, wherein the first position is an extreme position to the left of a micromirror unit position and the second position is an extreme position to the right of a micromirror unit position.
5. the DMD-based multi-target imaging spectroscopy system of claim 1, wherein the first portion comprises a greater number of target points than the second portion.
6. The DMD-based multi-target imaging spectroscopy system of claim 5, wherein the second portion comprises more than one number of target points; the second portion includes one number of target points.
7. a multi-target imaging spectrum method based on a DMD is characterized by comprising the following steps:
Controlling all the micro-mirror units of the DMD to project the acquired optical information to an imaging channel when the micro-mirror units are at the first position;
The imaging channel images the optical information and acquires more than two target points, wherein the more than two target points comprise a first part and a second part;
Controlling the DMD and a micro mirror unit corresponding to the first part to rotate to a second position and projecting light to a spectrum channel, and acquiring spectrum information of the first part by the spectrum channel;
Controlling the DMD to rotate to a first position corresponding to the first part;
And controlling the DMD to rotate to a second position corresponding to the micro-mirror unit of the second part and projecting light to the spectrum channel, and acquiring spectrum information of the second part by the spectrum channel.
8. The DMD-based multi-target imaging spectroscopy method of claim 7, further comprising fusing the spectral information of the first portion and the spectral information of the second portion to form target spectral information.
9. The reduced-obscuration ratio secondary mirror assembly of claim 7 wherein the first portion contains a greater number of target points than the second portion.
10. the DMD-based multi-target imaging spectroscopy method of claim 9, wherein the second portion comprises more than one target point; the second portion includes one number of target points.
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| CN201910918873.3A CN110567581B (en) | 2019-09-26 | 2019-09-26 | Method for detecting similar targets by multi-target imaging spectrum system based on DMD |
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| CN112268519A (en) * | 2020-09-27 | 2021-01-26 | 西北工业大学宁波研究院 | Spectral imaging target detection method and system based on DMD |
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| CN112525345A (en) | 2021-03-19 |
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