CN109556718B - Method for realizing coded aperture dispersion spectrum calibration based on DMD single-element gating - Google Patents
Method for realizing coded aperture dispersion spectrum calibration based on DMD single-element gating Download PDFInfo
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- 230000008569 process Effects 0.000 description 3
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- 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
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Abstract
The embodiment of the invention discloses a method for realizing coded aperture dispersion spectrum calibration based on DMD single-element gating. The method utilizes the characteristic that DMD can carry out pixel level gating at any position in a two-dimensional plane, parallel light beams in a narrow spectrum section pass through a DMD gating mirror and are subjected to dispersion imaging on a detector by a dispersion element, the position relation between each wavelength spectrum after dispersion by the dispersion element and a detector pixel is inverted after linear fitting in a later period by recording the response position of the light beams in the discrete narrow spectrum section on the detector, and DMD mirror elements in corresponding positions of different fields are gated to carry out spectrum calibration, so that the full-field dispersion spectrum calibration of the system is completed. The method effectively solves the problem that the existing calibration method is not suitable for calibrating the dispersive spectrometer with the coded aperture.
Description
Technical Field
The invention relates to the technical field of coded imaging, in particular to a method for realizing coded aperture dispersion spectrum calibration based on DMD single-mirror gating.
Background
Dispersive spectrometers suffer from dispersion non-linearity and line bending due to inherent problems with dispersive elements such as prisms or gratings. These phenomena directly affect the application of spectral image data, and therefore, the central wavelength and bandwidth variation of each spectral channel need to be monitored before use, so as to ensure the accuracy of spectral calibration.
The conventional spectral calibration method for a spectral instrument includes a spectral line lamp calibration method and a monochromator calibration method. The spectral line lamp calibration method utilizes the emission spectral line of a mercury lamp or a sodium lamp, can only realize the spectral calibration of a linear dispersion instrument with higher spectral resolution, and cannot realize the calibration of spectral bandwidth. The monochromator calibration method continuously outputs monochromatic collimated light, can simultaneously realize wavelength and bandwidth calibration in a wide spectral range, and has a good calibration effect on the traditional slit type dispersive spectrometer, so that the monochromator calibration method is widely used. However, after the coded aperture is used for replacing the conventional slit, the spectrum aliasing exists in the two-dimensional space of the dispersive spectrometer based on the coded aperture, the conventional monochromator calibration method is difficult to meet the calibration precision requirement, and the post data processing is complex.
Therefore, for the problem that the existing spectrum calibration method is not suitable for calibrating the dispersive spectrometer with coded aperture, it is necessary to provide a method for calibrating the dispersive spectrometer with coded aperture by using the single-element gating of a Digital Micromirror Device (DMD) with high precision.
Disclosure of Invention
Aiming at the problem that the existing spectrum calibration method is not suitable for a coded aperture dispersion spectrometer, the embodiment of the invention provides a method for realizing coded aperture dispersion spectrum calibration by using single-lens gating of a Digital Micromirror Device (DMD for short) with high precision. The method effectively solves the problem that the existing calibration method is not suitable for calibrating the dispersive spectrometer with the coded aperture.
The specific scheme of the method for realizing the calibration of the coded aperture dispersion spectrum based on the DMD single-element gating is as follows: a method for realizing the calibration of the coded aperture dispersion spectrum based on the DMD single-element gating comprises the following steps of S1: installing a monochromator with a collimator in front of a coded aperture dispersion spectrometer based on a DMD (digital micromirror device), so that parallel light beams emitted by the monochromator are perpendicular to the surface of a gating mirror element of the DMD, and the wavelength interval of monochromatic light of the monochromator is delta lambda; step S2: loading a coded image on the DMD, wherein the coded image can control the DMD to realize single-lens gating of a specific view field position; step S3: switching on a light source of the monochromator, selecting the wavelength of the calibrated monochromatic light, and controlling a detector to collect a response image; step S4: sequentially switching the light-passing spectral bands Delta lambda 1, Delta lambda 2, … and Delta lambda n of the monochrometer, wherein n is a natural number greater than 1; step S5: repeating the steps S3 and S4 until the response position S on the detector after the narrow-band spectrum dispersion of the specific field-of-view position of the DMD-based coded aperture dispersion spectrometer is completed1,S2,…,SnCounting; step S6: carrying out Gaussian fitting on the response position of each collected narrow-band spectrum on the detector after dispersion, thereby completing the spectrum calibration of the coded aperture dispersion spectrometer based on the DMD at the specific field position; step S7: the steps S3 to S6 are repeated,the calibration of other dispersion spectrums at any field position is realized, and then the combination of the calibrated field positions is selected, so that the full-field spectrum calibration of the DMD-based coded aperture dispersion spectrometer is completed.
Preferably, the specific value of n is determined according to the precision of the DMD based coded aperture dispersion spectrometer.
Preferably, the monochromatic light wavelength interval Δ λ of the monochromator corresponds to the spectral calibration accuracy of the DMD-based coded aperture dispersion spectrometer.
Preferably, said spectral range Δ λ1，Δλ2,…,ΔλnCovering the working spectrum section of the DMD-based coded aperture dispersion spectrometer.
Preferably, the method further comprises the step of: each micro-mirror element in the DMD is turned over +/-alpha degrees along the diagonal line of the micro-mirror element, so that incident light signals can be reflected to two different directions in an optical path, and gating of light is achieved.
Preferably, the size of the mirror element of the DMD in the DMD-based coded aperture dispersion spectrometer is matched with the size of the image of the detector pixel after passing through the subsequent optical system.
Preferably, the DMD is a digital micromirror device.
Preferably, the method is applied to fields including calibration of dispersive spectrum for a single field position and calibration of dispersive spectrum for multiple field positions simultaneously.
Preferably, the calibration of the dispersion spectrum comprises calibration of the central wavelength of each field of view and calibration of the central bandwidth of each field of view position.
According to the technical scheme, the embodiment of the invention has the following advantages:
the method for realizing the calibration of the coded aperture dispersion spectrum based on the DMD single-mirror gating utilizes the characteristic that the DMD can carry out pixel-level gating at any position in a two-dimensional plane, when a narrow-spectrum-band parallel light beam passes through the DMD gating mirror and is subjected to dispersion imaging by a dispersion element to a detector, the calibration of the full-view field dispersion spectrum of the system can be finished by recording the response position of the discrete narrow-spectrum-band light beam on the detector, reversing the position relation between each wavelength spectrum dispersed by the dispersion element and the detector pixel through later-stage linear fitting and gating DMD mirror elements at corresponding positions of different view fields to carry out the calibration of the spectrum. Further, the method for realizing the calibration of the chromatic dispersion spectrum of the coded aperture based on the DMD single-element gating provided by the embodiment of the present invention solves the difficult problems that the traditional monochromator calibration method cannot meet the calibration precision requirement and the post-data processing is complicated due to the spectrum aliasing existing in the two-dimensional space after the coded aperture based chromatic dispersion spectrum replaces the traditional slit with the coded aperture.
Drawings
Fig. 1 is a schematic flowchart of a process for implementing calibration of a coded aperture dispersion spectrum based on DMD single-element gating according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a DMD single-element gating-based coded aperture dispersion spectrum calibration in an embodiment of the present invention;
FIG. 3 is a schematic diagram of an ideal corresponding relationship between a DMD micromirror element and a detector pixel after passing through a subsequent system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a spectral calibration curve after gaussian fitting of the calibration wavelength and the response field of view provided in the embodiment of the present invention.
Description of reference numerals:
1. DMD 2, dispersion imaging system 3, and detector
4. Control computer 5, light source 6, monochromator
7. Collimator 9, gating mirror element
12. When the spectrum of the monochromator is delta lambda1Time-corresponding detector response pixel position S1
13. When the spectrum of the monochromator is delta lambdanTime detector response pixel position Sn
14. Coded aperture dispersion spectrometer based on DMD
Detailed Description
In order to make the technical solutions of the present invention better understood, 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.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As shown in fig. 1, a schematic flow chart for implementing calibration of a coded aperture dispersion spectrum based on DMD single-element gating according to an embodiment of the present invention is provided. The method for realizing the calibration of the coded aperture dispersion spectrum based on the DMD single-element gating comprises seven steps, and the specific content of each step is as follows.
Step S1: installing a monochromator with a collimator in front of a coded aperture dispersion spectrometer based on a DMD (digital micromirror device), so that parallel light beams emitted by the monochromator are perpendicular to the surface of a gating mirror element of the DMD, and the wavelength interval of monochromatic light of the monochromator is delta lambda. And the monochromatic light wavelength interval delta lambda of the monochromator corresponds to the spectrum calibration precision of the DMD-based coded aperture dispersion spectrometer. The DMD is a Digital micro-mirror Device (Digital micro-mirror Device), has a flexible and rapid coding mode, and can realize pixel-level gating at any position in a two-dimensional plane.
Step S2: loading an encoded image on the DMD, the encoded image being operable to control the DMD to implement single-element gating for a particular field-of-view position. The size of a mirror element of a DMD in the coded aperture dispersion spectrometer based on the DMD is matched with the pixel of a detector after passing through a subsequent optical system.
Step S3: and switching on a light source of the monochromator, selecting the wavelength of the calibrated monochromatic light, and controlling a detector to collect a response image.
Step S4: and sequentially switching the light passing spectral bands delta lambda 1, delta lambda 2, … and delta lambda n of the monochromator to be natural numbers which are larger than 1. The specific value of n is determined according to the precision of the DMD-based coded aperture dispersion spectrometer. Spectral range delta lambda1，Δλ2,…,ΔλnCovering the operating spectrum of a DMD based coded aperture dispersion spectrometer.
Step S5: repeating the steps S3 and S4 until the response position S on the detector after the narrow-band spectrum dispersion of the specific field-of-view position of the DMD-based coded aperture dispersion spectrometer is completed1,S2,…,SnAnd (6) counting.
Step S6: and performing Gaussian fitting on the response position of the acquired narrow-band spectrum on the detector after dispersion, thereby completing the spectrum calibration of the DMD-based coded aperture dispersion spectrometer at the specific field position.
Step S7: and repeating the steps S3 to S6 to realize the calibration of the dispersion spectrum of other arbitrary field positions, and then selecting the combination of the calibrated field positions, thereby completing the full-field spectrum calibration of the DMD-based coded aperture dispersion spectrometer.
The application field of the method for realizing the calibration of the coded aperture dispersion spectrum based on the DMD single-element gating comprises the calibration of the dispersion spectrum at a single field position and the calibration of the dispersion spectrum at a plurality of field positions. The calibration of the dispersion spectrum comprises the calibration of the central wavelength of each field of view and the calibration of the central bandwidth of each field of view.
In a preferred embodiment, the method for implementing the calibration of the coded aperture dispersion spectrum based on the DMD single-element gating further includes the steps of: each micro-mirror element in the DMD is turned over +/-alpha degrees along the diagonal line of the micro-mirror element, so that incident light signals can be reflected to two different directions in an optical path, and gating of light is achieved.
Referring to fig. 2, a schematic structural diagram for implementing calibration of a coded aperture dispersion spectrum based on DMD single-element gating according to an embodiment of the present invention is provided. The specific operation of the process steps described in fig. 1 is as follows, with reference to the specific structure of fig. 2.
A monochromator 6 with collimator 7 is mounted in front of a DMD based coded aperture dispersion spectrometer 14. The DMD 1 is loaded with a coded image which can control the DMD to realize the single-lens gating 9 with a specific view field, and the light source 5 of the monochromator 6 is switched on. Selecting the wavelength of the calibrated monochromatic light, controlling the computer 4 to control the detector 3 to collect the response image, controlling the computer 4 to record the response pixel position S of the detector 3, and sequentially switching the pass spectrum band Delta lambda of the monochromator1，Δλ2,…,ΔλnAnd the value of n can be reasonably selected according to the spectral calibration precision. Repeating the steps to complete the response position S on the detector after the narrow-band spectrum dispersion of the specific field position of the coded aperture dispersion spectrometer 14 based on the DMD112，S2，…SnAnd 13, statistics. And performing Gaussian fitting on the response position of the acquired narrow-band spectrum on the detector 3 after dispersion, and thus completing the spectrum calibration of the dispersive spectrometer at the specific field position. Similarly, the calibration of the dispersion spectrum at any other field position can be realized, and the full-field dispersion spectrum calibration of the dispersion spectrometer can be completed by reasonably selecting the field position combination.
With continued reference to fig. 3, a schematic diagram of an ideal corresponding relationship between the DMD micromirror element and the detector pixel after passing through a subsequent system according to an embodiment of the present invention is provided. The DMD 1 and the detector 3 are connected to a control computer 4. The control computer 4 sends a coding signal to the DMD 1, so that the DMD 1 is loaded with a coding image which can control the DMD to realize single-element gating of a specific view field position. The control computer 4 simultaneously sends an image acquisition signal to the detector 3 and controls the detector 3 to acquire images. A dispersive imaging system 2 is arranged between the DMD 1 and the detector 3. As can be seen from fig. 3, at this time, the positional relationship between the DMD micromirror element and the detector pixel has a strict correspondence.
Referring to fig. 4, a schematic diagram of a spectral calibration curve after gaussian fitting of the calibration wavelength and the response field of view provided in the embodiment of the present invention is shown. As can be seen from fig. 4, different calibration wavelengths change at different field positions, and the change trend of different field positions is the same as that of different calibration wavelengths.
The method for realizing the calibration of the coded aperture dispersion spectrum based on the DMD single-mirror gating utilizes the characteristic that the DMD can carry out pixel-level gating at any position in a two-dimensional plane, when a narrow-spectrum-band parallel light beam passes through the DMD gating mirror and is subjected to dispersion imaging by a dispersion element to a detector, the calibration of the full-view field dispersion spectrum of the system can be finished by recording the response position of the discrete narrow-spectrum-band light beam on the detector, reversing the position relation between each wavelength spectrum dispersed by the dispersion element and the detector pixel through later-stage linear fitting and gating DMD mirror elements at corresponding positions of different view fields to carry out the calibration of the spectrum.
The method for realizing the calibration of the chromatic dispersion spectrum of the coded aperture based on the DMD single-lens gating solves the problems that the traditional monochrometer calibration method is difficult to meet the calibration precision requirement and the later data processing is complex due to the spectrum aliasing in a two-dimensional space after the traditional slit is replaced by the coded aperture of the chromatic dispersion spectrometer based on the coded aperture.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. A method for realizing the calibration of a coded aperture dispersion spectrum based on the gating of a DMD single mirror element is characterized by comprising the following steps:
step S1: installing a monochromator with a collimator in front of a coded aperture dispersion spectrometer based on a DMD (digital micromirror device), so that parallel light beams emitted by the monochromator are perpendicular to the surface of a gating mirror element of the DMD, and the wavelength interval of monochromatic light of the monochromator is delta lambda;
step S2: loading a coded image on the DMD, wherein the coded image can control the DMD to realize single-lens gating of a specific view field position;
step S3: switching on a light source of the monochromator, selecting the wavelength of the calibrated monochromatic light, and controlling a detector to collect a response image;
step S4: sequentially switching the light-passing spectral bands Delta lambda 1, Delta lambda 2, … and Delta lambda n of the monochrometer, wherein n is a natural number greater than 1;
step S5: repeating the steps S3 and S4 until the response position S on the detector after the narrow-band spectrum dispersion of the specific field-of-view position of the DMD-based coded aperture dispersion spectrometer is completed1,S2,…,SnCounting;
step S6: carrying out Gaussian fitting on the response position of each collected narrow-band spectrum on the detector after dispersion, thereby completing the spectrum calibration of the coded aperture dispersion spectrometer based on the DMD at the specific field position;
step S7: and repeating the steps S3 to S6 to realize the calibration of the dispersion spectrum of other arbitrary field positions, and then selecting the combination of the calibrated field positions, thereby completing the full-field spectrum calibration of the DMD-based coded aperture dispersion spectrometer.
2. The method according to claim 1, wherein the specific value of n is determined according to the accuracy of the DMD based coded aperture dispersion spectrometer.
3. The method according to claim 1, wherein a monochromatic light wavelength interval Δ λ of the monochromator corresponds to a spectral calibration accuracy of the DMD-based coded aperture dispersion spectrometer.
4. The method according to claim 1, wherein the spectral range Δ λ is a spectral range obtained by performing DMD single-element gating to achieve spectral calibration of the coded aperture dispersion1，Δλ2,…,ΔλnCovering the working spectrum section of the DMD-based coded aperture dispersion spectrometer.
5. The method for realizing the calibration of the coded aperture dispersion spectrum based on the gating of the DMD single mirror element as claimed in claim 1, wherein the method further comprises the steps of: each micro-mirror element in the DMD is turned over +/-alpha degrees along the diagonal line of the micro-mirror element, so that incident light signals can be reflected to two different directions in an optical path, and gating of light is achieved.
6. The method according to claim 1, wherein the size of the mirror elements of the DMD in the DMD-based coded aperture dispersion spectrometer after passing through a subsequent optical system matches the size of the image on the detector with the detector pixels.
7. The method according to claim 1, wherein the DMD is a digital micromirror device.
8. The method according to claim 1, wherein the method is applied to fields including calibration of dispersion spectrum for a single field of view and calibration of dispersion spectrum for a plurality of field of view simultaneously.
9. The method according to claim 8, wherein the calibration of the dispersion spectrum comprises calibration of the center wavelength of each field of view and calibration of the center bandwidth of each field of view position.
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| CN104359555A (en) * | 2014-10-16 | 2015-02-18 | 中国科学院上海技术物理研究所 | Portable hyperspectral reconstitution device based on digital micro reflector |
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