CN107655570A - A kind of synchronous mechanically moving template type Hadamard spectrometers - Google Patents
A kind of synchronous mechanically moving template type Hadamard spectrometers Download PDFInfo
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- CN107655570A CN107655570A CN201710818534.9A CN201710818534A CN107655570A CN 107655570 A CN107655570 A CN 107655570A CN 201710818534 A CN201710818534 A CN 201710818534A CN 107655570 A CN107655570 A CN 107655570A
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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
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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
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- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
- G01J3/0229—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using masks, aperture plates, spatial light modulators or spatial filters, e.g. reflective filters
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Abstract
The present invention relates to a kind of synchronous mechanically moving template type Hadamard spectrometers, the invention adds synchronization module on the basis of traditional mechanically moving template Hadamard spectrometers, making the inverse-transform matrix of Hadamard spectrometers using the module, the signal peak peak position of each group inverse transformation spectrum finally given keeps constant with the mobile synchronous change of modulating-coding template.Compared to traditional mechanically moving template Hadamard spectrometers, The present invention reduces the alignment link of the peak position in inverse transformation process, save time overhead, improve the modulation /demodulation efficiency of Hadamard spectrometers, the extra error introduced because frequently correcting multiple inverse transformation spectrum is reduced, further improves Hadamard spectrometer detection signal-to-noise ratios.
Description
Technical field
The present invention relates to a kind of synchronous mechanically moving template type Hadamard spectrometers.
Background technology
Hadamard (Hadamard) spectrometer, it is on the basis of the single slit spectrometer of tradition, is controlled using pseudo-random sequence
And the modulating-coding template constructed substitutes traditional single entrance slit or exit slit, effectively increases luminous flux, improves light
Compose the detection sensitivity of detection.Hadamard spectrometers are an instruments that spectral information is obtained by modulated process, due to
Dispersive Devices are used, so single outgoing can be substituted using more slit encoders that Hadamard circulation pseudorandomcodes are scribed
Slit.In fact, traditional movable type mechanical stencil-type Hadamard spectrometers are not directly to be controlled using Hadamard matrixes
The spectrometer exit slit of system, but utilize the ingenious Hadamard conversion processes for realizing spectrum of mode of loopy moving.
Traditional Hadamard spectrometers, although having been realized in the Hadamard modulation and demodulation processes of spectrum, obtain
To the existing larger lifting in detection sensitivity of the more traditional spectrometer of spectrum, however, also existing in reduction is composed many
Ghost peak and distortion phenomenon.By observation, researcher has found, due in conventional method not in Hadamard modulating-codings part and
Synchronization mechanism is established between inverse Hadamard conversion modules, that is to say, that Hadamard coded modulation templates are in circulation timing
Mobile, however as the movement of Hadamard coding templets, it remains constant against Hadamard demodulation matrix, and this just leads
Causing, the peak position of the inverse Hadamard spectrum obtained every time is all shifting, and in order to be averaging to Multiple-Scan, we are to need
Obtained multiple inversion is exchanged cards with personal and family details when becoming sworn brothers and carries out peak position first to it, is then averaged again, thus, obtained inversion is exchanged cards with personal and family details when becoming sworn brothers and necessarily deposited
In the snr gain of larger error, eventually reduction Hadamard spectrometers.Therefore, it is portable to find a kind of quick solution
Mechanical template type Hadamard spectrometer stationary problems, the method for lifting its signal to noise ratio are very important.
The content of the invention
The technology of the present invention solves problem：For modulated terminal and inversion in traditional mechanically moving template type Hadamard spectrometers
The nonsynchronous problem in end is changed, proposes to introduce Synchronization Control template, improved mechanically moving template type Hadamard light is built with this
Spectrometer.The invention can be under the premise of the hardware configuration of existing movable type mechanical template formula Hadamard spectrometers not be changed, profit
Solve the stationary problem of modulated terminal and demodulating end with the synchronization module of introducing, save the complicated data handling procedure of demodulating end,
The accuracy of Hadamard spectrometers is improved, reduces detection error, improves the comprehensive detection of Hadamard spectrometers
Energy.
The technology of the present invention solution：A kind of synchronous mechanically moving template type Hadamard spectrometers, it include light source,
Entrance slit, grating (optical dispersion system), Hadamard modulating-codings template, rear optical system, photo-detector and inverse HT are converted
Module, the Hadamard modulating-codings template and inverse Hadamard conversion modules are connected with synchronization module, the synchronous mould
Block is controlled by single-chip microcomputer；The Hadamard modulating-codings template is connected with mobile module, the mobile module and synchronization module
It is connected, the synchronization module is controlled by single chip control module.
In one embodiment of the invention, the synchronization module can timing to Hadamardt modulating-codings template and inverse
Hadamard conversion modules send lock-out pulse, when Hadamard modulating-codings template detection to high trigger pulses, then move
One unit of dynamic coding templet, meanwhile, inverse Hadamard conversion modules can also translate once, to adapt to the change of coding templet.
In one embodiment of the invention, described seven pseudo random sequence codes of Hadamard modulating-codings stencil-chosen,
Corresponding inverse Hadamard transformation matrixs are also to be made up of seven pseudo random sequence codes, and initial pseudorandom sequence is：0010111.
The present invention compared with prior art the advantages of be：A kind of improved mechanically moving template type Hadamard of the present invention
Spectrometer adds synchronization control module relative to traditional mechanically moving template formula spectrometer, and the module can effectively solve multigroup
The peak position alignment problem of inverse transformation spectrum, the event handling expense of Hadamard spectrometers is saved, reduced because peak position translates
The error of introducing, improve the detection signal-to-noise ratio of Hadamard spectrometers.
Brief description of the drawings
Fig. 1 is a kind of synchronous mechanically moving template type Hadamard spectrometer schematic diagrams of the present invention；
Fig. 2 is conventional H adamard spectrometer Multiple-Scan results.
Fig. 3 is synchronous Hadamard spectrometer Multiple-Scan results.
Wherein, 1- light sources, the incident single slits of 2-, 3- gratings, 4-Hadamard modulating-coding templates, 5- rear optical systems,
6- photo-detectors, 7- is against Hadamard converting processing units, 8- mobile units, 9- synchronization modules, 10- single chip control modules.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of the present invention is described in detail.
As shown in figure 1, a kind of synchronous mechanically moving template type Hadamard spectrometer schematic diagrams, first, the light source 1
The light of injection produces dispersion after the entrance of single slit 2, through grating 3, so as to form more slit light；Then, multichannel light passes through
After Hadamard modulating-codings template 4, rear optical system 5 is entered, after being partially completed light focusing by this, light transmission is arrived
On detector 6, finally, inverse Hadamard conversion process module 7 by light collection and is sent into by detector, multichannel is completed by it and folded
Add the inversion process of spectrum, be finally reduced into single channel spectral signal.As can be seen that using the synchronization module newly introduced, ensure
The synchronism of modulated terminal and demodulating end, reduce the data processing complex of demodulating end.Synchronization module 9 is controlled by list in Fig. 1
Piece machine control module 10, under single-chip microcomputer control, synchronization module 9 controls the shifting of Hadamard coding templets using mobile unit 8
It is dynamic, at the same synchronization module also can timing adjustment against Hadamard conversion modules.
It is illustrated in figure 2 the Hadamard multichannel spectrum stack spectrals obtained when being not introduced into synchronization module and spectrum is inverse
Hadamard conversion spectrum results.Fig. 2-A are that the multichannel that mobile coding template obtains is superimposed modal data, and Fig. 2-B are with template
Mobile obtained inverse transformation spectrum, from Figure 2 it can be seen that primary modulation coding templet is often moved, obtained multiplexing stack spectral letter
Number becoming, however, because inverse-transform matrix is constant, therefore the peak position of obtained inverse transformation spectrum can be moved constantly, finally also be needed
Multi-group data is translated and is averaged again.
The synchronous mechanically moving template type Hadamard spectrometer testing results as carried out by Fig. 3.Fig. 3-A are mobile coding mould
The multichannel superposition modal data that plate obtains, Fig. 3-B are the inverse transformation spectrum obtained with the movement of template.It can be seen that introduce synchronous mould
No matter how coding templet changes the spectrum obtained after block, and the peak position that obtained inversion is exchanged cards with personal and family details when becoming sworn brothers can keep constant, and this is just ensured
Data processing end will not improve the letter of Hadamard spectrometer because frequently data being carried out with shifting function and caused error
Make an uproar ratio.
Above example is provided just for the sake of the description purpose of the present invention, and is not intended to limit the scope of the present invention.This
The scope of invention is defined by the following claims.The various equivalent substitutions that do not depart from spirit and principles of the present invention and make and repair
Change, all should cover within the scope of the present invention.
Claims (3)
1. a kind of synchronous mechanically moving template type Hadamard spectrometers, it include light source 1, entrance slit 2, grating 3,
Hadamard modulating-codings template 4, rear optical system 5, photo-detector 6 and inverse Hadamard conversion modules 7, the Hadamard
Modulating-coding template 4 and inverse Hadamard conversion modules are connected with mobile unit 8, and mobile unit 8 is connected with synchronization module 9,
The synchronization module 9 provides synchronizing signal, the synchronization module and inverse Hadamard transformation matrixs by single chip control module 10
It is connected, ensures that inverse Hadamard conversion modules change with Hadamard modulating-codings template synchronous.The light warp that the light source 1 is injected
After crossing single entrance of slit 2, dispersion is produced through grating 3, so as to form multichannel light；Then, multichannel light is modulated by Hadamard
After coding templet 4, rear optical system 5 is entered, the optical system mainly completes light focusing, by light transmission to detector
On 6, finally, inverse Hadamard conversion modules 7 by light collection and are sent into by detector, the inverse of multichannel superposition spectrum is completed by it
Conversion process, it is finally reduced into single channel spectral signal.
A kind of 2. synchronous mechanically moving template type Hadamard spectrometers according to claim 1, it is characterised in that：Institute
State Hadamard modulating-codings template 4 with mobile unit 8 to be connected, the mobile unit 8 is connected with synchronization module 9, the synchronization
Module 9 is driven by the single-chip microcomputer gating module 10, final to drive the movement of Hadamard coding templets timing cycle.
A kind of 3. synchronous mechanically moving template type Hadamard spectrometers according to claim 1, it is characterised in that：Institute
Synchronization module 9 is stated under the driving of single chip control module 10, regularly to Hadamard modulating-codings module and inverse Hadamard
Conversion module conveys Synchronization Control pulse.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021021020A1 (en) * | 2019-07-26 | 2021-02-04 | National University Of Singapore | An imaging system and a light encoding device therefor |
| CN112461366A (en) * | 2020-12-16 | 2021-03-09 | 四川长虹电器股份有限公司 | Method for realizing near-infrared spectrometer based on random filter array |
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