CN103822716A - High modulation degree Fourier transform spectrum obtaining method and spectrograph - Google Patents
High modulation degree Fourier transform spectrum obtaining method and spectrograph Download PDFInfo
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- CN103822716A CN103822716A CN201410056723.3A CN201410056723A CN103822716A CN 103822716 A CN103822716 A CN 103822716A CN 201410056723 A CN201410056723 A CN 201410056723A CN 103822716 A CN103822716 A CN 103822716A
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Abstract
The invention discloses a high modulation degree Fourier transform spectrum obtaining method and spectrograph. The method comprises the steps that after a broadband spectrum is dispersed, continuous monochromatic light is obtained; interferometry is conducted on the monochromatic spectrum, so that a high modulation monochromatic light interference pattern is obtained. Continuous monochromatic light splitting of the broadband spectrum is achieved through a dispersion element, the modulation degree of the interference pattern at the long optical path difference position is high, and the Fourier transform spectrograph is stable in structure, wide in waveband and high in modulation degree.
Description
Technical field
The present invention relates to optical image technology field, relate in particular to a kind of system Fourier transform spectrum acquisition methods and spectrometer to a high-profile.
Background technology
Fourier transform spectral technique (being called again interference spectrum technology) is as an important means of modern spectral analysis technique, it is a research emphasis in spectral technique field, the application of this technology is very extensive at present, particularly in atmospheric remote sensing field, this technology, with advantages such as its high precision, high sensitivity, high spectral resolutions, is used widely at the numerous areas such as species analysis, atmospheric exploration.
The traditional Michelson of comparing interferometer, does not have moving component in Fourier transform spectrometer, have better stability and environmental suitability.
Current Fourier transform spectrometer mainly contains two kinds, and one is called space heterodyne Fourier transform spectrometer, and one is called spatial modulation Fourier transform spectrometer.The advantage of space heterodyne Fourier transform spectrometer is that interferogram degree of modulation is high, and spectral resolution is high, very limited but its shortcoming is measure spectrum scope; The advantage of spatial modulation Fourier transform spectrometer is measure spectrum wide ranges, sharply declines in the degree of modulation at long optical path difference place but its shortcoming is interferogram with spectral range increase, and interference modulations signal is flooded by noise.In interferogram reconstruction spectroscopy procedure, in order to reduce noise to the impact of reconstruct spectrum, conventionally need to carry out filtering, this can reduce spectral resolution, causes the distortion of reconstruct spectrum simultaneously.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of system Fourier transform spectrum acquisition methods and spectrometer to a high-profile, improves Spectral modulation depth.
The object of the embodiment of the present invention is achieved through the following technical solutions:
A kind of spectrum of system Fourier transform to a high-profile acquisition methods, comprising:
Wide-band spectrum is carried out obtaining continuous monochromatic light after dispersion;
Described monochromatic spectrum is carried out interferometry and is obtained the monochromatic light interferogram of high modulation.
A kind of system Fourier transform spectrometer to a high-profile, comprising:
Dispersion spectrophotometric unit, obtains continuous monochromatic light for wide-band spectrum is carried out after dispersion;
Interferometry unit, obtains the monochromatic light interferogram of high modulation for described monochromatic spectrum is carried out to interferometry.
The technical scheme being provided by the invention described above embodiment can be found out, realize the continuous monochromatic light splitting of wide-band spectrum by dispersion element, and interferogram is high in the degree of modulation at long optical path difference place, implementation structure is stable, broadband, system Fourier transform spectrometer, to a high-profile.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is the embodiment of the present invention schematic flow sheet of system Fourier transform spectrum acquisition methods to a high-profile.
Fig. 2 is embodiment of the present invention system Fourier transform spectrometer formation schematic diagram to a high-profile.
Fig. 3 is embodiment of the present invention system Fourier transform spectrometer application schematic diagram to a high-profile.
Fig. 4 is target optical spectrum schematic diagram in embodiment of the present invention lofty tone system Fourier transform spectrometer.
Fig. 5 is interferogram and relatively schematic diagram of prior art interferogram in embodiment of the present invention lofty tone system Fourier transform spectrometer, wherein, Fig. 5 a is prior art spatial modulation Fourier transform spectrometer interferogram, and Fig. 5 b is the present invention's interference imaging result that system Fourier transform spectrometer detector obtains to a high-profile.
Fig. 6 is the interferogram of Fig. 5 b the first row.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on embodiments of the invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to protection scope of the present invention.
As shown in Figure 1, the embodiment of the present invention provides system Fourier transform spectrum acquisition methods to a high-profile, comprising:
The technical scheme being provided by the invention described above embodiment can be found out, realize the continuous monochromatic light splitting of wide-band spectrum by dispersion element, and interferogram is high in the degree of modulation at long optical path difference place, implementation structure is stable, broadband, system Fourier transform spectrometer, to a high-profile.
Particularly, broadband is for narrow wave band, and broadband can refer to 450nm-900nm wavelength band, or 450nm-1000nm wavelength band, etc.
Particularly, step 11 carries out wide-band spectrum to obtain continuous monochromatic light after dispersion, can comprise:
Adopt dispersion element, described broadband light is carried out obtaining continuous monochromatic light after dispersion, described dispersion element comprises grating or prism.
Particularly, step 12 is carried out interferometry and obtains the monochromatic light interferogram of high modulation to described monochromatic spectrum, can comprise:
Described monochromatic spectrum obtains money order coloured light through imaging lens;
Described money order coloured light forms the relevant monochromatic light of two bundles after lateral shearing interferometer;
Described relevant monochromatic light converges and obtains collimated monochromatic light after Fourier mirror;
Described collimated monochromatic light obtains monochromatic light interferogram at detector image-forming after cylindrical mirror.
To those skilled in the art, imaging lens, lateral shearing interferometer, Fourier mirror, cylindrical mirror, detector and principle thereof can be understood with reference to prior art, and therefore not to repeat here.
Visible, realize the continuous monochromatic light splitting of wide-band spectrum by dispersion element, realize the lofty tone system of continuous quasi-monochromatic light interferes by lateral shearing interferometer, Fourier mirror and cylindrical mirror, and, there is no moving component, have better stability and environmental suitability, implementation structure is stable, broadband, system Fourier transform spectrometer, to a high-profile.
Or step 12 is carried out interferometry and obtains the monochromatic light interferogram of high modulation to described monochromatic spectrum, can comprise:
Described monochromatic spectrum forms the relevant monochromatic light of two bundles after Michelson interferometer, and described Michelson interferometer comprises static mirrors, motor reflex mirror and beam splitter;
Described relevant monochromatic light produces interference imaging after Fourier mirror at detector place, along with the continuous translation of described motor reflex mirror, between described motor reflex mirror and described static mirrors, produce continually varying optical path difference, described detector sampling obtains the monochromatic light interferogram at different optical path differences place.
To those skilled in the art, Michelson interferometer, Fourier mirror, detector and principle thereof can be understood with reference to prior art, and therefore not to repeat here.
As shown in Figure 2, the lofty tone system Fourier transform spectrum acquisition methods of corresponding above-described embodiment, the embodiment of the present invention provides a kind of system Fourier transform spectrometer to a high-profile, comprising:
Dispersion spectrophotometric unit 21, obtains continuous monochromatic light for wide-band spectrum is carried out after dispersion;
Interferometry unit 22, obtains the monochromatic light interferogram of high modulation for described monochromatic spectrum is carried out to interferometry.
The technical scheme being provided by the invention described above embodiment can be found out, realize the continuous monochromatic light splitting of wide-band spectrum by dispersion element, and interferogram is high in the degree of modulation at long optical path difference place, implementation structure is stable, broadband, system Fourier transform spectrometer, to a high-profile.
Particularly, broadband is for narrow wave band, and broadband can refer to 450nm-900nm wavelength band, or 450nm-1000nm wavelength band, etc.
Particularly, dispersion spectrophotometric unit 21 is dispersion element, and described dispersion element comprises grating or prism.
Particularly, interferometry unit 22 can comprise imaging lens, lateral shearing interferometer, Fourier mirror and cylindrical mirror;
Described monochromatic spectrum obtains money order coloured light through described imaging lens;
Described money order coloured light forms the relevant monochromatic light of two bundles after described lateral shearing interferometer;
Described relevant monochromatic light converges and obtains collimated monochromatic light after described Fourier mirror;
Described collimated monochromatic light obtains monochromatic light interferogram at described detector image-forming after described cylindrical mirror.
To those skilled in the art, imaging lens, lateral shearing interferometer, Fourier mirror, cylindrical mirror, detector and principle thereof can be understood with reference to prior art, and therefore not to repeat here.
Visible, realize the continuous monochromatic light splitting of wide-band spectrum by dispersion element, realize the lofty tone system of continuous quasi-monochromatic light interferes by lateral shearing interferometer, Fourier mirror and cylindrical mirror, and, there is no moving component, have better stability and environmental suitability, implementation structure is stable, broadband, system Fourier transform spectrometer, to a high-profile.
Or interferometry unit 22 can comprise Michelson interferometer, Fourier mirror and detector;
Described monochromatic spectrum forms the relevant monochromatic light of two bundles after described Michelson interferometer, and described Michelson interferometer comprises static mirrors, motor reflex mirror and beam splitter;
Described relevant monochromatic light produces interference imaging after described Fourier mirror at described detector place, along with the continuous translation of described motor reflex mirror, between described motor reflex mirror and described static mirrors, produce continually varying optical path difference, described detector sampling obtains the monochromatic light interferogram at different optical path differences place.
To those skilled in the art, Michelson interferometer, Fourier mirror, detector and principle thereof can be understood with reference to prior art, and therefore not to repeat here.
As shown in Figure 3, the embodiment of the present invention provides a kind of system Fourier transform spectrometer to a high-profile, comprises pointolite 31, collimating mirror 32, dispersion element 33, imaging lens 34, lateral shearing interferometer 35, Fourier mirror 36, cylindrical mirror 37 and detector 38.
The system Fourier transform spectrometer course of work is as follows to a high-profile for the embodiment of the present invention:
The light that pointolite 31 sends, after collimating mirror 32, becomes directional light collimated light;
Collimated light, after dispersion element 33, is a series of continuous collimated monochromatic lights by dispersion;
Collimated monochromatic light, after imaging lens 34, becomes a series of continuous money order coloured light;
Money order coloured light, after lateral shearing interferometer 35, is cut into the relevant money order coloured light of two bundles;
Relevant money order coloured light is after Fourier mirror 36, and money order coloured light becomes collimated monochromatic light, and meanwhile, the relevant collimated monochromatic light of two bundles produces and interferes at detector;
Collimated monochromatic light is after cylindrical mirror 37, in detector 38 imagings.
Visible, the embodiment of the present invention is system Fourier transform spectrometer to a high-profile, what obtain in detector image planes is no longer the stack of all monochromatic light interferograms, but the interferogram of a series of quasi-monochromatic lights, compared with space heterodyne Fourier transform spectrometer, the embodiment of the present invention to a high-profile system Fourier transform spectrometer enough realizes wide-band spectrum measurement.
Fig. 4 is target optical spectrum, and Fig. 5 a is the interferogram that prior art spatial modulation Fourier transform spectrometer obtains, and Fig. 5 b is the embodiment of the present invention interference imaging result that system Fourier transform spectrometer detector obtains to a high-profile, and Fig. 6 is the first row interferogram in Fig. 5 b.
Can find out, the embodiment of the present invention interferogram that system Fourier transform spectrometer obtains to a high-profile is obviously better than in the degree of modulation at long optical path difference place the interferogram degree of modulation that prior art spatial modulation Fourier transform spectrometer obtains.
Comprehensive above description, the embodiment of the present invention is system Fourier transform spectrometer to a high-profile:
Can realize the interferometry of wide-band spectrum.Compared with space heterodyne Fourier transform spectrometer, the spectral range of measurement is generally tens times of space heterodyne Fourier transform spectrometer.
For wide-band spectrum, can realize system interferogram to a high-profile and measure.The interference data that prior art spatial modulation Fourier transform spectrometer obtains is very low at the interference modulations degree at long optical path difference place, flooded by noise, the embodiment of the present invention to a high-profile system Fourier transform spectrometer can become wide-band spectrum a series of narrow-band spectrums by space distribution, thereby improves the interferogram degree of modulation of each narrow-band spectrum.
The above; only for preferably embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (8)
1. a lofty tone system Fourier transform spectrum acquisition methods, is characterized in that, comprising:
Wide-band spectrum is carried out obtaining continuous monochromatic light after dispersion;
Described monochromatic spectrum is carried out interferometry and is obtained the monochromatic light interferogram of high modulation.
2. lofty tone system Fourier transform spectrum acquisition methods according to claim 1, is characterized in that, wide-band spectrum is carried out obtaining continuous monochromatic light after dispersion, comprising:
Adopt dispersion element, described broadband light is carried out obtaining continuous monochromatic light after dispersion, described dispersion element comprises grating or prism.
3. lofty tone system Fourier transform spectrum acquisition methods according to claim 1 and 2, is characterised in that, described monochromatic spectrum is carried out to interferometry and obtain monochromatic light interferogram, comprising:
Described monochromatic spectrum obtains money order coloured light through imaging lens;
Described money order coloured light forms the relevant monochromatic light of two bundles after lateral shearing interferometer;
Described relevant monochromatic light converges and obtains collimated monochromatic light after Fourier mirror;
Described collimated monochromatic light obtains monochromatic light interferogram at detector image-forming after cylindrical mirror.
4. lofty tone system Fourier transform spectrum acquisition methods according to claim 1 and 2, comprising:
Described monochromatic spectrum forms the relevant monochromatic light of two bundles after Michelson interferometer, and described Michelson interferometer comprises static mirrors, motor reflex mirror and beam splitter;
Described relevant monochromatic light produces interference imaging after Fourier mirror at detector place, along with the continuous translation of described motor reflex mirror, between described motor reflex mirror and described static mirrors, produce continually varying optical path difference, described detector sampling obtains the monochromatic light interferogram at different optical path differences place.
5. a lofty tone system Fourier transform spectrometer, is characterized in that, comprising:
Dispersion spectrophotometric unit, obtains continuous monochromatic light for wide-band spectrum is carried out after dispersion;
Interferometry unit, obtains the monochromatic light interferogram of high modulation for described monochromatic spectrum is carried out to interferometry.
6. lofty tone system Fourier transform spectrometer according to claim 5, is characterized in that, described dispersion spectrophotometric unit is dispersion element, and described dispersion element comprises grating or prism.
7. according to the lofty tone system Fourier transform spectrometer described in claim 5 or 6, be characterised in that, described interferometry unit comprises imaging lens, lateral shearing interferometer, Fourier mirror and cylindrical mirror;
Described monochromatic spectrum obtains money order coloured light through described imaging lens;
Described money order coloured light forms the relevant monochromatic light of two bundles after described lateral shearing interferometer;
Described relevant monochromatic light converges and obtains collimated monochromatic light after described Fourier mirror;
Described collimated monochromatic light obtains monochromatic light interferogram at described detector image-forming after described cylindrical mirror.
8. according to the lofty tone system Fourier transform spectrometer described in claim 5 or 6, comprising:
Described interferometry unit comprises Michelson interferometer, Fourier mirror and detector;
Described monochromatic spectrum forms the relevant monochromatic light of two bundles after described Michelson interferometer, and described Michelson interferometer comprises static mirrors, motor reflex mirror and beam splitter;
Described relevant monochromatic light produces interference imaging after described Fourier mirror at described detector place, along with the continuous translation of described motor reflex mirror, between described motor reflex mirror and described static mirrors, produce continually varying optical path difference, described detector sampling obtains the monochromatic light interferogram at different optical path differences place.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113447125A (en) * | 2021-07-05 | 2021-09-28 | 中国科学院空天信息创新研究院 | Multi-resolution mode interference spectrum system |
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| CN1256407A (en) * | 1999-12-28 | 2000-06-14 | 中国科学院西安光学精密机械研究所 | Interference imaging spectral technology and equipment |
| US20050185179A1 (en) * | 2004-02-25 | 2005-08-25 | Wang Sean X. | Fourier transform spectrometer apparatus using multi-element mems |
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| CN1256407A (en) * | 1999-12-28 | 2000-06-14 | 中国科学院西安光学精密机械研究所 | Interference imaging spectral technology and equipment |
| US7167249B1 (en) * | 2003-11-25 | 2007-01-23 | Kestrel Corporation | High efficiency spectral imager |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113447125A (en) * | 2021-07-05 | 2021-09-28 | 中国科学院空天信息创新研究院 | Multi-resolution mode interference spectrum system |
| CN113447125B (en) * | 2021-07-05 | 2023-02-28 | 中国科学院空天信息创新研究院 | Multi-resolution mode interference spectrum system |
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