CN104215331A - Method for realizing ultrahigh resolution of near-infrared dispersion type spectrum analyzer - Google Patents
Method for realizing ultrahigh resolution of near-infrared dispersion type spectrum analyzer Download PDFInfo
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Abstract
The invention discloses a method for realizing an ultrahigh resolution of a near-infrared dispersion type spectrum analyzer. The method comprises the following steps of: adopting a processed multi-wavelength light source as a light source of a spectrograph, and performing spectrum scanning and sampling on a light transmission characteristic curve of a to-be-detected sample through a light shifting frequency; realizing detection of the spectrum through a CCD detector spectrum data reading and rearranging technology. Through the method, the resolution does not depend on the number and size of pixels of a detector and an optical grating dispersive power; in addition, the resolution of the spectrograph is at least improved by two orders of magnitudes (reaches to 0.1 pm level); besides the precise frequency shifting technology, the line width of the multi-wavelength light source must be squeezed to be less than the minimum frequency shifting amount of the multi-wavelength light source as the line width obtained by a common multi-wavelength light source technology is relatively big, so that the improvement by two orders of magnitudes of the resolution of a spectrograph system is ensured in the aspect of the light source.
Description
Technical field
The present invention relates to communication, Instrument technology field, particularly relate to a kind of method realizing near infrared color dispersion-type spectroanalysis instrument ultrahigh resolution.
Background technology
Spectrometer is the scientific instrument light of complicated component being decomposed into spectrum line, its internal chemical composition and content thereof can be determined by the absorption spectrum of measurement of species, have a wide range of applications in fields such as scientific experiment, biomedicine, food security, environment, geology, national defence always
[1-3].
In recent years, along with developing rapidly and fusion of the subject such as microelectronics, optical technology, near-infrared spectral analysis technology because its instrument is simple, analysis speed is fast, efficient, accurately, analysis cost is low, do not destroy sample, do not consume chemical reagent, free from environmental pollution, be almost applicable to the features such as all kinds of form sample (liquid, viscous body, coating, powder and solid) analysis, polycomponent hyperchannel Simultaneously test, receive the concern of more and more people.Along with the development of spectrometer, the receiving system of spectrometer also develops into electro-optical system from initial visual system, and photelectric receiver also becomes detector array from single-geophone receiver device development, the performance index of spectrometer, method of operating and man-machine interaction interface move to maturity and perfect just step by step.
The absorption spectrum of material has different features at different-waveband, belongs to atom or ion energy level at the absorption peak spectral line of visible waveband, and distance is larger, and the color dispersion-type spectrometer of general resolution just can distinguish the chemical composition of most of material.Near infrared spectrum belongs to molecular vibration spectrum, results from the non-simple harmonic quantity energy level vibration of covalent chemical bond, is frequency multiplication and the combination frequency of anharmonic vibration, for hydric group, as the material containing C-H, O-H, N-H all can produce near infrared spectrum.Because near infrared spectrum is the absorption spectrum that frequency multiplication or combination produce frequently, absorption signal is weak, and bands of a spectrum are overlapping serious, and common spectrometer cannot be differentiated.Therefore, the non-visible region that although near-infrared region spectrum is people to be found the earliest, but due to early stage spectrally resolved limited in one's ability, even if utilize near infrared spectrometer also the bands of a spectrum of overlap cannot be separated completely, this has made near infrared spectrum once be sunk into sleep many years.Along with the development of nir instrument technology, the development of more stable power supply, signal amplifier, sensitiveer photon detector, microcomputer etc. makes near infrared spectrum district as one section independently and have the spectrum district of unique information feature to obtain to pay attention to and development.People complete the analysis near infrared spectrum by later stage chemo metric software, model and relevant auxiliary facility.Up to the present, near-infrared spectrum technique is called " giant of analysis " by people
[4].In view of this, if spectrometer can realize higher resolution, just likely help us to obtain more, more fully sample message, at field of scientific study, high-resolution near infrared spectrometer can be used for measuring and analyzing the various spectrum with fine structure.This perhaps can make the research work of people to material climb up a new step.
From the principle, near infrared spectrometer can be divided into color dispersion-type spectrometer and the large class of Fourier spectrometer two
[5].The difference of light splitting technology result in the restriction that its resolution is subject to Different factor.Color dispersion-type spectrometer measurement be real spectrum, resolution depends on the restriction of the resolution characteristic (pixel size) of the dispersion power of dispersion element (grating or prism) and the line array CCD as optical receiver.Compared with visible light wave range, the resolution of near infrared spectrometer is much lower, and this is that grating dispersion ability declines because wavelength is longer on the one hand; The photo-detector difference owing to adopting on the other hand, in visible region, adopt the Si detector array of technics comparing maturation, number of pixels many (generally can reach 2048), and Pixel Dimensions can do very little (several micron), and the InGaAs detector array pixel used near infrared spectrometer fewer (being generally 256), Pixel Dimensions is larger (tens microns) also, the spatial dispersion resolution characteristic of light is declined, and cost is high.
At present, the commercial color dispersion-type spectrometer that the resolution that external each company produces is higher has: the DWARF-Star of the up-to-date release of U.S. StellarNet adopts linear array InGaAs detector, is 1.25nm at 900-1700nm scope intrinsic resolution.The AvaSpec series near infrared spectrometer of Avantes company of Holland, measurement range is between 900-1750nm, and when using 256 pixel detector, resolution is up to 2nm, and when using 512 pixel detector, resolution is up to 1.5nm.The MicroHR spectrometer of JobinYvon company of France exploitation, under 0.25nm resolution, measurement range can reach 0-1500nm.U.S. OceanOptics is after releasing the fiber spectrometer covering ultraviolet, visible, short-wave infrared, and be proposed again NIR QUEST series near infrared spectrometer, highest resolution can reach 0.25nm.The resolution characteristic of the high-end color dispersion-type spectrometer used in laboratory can reach 0.01nm (10pm), and the Agilent as Japanese Yokogawa and the U.S. all produces the color dispersion-type spectroanalysis instrument that can reach 0.01nm (10pm) at C-band (1530-1560nm) wavelength resolution.The highest resolution record is created by the ZOOM Spectra of French Resolution Spectra company and kept at present, and the detection resolution of spectrometer is 5pm.Another French company of family---APEX technology company illustrates their spectrometer newest fruits in the optical communication annual meeting (OFC 2014) of 2014, its resolution can reach 40fm (5MHz), and what APEX company claimed that they adopt is interference technique
[6].This is spectral resolution the highest in the world at present.
Time-domain signal measured by Fourier spectrometer, then by calculating spectrum curve, its light splitting technology is based on core component Michelson interferometer, and highest resolution depends on the ultimate range L of index glass scanning in interferometer, resolution ax υ=1/ (2L)
[7].At present, the interferometer that can realize high-resolution is air bearing interferometer and mechanical bearing interferometer, and the highest resolution of its spectrum can be better than 0.1cm
-1(3GHz), resolution is higher than 0.1cm
-1after, index glass distance of movement on bearing is long, and (such as, resolution is 0.01cm
-1spectrometer, the ultimate range of its index glass movement will reach 50cm), machining accuracy require high, be difficult to meet the demands.Therefore, the resolution of Fourier spectrometer is subject to the restriction of the ultimate range of index glass movement in interferometer.The resolution of above the mentioned up-to-date release of APEX company can reach the spectrometer of 40fm (5MHz), the spectrometer of principle that to be a kind of with interference technique be, detail is not open, but its principle has necessarily effectively evaded the limiting factor of Fourier spectrometer resolution.
Summary of the invention
The invention provides a kind of method realizing near infrared color dispersion-type absorption spectrometer ultrahigh resolution, in the spectral analysis instrument system intending research (see Fig. 1), adopt multi wave length illuminating source (Multi-wavelength Source), also referred to as the light source of frequency comb light source as spectrometer, adopt accurate light shift frequency (the light frequency sweep grasped, Frequency sweeping) the light transmission features curve of technology to testing sample (Sample to be tested) carry out spectral scan and sampling, realizes spectrometer function.Light shift frequency interval is minimum can be reached or be less than 0.1pm, the resolution characteristic of spectrometer is made to be limited to no longer merely the dispersive power of dispersive optical element (grating or prism), and the restriction of the resolution characteristic of CCD receiver (size of pixel cell), thus make spectrally resolved ability improve two orders of magnitude, or higher, described below:
Realize a method near infrared color dispersion-type absorption spectrometer ultrahigh resolution, comprise the following steps:
(1) by common multi wave length illuminating source after amplifying, utilize high non-linearity four-wave mixing effect to produce more wavelength, make multi-wavelength 10dB scope can be wider, scope be about 30nm ~ 60nm.The wavelength interval of multi-wavelength is equal, and can change in the scope of 10GHz to 50GHz.Such frequency comb continuous light source, then narrow multi-wavelength live width through optical fiber stimulated Brillouin scattering, makes live width be less than to estimate the spectral resolution realized, thus obtains the frequency comb of wide region needed for spectral analysis instrument system, narrow linewidth.
(2) the accurate frequency shift technique of multi-wavelength: utilize single-side belt photomodulator to realize the accurate frequency shift technique of multi-wavelength.
Single-side belt photomodulator (SSB) is the photomodulator driven by rf signal, when frequency is ω
cmonochromatic wave enter SSB modulators modulate after, if the frequency of rf signal is ω
m, the monochromatic wave frequency so exported from SSB will become ω
c-ω
m(or ω
c+ ω
m), thus realize shift frequency.SSB modulator depends on loaded radio-frequency (RF) driving signal frequencies omega to the shift frequency amount that input light realizes
m, with ω
cirrelevant.Utilize this principle, when multi-wavelength signals mentioned above is passed into SSB modulator simultaneously, the shift frequency amount that different wave length obtains is equal, is ω
m, therefore, multi-wavelength signals can realize overall shift frequency
[8-9].In the present invention, in order to improve the resolution of spectrometer, minimum shift frequency amount is 10MHz (0.08pm).
(3) CCD sense data reordering technique
CCD linear array is that record measured object is through the device of light intensity with the curve of wavelength variations, multi-wavelength light is after measured object, transmitted light contains the information of measured object absorption spectra, transmitted light is after common grating implementation space dispersion, through ordinary optical imaging system, the discrete sampling multi-wavelength light beam that carry determinand transmission spectrum information is imaged in CCD linear array, the locus of each CCD pixel corresponds to the original numerical value not having each wavelength of the multi wave length illuminating source of shift frequency, and the photogenerated current size that CCD pixel produces corresponds to light intensity numerical value.In follow-up accurate shift frequency process, the size of wavelength is determined jointly by shift frequency amount and shift frequency number of times, and corresponding transmitted light intensity is determined by CCD sense data.
This spectroscopic data obtain manner is the most crucial innovation of the present invention, namely be can overlapping (even hot spot can close to overlapping) at the hot spot not being imaged on the different wave length in same CCD pixel (minimum difference 0.1pm) light beam in the same time, but their wavelength (or frequency) still can be distinguished by known shift frequency amount and shift frequency number of times and be determined, does not need the Airy disk spatially distinguishing adjacent wavelength.Therefore, the size of Airy disk and the large young pathbreaker of CCD pixel have been no longer the factors of restriction spectrometer resolution.
Effective combination of above technology, can be implemented in the spectral detection of the ultrahigh resolution (spectral resolution is about 0.1pm) within the scope of 30nm ~ 60nm.
Accompanying drawing explanation
Fig. 1 is ultrahigh resolution near-infrared transmission spectrometer structural representation;
Fig. 2 is the hot spot imaging distribution schematic diagram in CCD linear array;
Fig. 3 is ultrahigh resolution near-infrared transmission spectrometer principle of work schematic diagram;
Fig. 4 is the schematic diagram of asymmetric crossed formula Czerny-Turner optical table system.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below embodiment of the present invention is described further in detail.
The structure of tradition color dispersion-type spectrometer comprises: light source, beam splitter, sample cavity, ccd detector, data handling system.In the present invention, larger change is done to the selection of light source and CCD, obtained a kind of new technical scheme improving color dispersion-type spectrometer resolution.
In this spectroanalysis instrument (as shown in Figure 1), adopt multi-wavelength (wavelength number the is Integer N) light source after linewidth narrowing process as the light source of spectrometer, the accurate shift frequency of multi-wavelength is realized by precise light frequency shift technique, shift frequency step-length is between 10MHz to 10GHz, wherein minimum shift frequency step-length 10MHz corresponds to the highest wavelength resolution of this spectroanalysis instrument is 0.08pm, is about 0.1pm; When shift frequency step-length is 10GHz, this corresponding spectroanalysis instrument wavelength resolution is 0.08nm.Spectral scan and sampling is carried out with the light transmission features curve of multi wave length illuminating source to testing sample of above-mentioned stepping shift frequency; And by the dispersion of grating implementation space, the spectroscopic data of each frame of ccd detector record read by data syn-chronization, finally by the rearrangement of each frame spectroscopic data, the light transmission features curve of reproducing testing sample, realizes the detection of spectrum.
Relative to the color dispersion-type spectroanalysis instrument of generally traditional Single wavelength scanning color dispersion-type spectroanalysis instrument or wideband light source list slit scan, spectroanalysis instrument of the present invention has two features: 1. with N number of (N is the integer of scope between 10 ~ 1000) multi-wavelength synchronous scanning, under the prerequisite of the resolution and scanning survey scope that do not reduce spectroanalysis instrument, Measuring Time N can be shortened doubly, or improve sweep velocity N doubly.2. the sense data not in the same time in CCD linear array is reset the absorption curve reproducing measured object, thus break Airy disk (Airy disc) restriction to resolution of aerial image, the wavelength resolution of this spectroanalysis instrument is made to be subject to no longer merely the restriction of CCD Pixel size and grating dispersion ability, under the prerequisite of particular/special requirement is not proposed to the resolving power of CCD linear array and grating, spectral resolution can also be improved 2 orders of magnitude.
101: the principle of work of high precision optical spectrum analyzer: adopt multi wave length illuminating source as the light source of spectrometer, spectral scan and sampling is carried out by the light transmission features curve of light shift frequency to testing sample, CCD linear array record sampled data, complete CCD sense data by computing machine to reset, reproduce absorption spectra to be measured.
In spectral analysis instrument system, multi wave length illuminating source, the CCD sense data reordering technique of frequency shift system and time-sharing recording is three key components, and it is innovative part place of the present invention that three effectively combines.
(1) multi wave length illuminating source: common multi wave length illuminating source after amplifying, utilizes high non-linearity four-wave mixing effect to produce more wavelength by the present invention, makes multi-wavelength 10dB scope can be wider, minimum 30nm, maximumly can reach 60nm.Wavelength interval between multi-wavelength is equal, can change in the scope of 10GHz to 50GHz, and when requiring to obtain fast hi-resolution spectrographic detection, typical wavelength interval is 10GHz.When not requiring sweep rate, multi-wavelength interval can be 10GHz, even larger.Frequency comb continuous light source, then narrow multi-wavelength live width through stimulated Brillouin scattering, makes it to be less than the spectral resolution estimating to realize, thus obtains the frequency comb of wide region needed for spectral analysis instrument system, narrow linewidth.
(2) the accurate frequency shift technique of multi-wavelength: utilize single-side belt photomodulator to realize the accurate frequency shift technique of multi-wavelength.
Single-side belt photomodulator (SSB) is the photomodulator driven by rf signal, when frequency is ω
cmonochromatic wave enter SSB modulators modulate after, if the frequency of rf signal is ω
m, the monochromatic wave frequency so exported from SSB will become ω
c-ω
m(or ω
c+ ω
m).Being equivalent to frequency is ω
clight carrier after SSB modulator, be modulated to ω
c-ω
mlight, thus realize shift frequency.The shift frequency amount of SSB modulator to input light depends on loaded radio-frequency (RF) driving signal frequencies omega
m, with ω
cirrelevant.Utilize this principle, when multi-wavelength signals mentioned above is passed into SSB modulator simultaneously, the shift frequency amount that different wave length obtains is equal, is ω
m, therefore, multi-wavelength signals can realize overall shift frequency
[8-9].In the present invention, in order to improve the resolution of spectrometer, minimum shift frequency amount is 10MHz (0.08pm).
(3) CCD sense data reordering technique
CCD linear array is that record measured object is through the device of light intensity with the curve of wavelength variations, multi-wavelength light is after measured object, transmitted light contains the information of measured object absorption spectra, transmitted light is after common grating implementation space dispersion, through ordinary optical imaging system, the discrete sampling multi-wavelength light beam that carry determinand transmission spectrum information is imaged in CCD linear array, the locus of each CCD pixel corresponds to the original numerical value not having each wavelength of the multi wave length illuminating source of shift frequency, the photogenerated current size that CCD pixel produces, corresponding to light intensity.In follow-up accurate shift frequency process, the size of wavelength is determined jointly by shift frequency amount and shift frequency number of times, and corresponding transmitted light intensity is determined by CCD sense data.
This spectroscopic data obtain manner is the most crucial innovation of the present invention, it makes the determination of spectroanalysis instrument medium wavelength be no longer determined by the locus of CCD uniquely, but jointly determined by shift frequency amount and shift frequency number of times, therefore do not need the Airy disk spatially distinguishing adjacent wavelength.So, the factor limiting spectroanalysis instrument resolution has been no longer just the size of Airy disk and the size of CCD pixel.In the present invention, in each CCD pixel, distinguish by the shift frequency of light source and read wavelength values, although be not therefore imaged on different wave length in same CCD pixel in the same time, or different frequency (minimum difference 0.1pm, or 10MHz) hot spot of light beam is seriously overlapping, their wavelength (or frequency) is still can be distinguished by known shift frequency amount and shift frequency number of times and be determined.
102: high precision optical spectrum analyzer principle of work illustrates:
Specifically, suppose there is a comb spectrum multi-wavelength continuous light source, can export the continuous light of 6 wavelength, intensity is all identical simultaneously, and wavelength is λ respectively
1, λ
2..., λ
6, the interval of adjacent wavelength is also all identical, is designated as Λ.Testing sample is irradiated with this multi-wavelength light, space light splitting is carried out again with grating pair sample transmission light, afterwards, receive by the transmitted light of space dispersive 6 wavelength with CCD photodetector array, receive hot spot distribution as shown in Figure 2 (Fig. 2 be in principle of work multi wave length illuminating source after determinand, in the different frequency sweep moment, the hot spot distribution schematic diagram of transmitted light on ccd array).Before frequency sweep starts, the optical spectrum of transmitted light distributes by the spectral representation in the t=0 moment of Fig. 3.Before the subsequent time t=1 moment arrives, by light frequency shift technique, carry out shift frequency to the output light of light source, these 6 wavelength move Δ λ to long wave direction simultaneously, and 6 wavelength in such t=0 moment, in the t=1 moment, become λ
1+ Δ λ, λ
2+ Δ λ ..., λ
6+ Δ λ, by that analogy, in the t=2 moment, 6 wavelength become λ
1+ 2 Δ λ, λ
2+ 2 Δ λ ..., λ
6+ 2 Δ λ.In figure 3, in the t=3 moment, 6 wavelength become λ
1+ 3 Δ λ=λ
2, λ
2+ 3 Δ λ=λ
3..., λ
6+ 3 Δ λ=λ
7.Simultaneously 6 hot spots position on CCD pixel as shown in Figure 2.Like this, in one-period (in 3 time quantums from t=0 to t=3), wavelength scanning range is across λ
7to λ
1, totally 6 comb interval (λ
7– λ
1=6 Λ).The minimum resolution of wavelength is the shift frequency amount Δ λ in each time quantum.Can find out such length scanning principle intuitively, than Single wavelength scanning, sweep limit is still from λ
1to λ
7, sweep spacing or Δ λ, save the sweep time of 6 times.
The more important thing is that shift frequency interval delta λ can not be subject to the resolving power of grating and the restriction of CCD pixel size, namely the restriction of the Airy disk size of diffraction limit can be broken through, and minimum shift frequency interval delta λ is corresponding with the resolution of this spectroanalysis instrument, it only and the minimum shift frequency interval that can realize and multi-wavelength live width relevant.In the present invention, shift frequency interval delta λ can accomplish 0.1pm.
Next step how to extract these scanning optical spectrum data, and their docking got up, and recovers, reproduces the pattern of absorption spectrum to be measured.λ in measurement
1, λ
2... λ
6the light intensity at each wavelength place can be measured by the gray-scale value of ccd detector, is recorded as [a as the t=0 moment reads gray-scale value
1, b
1, c
1, d
1, e
1f
1], in the t=1 moment, 6 wavelength become λ respectively
1+ Δ λ, λ
2+ Δ λ ... λ
6+ Δ λ, the light of such one group of multi-wavelength treats survey spectroscopically detectable again, measures second group of data [a
2, b
2, c
2, d
2, e
2, f
2], in like manner, obtain the 3rd group of data [a in the t=3 moment
3, b
3, c
3, d
3, e
3, f
3].After one-period scanning, obtain 3 groups of data, often organize the light intensity that data are each pixel place of synchronization, as a
1, a
2, a
3corresponding to the gray-scale value of first pixel, three records, represent λ successively
1, λ
1+ Δ λ, λ
1the light intensity value at+2 Δ λ places, is arranged as all gray-scale values from being short to long order according to length scanning: [a
1, a
2, a
3, b
1, b
2, b
3..., f
1, f
2, f
3], the result obtained is spectrogram to be measured, as shown in the spectrum picture after data processing in Fig. 3.
Said method, has effectively evaded two defects of traditional color dispersion-type spectrometer, and namely comparatively slow the and dispersion element of sweep velocity and ccd detector are to the restriction of resolution.The method that N number of wavelength scans simultaneously makes sweep velocity improve N doubly.The ccd detector selecting to meet above-mentioned condition under cost-effective prerequisite achieves the raising to spectrometer resolution from new angle, reaches two orders of magnitude (0.1pm).
List of references
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[3] Wu Yuliang, Shen Qin, Jing Yafeng etc. application forecast [J] .2011. of near infrared online detection technology in prepared slices of Chinese crude drugs concocting process matter
[4] Xu Guangtong, Yuan Hongfu, Lu Wanzhen. Modern Near-Infrared Spectroscopic Techniques and application progress [J]. spectroscopy and spectral analysis, 2000,20 (2): 134-142.
[5] lucky Umihiko. near infrared spectroscopy instrument technology [J]. Modern Scientific Instruments, 2001,6:25-28.
[6]APEXTECHNOLOGIES.Opticalspectrumanalyzer[DB/OL].http://www.apex-t.com/optical-spectrum-analyzer/.2014/2014–07–10.
[7] Weng Shifu. Fourier transform infrared spectrometer [M]. Beijing: Chemical Industry Press, 2005.
[8] Hou Yunzhe, Wang Zhaoying, Qin Xuwei etc. utilize single side-band modulator to realize controlling modulation technique [J] to the high-precision radio frequency of multi-wavelength optical fiber laser. Chinese laser, 2014,41 (8): 08050011 (1)-0805001 (6).
[9]Zhaoying?Wang,Xuwei?Qin,Cuiqin?Gao.Precise?Simultaneous?Multiwavelength?Tuning?by?Electrical?RF?Signals[J].Photonics?Technology?Letters,IEEE,2013,25(10):914-916.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. realize a method near infrared color dispersion-type spectroanalysis instrument ultrahigh resolution, it is characterized in that, said method comprising the steps of:
The wavelength interval of employing narrow linewidth is the multi wave length illuminating source of N number of long wavelength laser as spectroanalysis instrument of Λ, by to carry out the transmitted light intensity sampling that wavelength interval is Λ to the light transmission features curve of testing sample, store N number of sampling light intensity data with ccd detector linear array record; Carry out N section parallel scan, sampling and data storing by multi-wavelength light frequency shift technique to light transmission features curve to be measured, the wavelength shift frequency amount of step-scan is Δ λ; Finally complete CCD sense data by computing machine to reset, realize N section spectrum zero-clearance and connect, reproduce complete testing sample absorption spectra.
2. a kind of method realizing near infrared color dispersion-type spectroanalysis instrument ultrahigh resolution according to claim 1, is characterized in that, described ccd detector linear array record also stores N number of sampling light intensity data and is specially:
Pass through dispersion element, the N number of multi-wavelength light beam containing determinand spectral information is made to carry out spatial dispersion, and by imaging system, N number of multi-wavelength light beam is imaged in N number of CCD pixel of ccd detector linear array, at synchronization, N number of CCD pixel records the light intensity magnitude of N number of multi-wavelength light beam corresponding with it respectively, and storage data; After N number of multi-wavelength light beam of light source is by accurate shift frequency Δ λ, N number of CCD pixel records and light intensity data after storing new shift frequency again simultaneously; By that analogy, until shift frequency scope covers a multi-wavelength interval Λ.
3. a kind of method realizing near infrared color dispersion-type spectroanalysis instrument ultrahigh resolution according to claim 1, is characterized in that, the length scanning mode that described method adopts is:
Multi-wave length parallel scans, and namely uses the multi wave length illuminating source that wavelength interval is equal, its role is to convert Single wavelength scanning mode in existing spectrometer technology to N number of multi-wave length parallel scan mode.
4. a kind of method realizing near infrared color dispersion-type spectroanalysis instrument ultrahigh resolution according to claim 1, is characterized in that, described multi wave length illuminating source adopts linewidth narrowing technology, and described linewidth narrowing technology is:
Continuous light multi-wavelength live width narrows technology simultaneously, by common multi wave length illuminating source after amplifying, high non-linearity four-wave mixing effect is utilized to produce more wavelength, multi-wavelength live width is narrowed again through stimulated Brillouin scattering, the live width of each wavelength is made all to be less than the spectral resolution estimating realization, thus be met the wide region of spectral resolution requirement, the frequency comb light source of narrow linewidth, as the light source of ultrahigh resolution color dispersion-type spectroanalysis instrument.
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| CN110530609A (en) * | 2019-08-28 | 2019-12-03 | 中国科学院合肥物质科学研究院 | The device and method for surveying FP transmittance curve using Whispering-gallery-mode laser light source |
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| CN106768896A (en) * | 2017-01-20 | 2017-05-31 | 南京航空航天大学 | Ultrahigh resolution light vector analysis method and device |
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| CN110530609A (en) * | 2019-08-28 | 2019-12-03 | 中国科学院合肥物质科学研究院 | The device and method for surveying FP transmittance curve using Whispering-gallery-mode laser light source |
| CN110530610A (en) * | 2019-08-28 | 2019-12-03 | 中国科学院合肥物质科学研究院 | The device and method of FP polarization characteristic is surveyed using the laser light source of Whispering-gallery-mode |
| WO2021036167A1 (en) * | 2019-08-28 | 2021-03-04 | 中国科学院合肥物质科学研究院 | Apparatus for measuring fp transmittance curve using whispering gallery mode laser light source, and method |
| US11313760B2 (en) | 2019-08-28 | 2022-04-26 | Hefei Institute of Physical Science, Chinese Academy of Sciences | Device and method for measuring transmittance curve of Fabry-Parot using whispering gallery mode laser source |
| CN117723155A (en) * | 2024-02-18 | 2024-03-19 | 深圳市深视智能科技有限公司 | Color sensor |
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