CN208012761U - A kind of wide spectrum high-resolution spectra interferometric measuring means - Google Patents
A kind of wide spectrum high-resolution spectra interferometric measuring means Download PDFInfo
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- CN208012761U CN208012761U CN201820355201.7U CN201820355201U CN208012761U CN 208012761 U CN208012761 U CN 208012761U CN 201820355201 U CN201820355201 U CN 201820355201U CN 208012761 U CN208012761 U CN 208012761U
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Abstract
Include the first dispersion system, image slicer, the first concentration module, the second collimating module, intervention module, light compression module, third collimating module, the second dispersion system and the detector set gradually along light path the utility model is related to a kind of wide spectrum high-resolution spectra interferometric measuring means；After target light is collimated first in dispersion to detector row pixel or row pixel；Then conplane different location is reflexed to according to different spectral coverage；Enter intervention module after the reflected beams are collimated again and obtains interference fringe；Interference fringe is compressed along with interference fringe vertical direction again；Compressed interference fringe is finally subjected to secondary dispersion along detector row pixel direction or row pixel direction, obtains high-resolution spectra interference fringe.The interference of wide spectrum high-resolution spectroscopy is solved the problems, such as by detector row or column pixel number is limited, crossed dispersion leads to line bend etc., realizes a kind of wide spectrum, high-precision, the radial velocity detecting strategy of high s/n ratio.
Description
Technical field
The utility model belongs to field of optical detection, more particularly to a kind of wide spectrum high-resolution spectra interferometric measuring means.
Background technology
Spectrographic detection technology is to obtain the structure of matter and chemical composition, material element assay and research atomic energy
Grade, the important means of optical signalling frequency displacement detection, at present in industrial and agricultural production, scientific research, environmental monitoring, aerospace
The fields such as remote sensing, astronomical observation have a wide range of applications.Interferometry technology be in optical measurement most widely used technology it
One, it is the important hand for realizing the technologies such as precision distance measurement, signal detection, laser lithography, optics regulation and control, Atmospheric components measurement
Section, application field are extensive.The dispersion delayed interference technology that spectrum and interference are combined is applied as a kind of new measuring technique
In the measurement of the radial velocity, and it is outer fixed star feature detection that radial velocity method, which is, is outer planet detection, the inspection of universe small-signal
It surveys, one of main method used such as air Wind field measurement on the middle and senior level.
Currently, there are two types of the main technique methods of realization radial velocity method：It is a kind of to utilize high-resolution crossed dispersion ladder
Grating spectrograph, another kind utilize the dispersive spectrometer that is concerned with.The former core component is high-resolution echelon；The latter then by
One interferometer and rear Dispersive Devices composition.The main distinction of both measurement methods is that the former passes through high-resolution ladder light
Grid realize high level diffraction, realize that spectral coverage broadens using multiple diffraction times, reach wide spectrum height using prism crossed dispersion
Resolution spectrum calculates regarding for fixed star by directly measuring the position movement because of the stellar spectrum spectral line that Doppler effect generates
To velocity information；And the latter is to be obtained fixed star light by interferometer by the method for middle dispersion or low dispersion grid dispersion
Interference fringe carries out dispersion, and radial velocity information is calculated by the phase shift of interference fringe.Both instruments are being layman
Talent scout survey side, atmospheric wind test the speed aspect with respective advantage, the former spectral resolution is high, directly measures the light for obtaining target
Modal data, data are intuitive, calculate simple；But high dispersion causes the energy of the reception of single detector pixel weak, system signal noise ratio
Low, simultaneously as the dispersive power to different wave length light wave is different, crossed dispersion causes line bend more serious, leads
The increase of observation error is caused, and high-precision crossed dispersion detection system is very high to observing environment requirement, to greatly
Observation cost is increased, limits the development of the technology from every side.The latter's spectral resolution is low, single pixel receive energy compared with
Height, signal-to-noise ratio are high, and the displacement of stellar spectrum is transformed into the variation of interference fringe phase by interferometer, and larger interference light path
Difference realizes the amplification to spectral shift amount, and requirement of the latter to observing environment is relatively low, and technology realizability is good；But the latter
Data processing it is more complicated, also, the latter during dispersion spectral accuracy and spectral region by detector row or column picture
The limitation of first quantity, leads to that spectral dispersion resolution ratio is low, observation spectrum narrow range.
Currently, solving the method that detector limits instrument spectral resolution ratio and spectral measurement ranges as row or column pixel quantity
It is：The scheme of low resolution grating+prism crossed dispersion in.But in this scheme, prism dispersion direction and striped side
To being identical, since prism is different the dispersive power of different wave length, during dispersion, different wave length can be made
Striped generates different size of amount of movement, and this move of stripe can pass through detector and sample, and detector can be caused to sample striped
Contrast declines.And the key point in relevant dispersion Detection Techniques is that the extraction of striped, contrast decline can seriously affect
The detection accuracy of instrument.On the other hand, crossed dispersion causes the bending direction of optic spectrum line consistent with interference fringe distribution direction,
It is this to be bent the variation for resulting in fringe phase, to which the phase change to interference fringe introduces the additional margin of error, into one
Step causes the reduction of measurement accuracy.
Utility model content
In order to overcome the above-mentioned deficiencies of the prior art, the utility model proposes a kind of interference of wide spectrum high-resolution spectra to fill
It sets.The interference of wide spectrum high-resolution spectroscopy is solved by detector row or column pixel number is limited, crossed dispersion leads to spectrum
The problem of Spectral line bend etc. realizes a kind of wide spectrum, high-precision, the radial velocity detecting strategy of high s/n ratio.
In order to solve the problems, such as that existing scheme exists, the utility model discloses a kind of interference of wide spectrum high-resolution spectra to survey
Amount method, includes the following steps：
Step 1：After target light is collimated in dispersion to detector row pixel or row pixel；
Step 2：It is same flat by being reflexed to according to different spectral coverage along the spectrum of detector row pixel or row pixel orientational dispersion
The different location in face；
Step 3：Interference fringe is obtained by intervention module is entered after the reflected beams collimation in step 2；
Step 4：Interference fringe is compressed along with interference fringe vertical direction；
Step 5：Compressed interference fringe in step 4 is carried out two along detector row pixel direction or row pixel direction
Secondary dispersion obtains high-resolution spectra interference fringe.
Preferably, above-mentioned target is single or multiple point light sources.
Wide spectrum high-resolution spectra interferometric measuring means provided by the utility model, are characterized in that：Including along light
The first dispersion system that road is set gradually, image slicer, the first concentration module, the second collimating module, intervention module, optical pressure contracting mould
Block, third collimating module, the second dispersion system and detector；
Above-mentioned first dispersion system includes the first collimating module and the first dispersion compensation module set gradually along light path；
Point target is extended to face directional light and is divided into the first dispersion compensation module by the first collimating module, the first dispersion mould
For block by face directional light along detector row pixel or row pixel orientational dispersion, dispersed light beam propagates to image slicer, and image slicer will
Dispersed light beam is cut, and so that different spectral coverage is reflected along different angle, reflection direction is perpendicular to the first dispersion compensation module dispersion direction；
First concentration module collimates after being converged the reflected beams of image slicer into the second collimating module, obtains different spectrums
The collimated light beam of section；The collimated light beam of different spectral coverage enters intervention module and obtains perpendicular to the dry of the first dispersion compensation module dispersion direction
Relate to striped；Light compression module passes through the interference fringe that intervention module is emitted after detector row pixel or the compression of row pixel direction
Enter the second dispersion system after third collimating module collimation, the second dispersion system is by directional light along detector row pixel or row pixel
Direction carries out secondary dispersion, and the interference fringe of each spectral coverage is obtained in detector different zones.
Preferably, between the first dispersion compensation module and image slicer can also include converging lenses, above-mentioned converging lenses for pair
The light beam of first dispersion compensation module is converged according to different spectral coverage.
Preferably, above-mentioned second dispersion system may include the second dispersion compensation module and the second optically focused set gradually along light path
Module；
Directional light is carried out secondary dispersion along detector row pixel or row pixel direction and gathered into second by the second dispersion compensation module
After optical module convergence, the interference fringe of each spectral coverage is obtained in detector different zones.
Preferably, above-mentioned second dispersion system can also be curved surface grating.
Preferably, the first dispersion compensation module and the second dispersion compensation module are grating or prism, can also use other one-dimensional dispersions
Element replaces, and the resolution ratio of the second dispersion compensation module is more than the resolution ratio of the first dispersion compensation module.
Preferably, above-mentioned first concentration module is convex lens or convex lens group, and the incident parallel light of different angle is converged
Gather in different spatial.
Preferably, above-mentioned second collimating module is micro lens group, and the light of different spectral coverage is collimated；Above-mentioned optical pressure contracting
Module is cylindrical mirror, and interference pattern is compressed along spectral dispersion direction.
Preferably, above-mentioned interference module is that Sagnac interferometers, Michelson's interferometer or Mach-Zehnder interferometer etc. are dry
Interferometer device.
The utility model has the beneficial effects that：
1, the spectrum widening under detector pixel limited situation is realized；
When grating is to target optical spectrum dispersion, in the case where detector row or column pixel number determines, spectral resolution and
Spectral dispersion range is inversely proportional, and cannot achieve high-resolution wide spectrum spectral measurement.Method used by the utility model is first
By grating or prism by target dispersion to detector row pixel, then will be along the spectral reflectance of row dispersion by image slice device
To Different Plane position so that different spectral coverage is arranged in detector difference row or column, then passes through high-resolution dispersion element
Narrow-band spectrum to being generally aligned in the same plane different row or column carries out secondary dispersion along the direction of row or column, obtains wide spectrum high-resolution
Rate optic spectrum line.
2, there is no bendings for each level dispersion line；
Dispersion direction is in the same direction twice for the utility model, during avoiding crossed dispersion, since prism is not to
The refractive index of co-wavelength light wave is different, after leading to echelon prism dispersion, caused by the spectral lines of different levels be bent on the detector
The phenomenon that.
3, it is convenient for miniaturization and lightweight；
Light path is reflected using image slice device so that whole light path is compacter in space layout, meanwhile, second
Dispersion uses grating dispersion, has smaller volume, lighter quality and the better linearity compared to prism.
4, the contrast of interference fringe is not influenced while spectrum widening；
The light of first time dispersion different spectral coverage is displaced to conplane different location by image slice device, makes its phase
It is mutually parallel, after being compressed along grating dispersion direction by cylindrical mirror, using second of dispersion of grating.The direction one of dispersion twice
Sample, and interference direction are vertical, therefore will not be affected to the contrast of interference fringe.
5, the program can be realized while Multiple targets observation；
Consider spectral resolution, many factors such as interference fringe number, dispersion phase responsibility outer planet detection system can
Once to realize the observation of multiple targets, by preset lens by the target of introducing in grating different location dispersion, by image
Food slicer reflects and secondary dispersion, makes the interference fringe arranged in parallel of different target, to realize Multiple targets observation.
Description of the drawings
Fig. 1 is the utility model one embodiment schematic device；
Fig. 2 is the second dispersion system schematic diagram；
Reference numeral is in figure：The first collimating modules of 1-, the first dispersion compensation modules of 2-, 3- image slicers, 4- the first optically focused moulds
Block, the second collimating modules of 5-, 6- intervention modules, 7- light compression modules, 8- third collimating modules, the second dispersion systems of 9-；
The second dispersion compensation modules of 91-, the second concentration modules of 92-.
Specific implementation mode
The utility model is further described below in conjunction with drawings and the specific embodiments.
The utility model is using the measurement method for interfering dispersion again after a kind of first dispersion, first, by target dispersion to detection
On device row pixel or row pixel direction；Secondly, it will cut and reflect according to different spectral coverage along the spectrum of detector row pixel dispersion
To conplane different location, spectrum widening is realized；Again, the different spectral coverage after segmentation is compressed into collimation, into interference mould
Block obtains interference fringe；Finally, interference fringe is subjected to secondary dispersion along detector row or column direction and realizes that high-precision is divided, obtained
It secures satisfactory grades and distinguishes spectral interference striped.
It can be measured by device shown in FIG. 1 in the embodiment, be can be seen that from Fig. 1 and Fig. 2 along light path successively
It is provided with the first collimating module 1, the first dispersion compensation module 2, image slicer 3, the first concentration module 4, the second collimating module 5, interference
Module 6, light compression module 7, third collimating module 8, the second dispersion system 9 and detector；In the first dispersion compensation module and as cutting
It can also include converging lenses between device, the light beam of the first dispersion compensation module is converged according to different spectral coverage.
The second dispersion system 9 includes the second dispersion compensation module 91 and the second optically focused set gradually along light path in this embodiment
Module 92 can also be replaced directly with curved surface grating；First dispersion compensation module 2 and the second dispersion compensation module 91 are grating, can also
With prism or other replaced with one-dimensional dispersion element；Image slicer 3 is made of the different plane mirror of angle, its main feature is that
Line or face are split, then reflected along different angle；First concentration module 4 converges the incident parallel light of different angle
Gather in different spatial, the equivalent optically focused light path of convex lens；Second collimating module 5 is cylindrical mirror or path-splitting micro lens；
Intervention module 6 can be Sagnac interferometers, Michelson's interferometer, the interference instrument such as Mach-Zehnder interferometer；Second dispersion
The resolution ratio of module 91 represents spectrometer true resolution, and second of dispersion is consistent with first time dispersion direction.
Specific measurement process is as follows：
1), wherein target is single or multiple point light sources, is imaged on focal plane by object lens, will by optical fiber or object lens
Target introduces the first collimating module 1, and then point target is extended to face directional light and is divided into the first dispersion compensation module 2.Pass through
First dispersion compensation module 2 will input directional light along detector row pixel or row pixel orientational dispersion, and dispersed light beam is propagated to as cutting
Device 3.
2), target dispersion spectral line is cut by image slicer 3, different spectral coverage is made to be reflected along different angle, reflection
Dispersion direction of the direction perpendicular to the first dispersion compensation module 2.
3), the reflection light of image slicer 3 is converged by the first concentration module 4, since 3 each ladder of image slicer is anti-
The angle for penetrating spectral coverage light is different, and different ladders correspond to wave band and are compressed in different spatial, and light beam enters second after compression
Collimating module 5.
4), incident beam is collimated by the second collimating module 5, obtains the collimated light beam of different spectral coverage, into dry
Relate to module 6.
5) interference, is carried out by intervention module 6 and obtains interference fringe, interference fringe direction is along detector column pixel or row picture
First directional spreding, perpendicular to first time dispersion direction.
6) energy centralization, is incident to by compression of images by third standard along first time dispersion direction by light compression module 7
Straight module 8.
7), incident beam is collimated by third collimating module 8, is divided into the second dispersion compensation module 91.
8), input directional light is entered the by the second dispersion compensation module 91 after carrying out secondary dispersion perpendicular to interference fringe direction
Two concentration modules 92.
9), after the second concentration module will converge, the interference fringe of each spectral coverage is obtained in detector different zones.
Claims (8)
1. a kind of wide spectrum high-resolution spectra interferometric measuring means, it is characterised in that：It include the first color set gradually along light path
The system of dissipating, image slicer, the first concentration module, the second collimating module, intervention module, light compression module, third collimating module, the
Two dispersion systems and detector；
First dispersion system includes the first collimating module and the first dispersion compensation module set gradually along light path；
Point target is extended to face directional light and is divided into the first dispersion compensation module by the first collimating module, and the first dispersion compensation module will
For face directional light along detector row pixel or row pixel orientational dispersion, dispersed light beam propagates to image slicer, and image slicer is by dispersion
Light beam is cut, and so that different spectral coverage is reflected along different angle, reflection direction is perpendicular to the first dispersion compensation module dispersion direction；First
Concentration module collimates after being converged the reflected beams of image slicer into the second collimating module, obtains different spectral coverage
Collimated light beam；The collimated light beam of different spectral coverage enters interference item of the intervention module acquisition perpendicular to the first dispersion compensation module dispersion direction
Line；The interference fringe that intervention module is emitted is passed through third by light compression module after detector row pixel or the compression of row pixel direction
Enter the second dispersion system after collimating module collimation, the second dispersion system is by directional light along detector row pixel or row pixel direction
Secondary dispersion is carried out, the interference fringe of each spectral coverage is obtained in detector different zones.
2. wide spectrum high-resolution spectra interferometric measuring means according to claim 1, it is characterised in that：In the first dispersion mould
Further include converging lenses between block and image slicer, the converging lenses be used for the light beam of the first dispersion compensation module according to different spectral coverage into
Row convergence imaging.
3. wide spectrum high-resolution spectra interferometric measuring means according to claim 2, it is characterised in that：
Second dispersion system includes the second dispersion compensation module and the second concentration module set gradually along light path；
Directional light is carried out secondary dispersion along detector row pixel or row pixel direction and enters the second optically focused mould by the second dispersion compensation module
After block convergence, the interference fringe of each spectral coverage is obtained in detector different zones.
4. wide spectrum high-resolution spectra interferometric measuring means according to claim 2, it is characterised in that：
Second dispersion system is curved surface grating.
5. wide spectrum high-resolution spectra interferometric measuring means according to claim 3, it is characterised in that：First dispersion compensation module
It is grating or prism with the second dispersion compensation module, the resolution ratio of the second dispersion compensation module is more than the resolution ratio of the first dispersion compensation module.
6. according to any wide spectrum high-resolution spectra interferometric measuring means of claim 1-5, it is characterised in that：Described
One concentration module is convex lens or convex lens group.
7. wide spectrum high-resolution spectra interferometric measuring means according to claim 6, it is characterised in that：Second collimation
Module is micro lens group；The smooth compression module is cylindrical mirror.
8. wide spectrum high-resolution spectra interferometric measuring means according to claim 7, it is characterised in that：The intervention module
For Sagnac interferometers, Michelson's interferometer or Mach-Zehnder interferometer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112097909A (en) * | 2020-07-31 | 2020-12-18 | 中国科学院国家天文台南京天文光学技术研究所 | Method and system for detecting optical path difference and tracking fringes of stellar light interference |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112097909A (en) * | 2020-07-31 | 2020-12-18 | 中国科学院国家天文台南京天文光学技术研究所 | Method and system for detecting optical path difference and tracking fringes of stellar light interference |
| CN112097909B (en) * | 2020-07-31 | 2022-10-11 | 中国科学院国家天文台南京天文光学技术研究所 | Method and system for detecting optical path difference of interference of constantlight and tracking fringes |
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