CN203011532U - Static two-channel Doppler heterodyne interferometer - Google Patents
Static two-channel Doppler heterodyne interferometer Download PDFInfo
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- CN203011532U CN203011532U CN 201220719849 CN201220719849U CN203011532U CN 203011532 U CN203011532 U CN 203011532U CN 201220719849 CN201220719849 CN 201220719849 CN 201220719849 U CN201220719849 U CN 201220719849U CN 203011532 U CN203011532 U CN 203011532U
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Abstract
The utility model provides a static binary channels Doppler heterodyne interferometer to realize the measurement of two central wavelength target spectral line Doppler frequency shifts. The interferometer comprises an interferometer entrance pupil, a collimation system, a beam splitter prism, a blazed grating component, a fringe imaging system and a detector array, wherein the core component of the beam splitter prism is 50: 50 depolarization beam splitting membrane that semi-reflecting is half passed through, stripe imaging system include preceding mirror group and back mirror group, and the blazed grating subassembly includes: the interferometer comprises a first blazed grating, a second blazed grating, a third blazed grating and a fourth blazed grating which are respectively arranged on a reflection light path, wherein the normals of working surfaces of the four gratings and corresponding incident optical axes form Littrow angles, the first blazed grating, the third blazed grating, the second blazed grating and the fourth blazed grating form corresponding working gratings to achieve interference of respective wavelengths, and the difference of distances from the centers of the working surfaces of the gratings corresponding in each group to the center of a beam splitting prism along the light path forms the basic optical path difference of the interferometer.
Description
Technical field
The utility model relates to a kind of Doppler's heterodyne ineterferometer.
Background technology
One, the mathematical expression of the ultimate principle of Doppler's heterodyne ineterferometer
The atmospheric wind measuring media is the atmospheric particles spectral line that has carried wind field information.According to the Doppler effect, during with air motion, the core frequency will produce frequency displacement, i.e. Δ λ/λ=Δ σ/σ=v/c when atmospheric particles.Can be finally inversed by the movement velocity of atmosphere according to above-mentioned relation by the Doppler frequency displacement of particle detection radiant rays.
Doppler's heterodyne ineterferometer adopts two blazed gratings to replace the plane mirror of Michelson interferometer two arms, and introduce certain base light path difference Δ d between interferometer two arms, there is the emerging wavefront of two β in a certain angle (the β size is relevant with wave number σ) at interferometer emergent pupil place, these two emerging wavefronts mutually superpose and produce Fizeau type interference fringe and be imaged on detector, and the spatial frequency of striped is this wave number σ and heterodyne wave number σ
LThe function of the difference of (corresponding β=0 °), as the formula (1).
When there is the Doppler frequency displacement that air motion causes in incident target spectral line, Δ σ/σ=v/c, interference function (1) becomes:
In detector pixel x=0 position, phase changing capacity:
By formula (3) as seen, as long as obtain respectively without the Doppler frequency displacement and basic light path location conflicts curve phase place when having the Doppler frequency displacement, can be finally inversed by air speed value.
Two, existing research situation
Doppler's heterodyne spectral technique is proposed by US Naval Research Laboratory the earliest, and scheme as shown in Figure 1.The Doppler shift of a passage (or centre wavelength) target spectral line can only be measured by this system.Usually the passive atmospheric wind stellar interferometer of ground (Fabry-Perot interferometer) that adopts can be measured the target spectral line Doppler shift of two centre wavelengths, but the processing of Fabry-Perot interferometer, assembly technology are had relatively high expectations, and instrument is stable not ideal enough.
The utility model content
The utility model provides a kind of static binary channels Doppler's heterodyne ineterferometer, to realize the measurement of two centre wavelength target spectral line Doppler shifts.
For realizing above utility model purpose, the utility model provides following basic technical scheme.
Static binary channels Doppler heterodyne ineterferometer comprises interferometer entrance pupil, colimated light system, beam splitter prism, blazed grating assembly, striped imaging system and detector array, and wherein the core component of beam splitter prism is the depolarization spectro-film of 50:50 half-reflection and half-transmission; Described striped imaging system comprises front lens group and rear mirror group, and the back focal plane of front lens group overlaps with the front focal plane of rear mirror group; It is characterized in that:
Be respectively arranged with the first visual field prism group and the second visual field prism group on the transmitted light path of beam splitter prism and reflected light path, each visual field prism group forms by two visual field prism cementings, and is coated with dichroic coating at cemented surface;
Described blazed grating assembly comprises: the first blazed grating, the second blazed grating that arrange respectively on the transmitted light path of the dichroic coating of the first visual field prism group, reflected light path, and the 3rd blazed grating, the 4th blazed grating that arrange respectively on the transmitted light path of the dichroic coating of the second visual field prism group, reflected light path; The workplace normal of four blazed gratings all becomes Littrow angle (θ with corresponding incident light axis
L), the grating line perpendicular direction is in described workplace normal and corresponding incident light axis determined plane (namely as shown in the figure paper); Wherein the first blazed grating and the 3rd blazed grating consist of one group of corresponding work grating realizing the interference of a wavelength, and one group of corresponding work grating of the second blazed grating and the 4th blazed grating formation is to realize the interference of another wavelength; The difference of the distance of the grating workplace center of every group of corresponding work grating along light path to the beam splitter prism center forms the base light path difference of this static state binary channels Doppler heterodyne ineterferometer;
Be provided with a color separation film on the emitting light path of striped imaging system, being disposed with centre wavelength at the transmitted light path of color separation film is λ
1The first bandpass filter, the first detector array, being disposed with centre wavelength on the reflected light path at color separation film is λ
2The second bandpass filter, the second detector array;
Described dichroic coating and color separation film are all for spectral range λ
a～λ
bIncident beam be divided into λ
a~ λ
iTransmission and λ
i~ λ
bThe reflection two light beams, described central wavelength lambda
1, λ
2Be in respectively wavelength band λ
a~ λ
iAnd λ
i~ λ
bIn.
Based on above-mentioned basic technical scheme, the utility model also can be done following optimization and limit and improve:
Above-mentioned two visual field prism groups are glued together with transmissive side and the reflection side of Amici prism respectively, and two visual field prism groups form the base light path difference of this binary channels Doppler heterodyne ineterferometer near the thickness difference of cemented surface position.
Perhaps, one of above-mentioned two visual field prism groups are glued together with Amici prism, and the gap thickness that does not leave with the visual field prism group of Amici prism gummed forms the base light path difference of this binary channels Doppler heterodyne ineterferometer.
Owing to having adopted dichroic coating, the position of above-mentioned beam splitter prism preferably makes input light with the light splitting surface of 45 ° of incident beam splitter prisms.
Above-mentioned striped imaging system can adopt the 4f system.
Above-mentioned colimated light system is transmission-type system or reflect system.
Sum up the utility model advantage as follows:
Adopt scheme of the present utility model, measure when the separate unit instrument can be realized two centre wavelength target spectral line Doppler shifts.
Compare with the Fabry-Perot interferometer, the processing of instrument of the present utility model, assembly technology require greatly to reduce, and good stability.
This interferometer structure is stable, the total system movement-less part.
Description of drawings
Fig. 1 is the structural representation of Doppler's difference interference spectrometer of prior art.
Fig. 2 is the structural representation of static binary channels Doppler's differential interferometer of the present utility model.
Embodiment
Static binary channels Doppler's heterodyne ineterferometer of the present utility model is comprised of preset lens, interferometer entrance pupil, collimating mirror, beam splitter prism, visual field prism (cemented surface arranges dichroic coating), blazed grating, striped imaging system, color separation film, bandpass filter and detector.
1) preset lens: effect is collect the radiation of target and converge on its back focal plane.
2) interferometer entrance pupil: be positioned on the front focal plane of preset lens back focal plane and collimating mirror, effect is the field angle of controlling interferometer.
3) colimated light system: will become parallel beam by the light beam of interferometer entrance pupil.
4) beam splitter prism: its core is the depolarization spectro-film of 50:50 half-reflection and half-transmission, incident parallel beam equal strength is divided into transmission and reflection two bundles, and the polarization characteristic of every a branch of directional light is all identical with the incident directional light.
5) visual field prism: four visual field prisms divide two groups to compose one, and cemented surface is coated with dichroic coating, and dichroic coating is with spectral range λ
a~ λ
bIncident beam be divided into λ
a～λ
iTransmission and λ
i~ λ
bThe reflection two light beams; Again that two groups of prisms and Amici prism are glued together.Two groups of visual field prisms form the base light path difference (Δ d) of interferometer along the thickness difference of optical axis direction.
6) blazed grating: in native system, the workplace normal of four blocks of gratings becomes Littrow angle (θ with incident light axis
L), the grating line perpendicular direction is in paper, and through after grating dispersion, the different wave length bundle returns from grating with different angle of diffraction β.
7) striped imaging system: by imaging lens L
1With imaging lens L
2Form, effect is that interferogram is imaged onto on the area array CCD detector.
8) color separation film: with spectral range λ
a~ λ
bIncident beam be divided into λ
a~ λ
iTransmission and λ
i~ λ
bThe reflection two light beams is surveyed by two detector arrays respectively.The central wavelength lambda of above-mentioned bandpass filter
1, λ
2Be in respectively two wavelength band λ
a～λ
iAnd λ
i~ λ
bIn.
9) bandpass filter: being respectively arranged with centre wavelength on the reflected light path of color separation film and transmitted light path is λ
1, λ
2Bandpass filter, bandwidth is nanometer scale (2 ~ 3nm).
10) detector array: be respectively arranged with two area array CCDs on the reflected light path of color separation film and transmitted light path, be used for receiving corresponding interferogram.
The principle of work of static binary channels Doppler's differential interferometer of the present utility model is: telescopic system is collected the spectral radiance of observed object, and it is imaged onto on the telescope focal plane; Become parallel beam through the target emanation of diaphragm after colimated light system and incide beam splitter prism, be divided into transmission and reflection two-way and incide dichroic coating in the prism of corresponding visual field; Dichroic coating tells two wavelength coverage transmissions respectively, reflex to corresponding blazed grating, through the light beam of dichroic coating transmission or reflection all with Littrow angle (θ
L) incide respectively on blazed grating; The different wave length bundle is reflected back on dichroic coating from grating with different angle of diffraction after the blazed grating dispersion.Through the beam splitter prism half-reflection and half-transmission, again told transmitted light, the reflected light of different-waveband scope by color separation film on the emitting light path of striped imaging system again, and converge into outgoing beam through corresponding bandpass filter in the interferometer outlet respectively.
For an incident corrugated, there are two outgoing corrugateds that certain angle is arranged like this, have the coherence between these two corrugateds.Striped imaging system L
1Outgoing beam is assembled, obtained the picture of the interferometer entrance pupil of the corresponding different wave length that produced by two blazed grating dispersions on its focal plane.Striped imaging system L
2Again with beam collimation, interfere on its back focal plane from the light beam of interferometer two arms, interferogram is detected the device array received.In addition, due to the existence of base light path difference, make detector center pixel have certain basic phase place, can obtain the Doppler shift of incident light spectrum radiation by the variation of Fundamentals of Measurement phase place.In the utility model, the interferogram of two passages (corresponding to two centre wavelengths) can be surveyed by the area array CCD of correspondence simultaneously and obtain.
Claims (6)
1. static binary channels Doppler's heterodyne ineterferometer, comprise interferometer entrance pupil, colimated light system, beam splitter prism, blazed grating assembly, striped imaging system and detector array, and wherein the core component of beam splitter prism is the depolarization spectro-film of 50:50 half-reflection and half-transmission; Described striped imaging system comprises front lens group and rear mirror group, and the back focal plane of front lens group overlaps with the front focal plane of rear mirror group; It is characterized in that:
Be respectively arranged with the first visual field prism group and the second visual field prism group on the transmitted light path of beam splitter prism and reflected light path, each visual field prism group forms by two visual field prism cementings, and is coated with dichroic coating at cemented surface;
Described blazed grating assembly comprises: the first blazed grating, the second blazed grating that arrange respectively on the transmitted light path of the dichroic coating of the first visual field prism group, reflected light path, and the 3rd blazed grating, the 4th blazed grating that arrange respectively on the transmitted light path of the dichroic coating of the second visual field prism group, reflected light path; The workplace normal of four blazed gratings all becomes Littrow angle (θ with corresponding incident light axis
L), the grating line perpendicular direction is in described workplace normal and the determined plane of corresponding incident light axis; Wherein the first blazed grating and the 3rd blazed grating consist of one group of corresponding work grating realizing the interference of a wavelength, and one group of corresponding work grating of the second blazed grating and the 4th blazed grating formation is to realize the interference of another wavelength; The difference of the distance of the grating workplace center of every group of corresponding work grating along light path to the beam splitter prism center forms the base light path difference of this static state binary channels Doppler heterodyne ineterferometer;
Be provided with a color separation film on the emitting light path of striped imaging system, being disposed with centre wavelength at the transmitted light path of color separation film is λ
1The first bandpass filter, the first detector array, being disposed with centre wavelength on the reflected light path at color separation film is λ
2The second bandpass filter, the second detector array;
Described dichroic coating and color separation film are all for spectral range λ
a～λ
bIncident beam be divided into λ
a~ λ
iTransmission and λ
i~ λ
bThe reflection two light beams, described central wavelength lambda
1, λ
2Be in respectively wavelength band λ
a~ λ
iAnd λ
i~ λ
bIn.
2. static binary channels Doppler's heterodyne ineterferometer according to claim 1, it is characterized in that: described two visual field prism groups are glued together with transmissive side and the reflection side of Amici prism respectively, and two visual field prism groups form the base light path difference of this binary channels Doppler heterodyne ineterferometer near the thickness difference of cemented surface position.
3. static binary channels Doppler's heterodyne ineterferometer according to claim 1, it is characterized in that: one of described two visual field prism groups are glued together with Amici prism, and the gap thickness that does not leave with the visual field prism group of Amici prism gummed forms the base light path difference of this binary channels Doppler heterodyne ineterferometer.
According to claim 1 to 3 arbitrary described static binary channels Doppler's heterodyne ineterferometer, it is characterized in that: the position of described beam splitter prism arranges satisfies input light with the light splitting surface of 45 ° of incident beam splitter prisms.
5. static binary channels Doppler's heterodyne ineterferometer according to claim 4 is characterized in that: described striped imaging system adopts the 4f system.
6. static binary channels Doppler's heterodyne ineterferometer according to claim 5, it is characterized in that: described colimated light system is transmission-type system or reflect system.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063306A (en) * | 2012-12-24 | 2013-04-24 | 中国科学院西安光学精密机械研究所 | Static two-channel doppler heterodyne interferometer |
| CN104034421A (en) * | 2014-05-21 | 2014-09-10 | 中国科学院西安光学精密机械研究所 | Double-field-of-view Doppler heterodyne interferometer |
| CN104977692A (en) * | 2015-06-24 | 2015-10-14 | 中国科学院西安光学精密机械研究所 | Optical axis determining method in cemented lens centering processing |
| CN106289380A (en) * | 2016-10-19 | 2017-01-04 | 北醒（北京）光子科技有限公司 | A kind of new type superthin coaxial light source detection system |
| CN106546335A (en) * | 2016-11-17 | 2017-03-29 | 中国电子科技集团公司第四十研究所 | A kind of dual pathways Fourier spectrometer and detection method |
| CN108593108A (en) * | 2018-05-17 | 2018-09-28 | 深圳市太赫兹科技创新研究院 | Spectrometer |
| CN109374133A (en) * | 2018-09-29 | 2019-02-22 | 中国科学院光电技术研究所 | Asymmetric spatial heterodyne spectrometer based on improved K star-ster prism |
-
2012
- 2012-12-24 CN CN 201220719849 patent/CN203011532U/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063306A (en) * | 2012-12-24 | 2013-04-24 | 中国科学院西安光学精密机械研究所 | Static two-channel doppler heterodyne interferometer |
| CN103063306B (en) * | 2012-12-24 | 2015-03-11 | 中国科学院西安光学精密机械研究所 | Static two-channel doppler heterodyne interferometer |
| CN104034421A (en) * | 2014-05-21 | 2014-09-10 | 中国科学院西安光学精密机械研究所 | Double-field-of-view Doppler heterodyne interferometer |
| CN104034421B (en) * | 2014-05-21 | 2015-12-09 | 中国科学院西安光学精密机械研究所 | Double-field-of-view Doppler heterodyne interferometer |
| CN104977692A (en) * | 2015-06-24 | 2015-10-14 | 中国科学院西安光学精密机械研究所 | Optical axis determining method in cemented lens centering processing |
| CN106289380A (en) * | 2016-10-19 | 2017-01-04 | 北醒（北京）光子科技有限公司 | A kind of new type superthin coaxial light source detection system |
| CN106289380B (en) * | 2016-10-19 | 2019-06-25 | 北醒（北京）光子科技有限公司 | A kind of new type superthin coaxial light source detection system |
| CN106546335A (en) * | 2016-11-17 | 2017-03-29 | 中国电子科技集团公司第四十研究所 | A kind of dual pathways Fourier spectrometer and detection method |
| CN106546335B (en) * | 2016-11-17 | 2018-04-03 | 中国电子科技集团公司第四十一研究所 | A kind of binary channels Fourier spectrometer and detection method |
| CN108593108A (en) * | 2018-05-17 | 2018-09-28 | 深圳市太赫兹科技创新研究院 | Spectrometer |
| WO2019218807A1 (en) * | 2018-05-17 | 2019-11-21 | 深圳市太赫兹科技创新研究院 | Spectrometer |
| CN109374133A (en) * | 2018-09-29 | 2019-02-22 | 中国科学院光电技术研究所 | Asymmetric spatial heterodyne spectrometer based on improved K star-ster prism |
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