CN207675307U - Inteference imaging spectral apparatus based on rectangular raster dispersion shearing - Google Patents
Inteference imaging spectral apparatus based on rectangular raster dispersion shearing Download PDFInfo
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- CN207675307U CN207675307U CN201721391276.2U CN201721391276U CN207675307U CN 207675307 U CN207675307 U CN 207675307U CN 201721391276 U CN201721391276 U CN 201721391276U CN 207675307 U CN207675307 U CN 207675307U
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Abstract
The utility model discloses a kind of inteference imaging spectral apparatus based on rectangular raster dispersion shearing, include front end optical system, optical filter, double square grating shearing device, rear end image-forming objective lens, planar array detector and the signal processing system being sequentially placed along light path.The light beam of detection target each point enters front end optical system, forms collimated light beam；Collimated light beam passes through optical filter, and detecting band inner light beam subsequently enters double square grating shearing device, and collimated light beam is sheared by lateral dispersion；Then shearing light beam is imaged on by rear end image-forming objective lens on the target surface of planar array detector, obtains the two dimensional image for the target scene for carrying interference fringe；The interference fringe of each point in target scene is obtained by rotating double square grating shearing device or whole system, signal processing system handles to obtain high-resolution spectral signal in certain spectral by mathematical operations such as Fourier transformations.The utility model is simple in structure, compact, small.
Description
Technical field
The invention belongs to field of optical detection, and in particular to a kind of interference imaging spectral based on rectangular raster dispersion shearing
Device.
Background technology
Interference type imaging spectrometer reconstructs spectral information by detecting the interference fringe of target scene each point, has mostly logical
Road, high-throughput advantage, are particularly suitable for infrared band spectrographic detection.Interference spectrum technology utilizes spectroscopic data and its interference letter
Fourier transformation relationship between number, by detecting interference signal inverting spectral information.According to the characteristic of Fourier transformation, to improve
Restore the resolution ratio of spectrum, it is necessary to increase the optical path difference of interference fringe, inteference imaging spectrometer, which needs to increase, pushes away the stroke swept, meeting
Increase the complexity of Instrument Design, increases acquisition art data redudancy.
Interference spectrum technology and dispersion grating are combined, are not being increased by the spatial heterodyne spectroscopy that 90 years last century occurred
High-resolution spectral information can be obtained under the premise of adding interference fringe length.But spatial heterodyne spectroscopy can not be to mesh
Mark carries out imaging detection, is suitable only for point light source detection；And point light source light beam be extended to after interference system face battle array light it is direct
It projects in the battle array detection of face, causes the luminous flux that detector obtains relatively low, the signal-to-noise ratio of system is reduced, for weak radiation mesh
Mark, the spectrographic detection of especially astronomical target, will increase the burden of detector response sensitivity.
Invention content
The purpose of the present invention is to provide a kind of inteference imaging spectral apparatus based on rectangular raster dispersion shearing, can obtain
The interference fringe of the target scene of high s/n ratio is taken, and high-resolution spectral information can be obtained, extends inteference imaging spectrometer
Application field.
Realize that the technical solution of the object of the invention is：A kind of interference imaging spectral based on rectangular raster dispersion shearing
Device includes that the front end optical system being sequentially placed along optical path direction, optical filter, double square grating shearing device, rear end are imaged object
Mirror, planar array detector and signal processing system；Wherein, front end optical system includes the preposition imaging set gradually along optical path direction
Object lens, field stop and collimator objective, the image planes of preposition image-forming objective lens and the front focal plane of collimator objective overlap, and field stop is located at
The front focal plane of collimator objective；Double square grating shearing device is by the first rectangular raster and the second rectangular raster group perpendicular to optical axis
At the first rectangular raster and the second rectangular raster are parallel, and the groove direction of the first rectangular raster and the second rectangular raster is identical；
The target surface of planar array detector is located on the back focal plane of rear end image-forming objective lens；Signal processing system is connected with detector；All optics
Element is coaxially contour relative to substrate, i.e., coaxially contour relative to optical table or instrument base.
Light path trend is as follows：Detection objective emission or the light of reflection are imaged on by preposition image-forming objective lens in its image planes,
Detection viewing field range is determined by field stop and eliminates stray light, then passes through collimator objective, forms collimated light beam；Front-end optical
The collimated light beam that system is formed passes through optical filter, eliminates other wave band light beams, only detecting band light beam is allowed to pass through optical filter；With
The collimated light beam of detecting band passes through the first rectangular raster afterwards, and the collimated light beam of two beam different angle of diffraction is generated in ± 1 order of diffraction,
Then ± 1 diffraction collimated light beam forms two beam collimated light beams of same field angle, two beam directional lights after the second rectangular raster
There are lateral shears between beam, then shear light beam and are imaged on the target surface of planar array detector by rear end image-forming objective lens；Face battle array
Detector converts optical signal into electric signal, electric signal entering signal processing system.
The duty ratio of first rectangular raster is 0.5；To detect spectral coverage centre wavelength light beam normal incidence when, phase
Retardation is π or 3 π；The parameter specification of second rectangular raster is identical as the parameter specification of the first rectangular raster.
A kind of detection method of the inteference imaging spectral apparatus based on rectangular raster dispersion shearing, comprises the steps of：
The first step, the light for detecting objective emission or reflection is imaged on by preposition image-forming objective lens in its image planes, by visual field
Diaphragm determines detection viewing field range and eliminates stray light, then passes through collimator objective, forms collimated light beam；
Second step, the collimated light beam that front end optical system is formed pass through optical filter, eliminate other wave band light beams, only allow to visit
It surveys wave band light beam and passes through optical filter；
Third walks：Pass through the first rectangular raster by the collimated light beam of optical filter, generating two beam differences in ± 1 order of diffraction spreads out
The collimated light beam of firing angle, two beams that subsequent ± 1 diffraction collimated light beam forms same field angle after the second rectangular raster are parallel
Light beam, there are lateral shear between two beam collimated light beams, the size of horizontal shear capacity is related to light beam wavelength；
4th step：It is imaged onto by rear end image-forming objective lens by two beam directional lights of double square grating shearing device lateral shear
On the target surface of planar array detector, and the optical path difference with wavelength conversion is introduced, obtains carrying interference fringe on detector target surface
Target scene image, interference fringe optical path difference direction is vertical with the groove direction of the first rectangular raster, pass through rotate double square
Grating shearing device or rotation whole system push away sweeping to detection target can obtain taking under target each point difference optical path difference
Target interference image with interference information, and it is converted to electric signal entering signal processing system；
5th step, signal processing system from the electric signal received extract target each point difference optical path difference under interference number
According to after carrying out the processing such as Fourier transformation to interference data, the multispectral datacube of detection target being obtained, to obtain target
The high-resolution spectroscopy information of each point and the two-dimensional image information of each spectral coverage.
Compared with prior art, the present invention its remarkable advantage is：(1) high-resolution light in detection spectral coverage can be obtained
Spectrum information；(2) internal system has the advantages that high light flux, high spatial method resolution ratio without slit；(3) system structure it is simple,
It is compact, it is small.
Description of the drawings
Fig. 1 is the structural schematic diagram for the inteference imaging spectral apparatus sheared the present invention is based on rectangular raster dispersion.
Fig. 2 is the first rectangular raster structural schematic diagram of the present invention.
Specific implementation mode
Present invention is further described in detail below in conjunction with the accompanying drawings.
A kind of inteference imaging spectral apparatus based on rectangular raster dispersion shearing combined with Figure 1 and Figure 2, including along light path side
To be sequentially placed front end optical system 1, optical filter 2, double square grating shearing device 3, rear end image-forming objective lens 4, planar array detector 5
With signal processing system 6；Wherein, front end optical system 1 includes the preposition image-forming objective lens 11 set gradually along optical path direction, visual field
Diaphragm 12 and collimator objective 13, the image planes of preposition image-forming objective lens 11 and the front focal plane of collimator objective 13 overlap, field stop 12
In the front focal plane of collimator objective 13；Double square grating shearing device 3 is by perpendicular to the first rectangular raster 31 of optical axis and the second rectangle
Grating 32 forms, and the first rectangular raster 31 is parallel with the second rectangular raster 32, and the first rectangular raster 31 and the second rectangular raster
32 groove direction is identical；The target surface of planar array detector 5 is located on the back focal plane of rear end image-forming objective lens 4；Signal processing system 6 with
Detector 5 is connected；All optical elements are coaxially contour relative to substrate, i.e., coaxial etc. relative to optical table or instrument base
It is high.
Light path trend is as follows：Detection objective emission or the light of reflection are imaged on its image planes by preposition image-forming objective lens 11
On, detection viewing field range is determined by field stop 12 and eliminates stray light, then passes through collimator objective 13, forms collimated light beam；
The collimated light beam that front end optical system 1 is formed passes through optical filter 2, eliminates other wave band light beams, only detecting band light beam is allowed to pass through
Cross optical filter 2；The collimated light beam of subsequent detecting band passes through the first rectangular raster 31, and generating two beam differences in ± 1 order of diffraction spreads out
The collimated light beam of firing angle, two beams that subsequent ± 1 diffraction collimated light beam forms same field angle after the second rectangular raster 32 are flat
Row light beam, there are lateral shears between two beam collimated light beams, then shear light beam and are imaged on face battle array by rear end image-forming objective lens 4 and visit
It surveys on the target surface of device 5；Planar array detector 5 converts optical signal into electric signal, electric signal entering signal processing system 6.
Signal processing system 6 is from the interference data extracted in the electric signal received under target each point difference optical path difference, to dry
After relating to the processing such as data progress Fourier transformation, the multispectral datacube of detection target is obtained, to obtain target each point
The two-dimensional image information of high-resolution spectroscopy information and each spectral coverage.
A kind of detection method of the inteference imaging spectral apparatus based on rectangular raster dispersion shearing, realizes that step is：
The first step, the light for detecting objective emission or reflection is imaged on by preposition image-forming objective lens 11 in its image planes, by regarding
Field diaphragm 12 determines detection viewing field range and eliminates stray light, then passes through collimator objective 13, forms collimated light beam；
Second step, the collimated light beam that front end optical system 1 is formed pass through optical filter 2, eliminate other wave band light beams, only allow
Detecting band light beam passes through optical filter 2.
Third walks：Pass through the first rectangular raster 31 by the collimated light beam of optical filter 2, two beams are generated not in ± 1 order of diffraction
With the collimated light beam of the angle of diffraction, subsequent ± 1 diffraction collimated light beam forms the two of same field angle after the second rectangular raster 32
Beam collimated light beam, there are lateral shear between two beam collimated light beams, the size of horizontal shear capacity is related to light beam wavelength.
4th step：By 3 lateral shear of double square grating shearing device two beam directional lights by rear end image-forming objective lens 4 at
On picture to the target surface of planar array detector 5, and the optical path difference with wavelength conversion is introduced, obtains carrying interference on detector target surface
The target scene image of striped, interference fringe optical path difference direction are vertical with the groove direction of the first rectangular raster 31.Pass through rotation
Double square grating shearing device 3 or rotation whole system push away sweeping to detection target can obtain target each point difference optical path difference
Under carry the target interference image of interference information, and be converted to electric signal entering signal processing system 6；
5th step, signal processing system 6 from the electric signal received extract target each point difference optical path difference under interference number
According to after carrying out the processing such as Fourier transformation to interference data, the multispectral datacube of detection target being obtained, to obtain target
The high-resolution spectroscopy information of each point and the two-dimensional image information of each spectral coverage.
In conjunction with Fig. 2, the duty ratio of the first rectangular raster 31 is 0.5 in the present invention, i.e. a/b=0.5, a are rectangular rasters
Step width, b are the grating constants of rectangular raster.To detect spectral coverage centre wavelength light beam normal incidence when, phase-delay quantity
For π or 3 π；The parameter specification of second rectangular raster 32 is identical as the parameter specification of the first rectangular raster 31.
Device is all-optical device before inteference imaging spectral apparatus detector based on rectangular raster dispersion shearing, noiseless
Light, Electro-optical Modulation, method simple practical；Apparatus structure is compact, small；Without entrance slit, there is high target resolution, high pass
The advantages of amount；In the case where not increasing and pushing away and sweep travel condition, pass through the ginseng for changing the first rectangular raster 31 and the second rectangular raster 32
Number can obtain the detection high-resolution spectral information of target each point.
Claims (3)
1. a kind of inteference imaging spectral apparatus based on rectangular raster dispersion shearing, it is characterised in that：Including along optical path direction according to
Front end optical system (1), optical filter (2), double square grating shearing device (3), rear end image-forming objective lens (4), the face battle array of secondary placement are visited
Survey device (5) and signal processing system (6)；Wherein, front end optical system (1) includes the preposition imaging set gradually along optical path direction
Object lens (11), field stop (12) and collimator objective (13), before the image planes and collimator objective (13) of preposition image-forming objective lens (11)
Focal plane overlaps, and field stop (12) is located at the front focal plane of collimator objective (13)；Double square grating shearing device (3) is by perpendicular to optical axis
The first rectangular raster (31) and the second rectangular raster (32) composition, the first rectangular raster (31) and the second rectangular raster (32) put down
Row, and the first rectangular raster (31) is identical with the groove direction of the second rectangular raster (32)；The target surface of planar array detector (5) is located at
On the back focal plane of rear end image-forming objective lens (4)；Signal processing system (6) is connected with detector (5)；All optical elements are relative to base
Bottom is coaxially contour, i.e., coaxially contour relative to optical table or instrument base.
2. the inteference imaging spectral apparatus according to claim 1 based on rectangular raster dispersion shearing, which is characterized in that light
Road trend is as follows：Detection objective emission or the light of reflection are imaged on by preposition image-forming objective lens (11) in its image planes, by visual field
Diaphragm (12) determines detection viewing field range and eliminates stray light, then passes through collimator objective (13), forms collimated light beam；Front end light
The collimated light beam that system (1) is formed passes through optical filter (2), eliminates other wave band light beams, only detecting band light beam is allowed to pass through
Optical filter (2)；The collimated light beam of subsequent detecting band passes through the first rectangular raster (31), and it is different to generate two beams in ± 1 order of diffraction
The collimated light beam of the angle of diffraction, subsequent ± 1 diffraction collimated light beam form the two of same field angle after the second rectangular raster (32)
Beam collimated light beam, there are lateral shears between two beam collimated light beams, then shear light beam and are imaged on by rear end image-forming objective lens (4)
On the target surface of planar array detector (5)；Planar array detector (5) converts optical signal into electric signal, electric signal entering signal processing system
It unites (6).
3. the inteference imaging spectral apparatus according to claim 1 based on rectangular raster dispersion shearing, it is characterised in that：Institute
The duty ratio for stating the first rectangular raster (31) is 0.5；To detect spectral coverage centre wavelength light beam normal incidence when, phase-delay quantity
For π or 3 π；The parameter specification of second rectangular raster (32) is identical as the parameter specification of the first rectangular raster (31).
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107748009A (en) * | 2017-10-26 | 2018-03-02 | 邱卓然 | Inteference imaging spectral apparatus and its detection method based on rectangular raster dispersion shearing |
| CN109669270A (en) * | 2018-12-29 | 2019-04-23 | 贝耐特光学科技（昆山）有限公司 | A kind of optical electivity device and optical device |
| CN112198579A (en) * | 2020-11-11 | 2021-01-08 | 中国科学院长春光学精密机械与物理研究所 | Sky light background noise suppressor, optical search telescope and star sensor |
| CN113946034A (en) * | 2021-11-08 | 2022-01-18 | 中国科学院光电技术研究所 | Broadband chiral spectral analysis and large-field-of-view imaging system and design method |
-
2017
- 2017-10-26 CN CN201721391276.2U patent/CN207675307U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107748009A (en) * | 2017-10-26 | 2018-03-02 | 邱卓然 | Inteference imaging spectral apparatus and its detection method based on rectangular raster dispersion shearing |
| CN109669270A (en) * | 2018-12-29 | 2019-04-23 | 贝耐特光学科技（昆山）有限公司 | A kind of optical electivity device and optical device |
| CN112198579A (en) * | 2020-11-11 | 2021-01-08 | 中国科学院长春光学精密机械与物理研究所 | Sky light background noise suppressor, optical search telescope and star sensor |
| CN112198579B (en) * | 2020-11-11 | 2021-06-01 | 中国科学院长春光学精密机械与物理研究所 | Sky light background noise suppressor, optical search telescope and star sensor |
| CN113946034A (en) * | 2021-11-08 | 2022-01-18 | 中国科学院光电技术研究所 | Broadband chiral spectral analysis and large-field-of-view imaging system and design method |
| CN113946034B (en) * | 2021-11-08 | 2023-09-19 | 中国科学院光电技术研究所 | Broadband chiral spectrum analysis and large-view-field imaging system and design method |
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