CN110081978A - A kind of multispectral polarization imaging device of transient state and its imaging method - Google Patents
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- 230000010287 polarization Effects 0.000 title claims abstract description 63
- 238000003384 imaging method Methods 0.000 title claims abstract description 51
- 230000001052 transient effect Effects 0.000 title claims abstract description 20
- 230000003287 optical effect Effects 0.000 claims abstract description 37
- 238000003491 array Methods 0.000 claims abstract description 34
- 238000001228 spectrum Methods 0.000 claims abstract description 33
- 230000003595 spectral effect Effects 0.000 claims abstract description 24
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000003786 synthesis reaction Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 9
- 238000005259 measurement Methods 0.000 abstract description 7
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
- G01J3/0208—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using focussing or collimating elements, e.g. lenses or mirrors; performing aberration correction
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/12—Generating the spectrum; Monochromators
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/447—Polarisation spectrometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/12—Generating the spectrum; Monochromators
- G01J2003/1291—Generating the spectrum; Monochromators polarised, birefringent
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- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
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Abstract
The invention discloses a kind of multispectral polarization imaging device of transient state and its imaging method, which includes the image-forming objective lens set gradually, diaphragm, collimator objective, filter arrays, microlens array and planar array detector.Method is the following steps are included: incident light is imaged on diaphragm by image-forming objective lens, then is incident to filter arrays in the form of collimated light beam collimator objective；Collimated light beam is divided into the collimated light beam of multiple and different wave bands, and is incident on microlens array, and the position of optical filter and lenticule corresponds；Multi-beam collimation light beam is imaged on the different zones of planar array detector target surface through microlens array respectively, acquires the image on planar array detector, obtains the spectrum polarizing image of multiple wave bands；Using the spectrum polarizing image of collected multiple spectral coverages, chromatic spectrum polarization image is synthesized.The present invention is able to achieve the synchronous real-time measurement of detection target optical spectrum information and polarization information, and has many advantages, such as that compact-sized, complexity is low, integrated level is high, measurement efficiency is high.
Description
Technical field
The invention belongs to optical imagery field of detecting, the multispectral polarization imaging device of especially a kind of transient state and its imaging side
Method.
Background technique
Spectral polarization imaging technology is the novel optical that a kind of fusion of imaging technology, spectral technique and polarization technology are integrated
Detection Techniques, the technology can obtain the data hypercube of measured target, image information, each point including measured target
Spectral information and each spectral coverage polarization information.Spectral polarization imaging technology can detect normal optical instrument and can not obtain
Therefore the multidimensional optical information obtained has in fields such as Atmospheric Survey, biomedicine, target detection and identification and astronomical observations
Wide application prospect.
Currently, multispectral polarization imaging technology can be mainly divided into color dispersion-type, interference according to the difference of spectrum mode
Type and optical filtering type etc..The multispectral polarization imaging technology of color dispersion-type is using prism or grating as beam splitter, by entering by slit
It penetrates light to come by wavelength dispersion, then is imaged on slit on the different location of detector by wavelength by imaging system；Interference-type with
Interferometer is obtained the interference pattern of entrance slit using two-beam interference principle, then passes through Fourier transformation as beam splitter
The spectrum of slit out is restored from interference pattern.Color dispersion-type and the multispectral polarization imaging technology of interference-type are swept and sweeping by pushing away
Mode obtains the spectrum polarizing image information of two dimension target, very high to the stability requirement of platform, and obtains in same single exposure
Take the spectrum polarizing information of all spectral coverages.And using the multispectral polarization imaging technology of optical filtering type is added in polarization imaging optical path
Enter optical filter, it is currently used mainly to have liquid crystal tunable optical filter (Liquid Crystal Tunable Filter, LCTF)
With acousto-optic tunable filter (Acousto-Optic Tunable Filter, AOTF) two ways so that mechanism is simpler
Single, speed of detection faster, thus is widely applied.
Japanese national aeronautical laboratory proposes the spectral polarization imaging method based on spectral filtering and polarizing film rotation, should
Method introduces LCTF and realizes spectral modulation and Polarization Modulation, and system structure is compact, can be used for water pollution detection, agricultural disaster generaI investigation
Equal work.US Army research laboratory proposes the spectrum polarizing based on spectral filtering and liquid crystal phase retardation amount modulation technique
Imaging method, the system, as spectral filtering device, use Monolithic LC VR for phase delay time division modulation device using AOTF, should
Method uses automatically controlled adjusting, and detection efficient is high, but acousto-optical device is more sensitive to noise, and imaging signal to noise ratio is low.Xi'an ray machine institute
Thought based on spectral filtering and phase delay time division modulation can using two panels liquid crystal using LCTF as spectral filtering device
Changeable phases delayer (Liquid Crystal Variable Retarders, LCVR) is used as phase delay time division modulation device.
The fast axis direction of LCVR is fixed, and phase-delay quantity generates regularity variation with input voltage, during scanning imagery, is passed through
The control voltage for adjusting LCVR, making two panels LCVR tool, there are four types of different phase-delay quantities to combine, not finally by four groups of analysis
With the interference fringe information of Polarization Modulation state, the full Stokes Vector Message of the available each spectral coverage of imageable target.Middle north
University proposes a kind of novel spectral polarization imaging method based on AOTF and light ball modulator, using three light ball modulators into
Row difference frequency is modulated, tri- polarization parameters of I, Q and U in the available Stokes vector of single measurement, then by adjusting AOTF's
Transmission peak wavelength, the spectrum polarizing information of available detection target.Above method is using two kinds of optical devices of LCTF and AOTF
Spectrum is carried out, LCTF haves the shortcomings that at high cost, spectral-transmission favtor is low；And AOTF is more sensitive to noise, imaging letter
It makes an uproar than low.
Summary of the invention
The purpose of the present invention is to provide it is a kind of it is at low cost, compact-sized, performance is stable, imaging signal to noise ratio is high is able to achieve
The device and method of target optical spectrum and polarization information real-time measurement.
The technical solution for realizing the aim of the invention is as follows: a kind of multispectral polarization imaging device of transient state, including along optical axis
Image-forming objective lens, diaphragm, collimator objective, filter arrays, microlens array and the planar array detector set gradually；The imaging object
The imaging surface of mirror is overlapped with the front focal plane of collimator objective；Diaphragm is located on the imaging surface of image-forming objective lens；The target surface of planar array detector
Positioned at the image planes position of microlens array；
The filter arrays include the optical filter of m coplanar different-waveband, and microlens array includes m coplanar phase
Same lenticule, and the position of optical filter and lenticule corresponds；
Incident light is imaged on diaphragm by image-forming objective lens, then filter is incident in the form of collimated light beam collimator objective
Filter Array is divided into the collimated light beam of m different-waveband, and it is corresponding micro- that m beam collimated light beam is incident on microlens array respectively
Lens are respectively imaged on the m regions being separated from each other of planar array detector target surface later.
A kind of multispectral polarization imaging method of transient state, comprising the following steps:
Step 1, incident light are imaged on diaphragm by image-forming objective lens, then are entered in the form of collimated light beam collimator objective
It is incident upon filter arrays；The filter arrays include the optical filter of m coplanar different-waveband；
Step 2, incident collimated light beam are divided into the collimated light beam of m beam different-waveband after filter arrays, and incident
To microlens array；The microlens array includes coplanar m identical lenticules, and the position one of optical filter and lenticule
One is corresponding；
Step 3, m beam collimated light beam are imaged on the different zones of planar array detector target surface respectively after microlens array, adopt
Collect the image on planar array detector, obtains the spectrum polarizing image of m wave band；
Step 4 utilizes the spectrum polarizing image of collected multiple spectral coverages, synthesis chromatic spectrum polarization image.
Compared with prior art, the present invention its remarkable advantage are as follows: 1) combined using filter arrays and microlens array
Form, single acquisition can obtain the spectrum picture of the multiple spectral coverages of target simultaneously, detection efficient height high with spectral-transmission favtor,
Advantage at low cost；2) polarization information of detection target can be obtained in real time, is had as planar array detector using polarization camera
The advantages of performance is stable, imaging signal to noise ratio is high, real time imagery；3) it is carried out in the form of filter arrays are in conjunction with polarization camera
Spectral polarization imaging detection, has the advantages that structure is simple, small in size, at low cost, suitable for some handheld instruments and small-sized
The various small-sized instrument imaging applications such as unmanned plane.
Present invention is further described in detail with reference to the accompanying drawing.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the multispectral polarization imaging device of transient state of the present invention.
Fig. 2 is 2 × 2 filter arrays structural schematic diagrams of the invention.
Fig. 3 is 2 × 2 microlens array structural schematic diagrams of the invention.
Specific embodiment
In conjunction with Fig. 1, a kind of multispectral polarization imaging device of transient state of the present invention, including the image-forming objective lens set gradually along optical axis
1, diaphragm 2, collimator objective 3, filter arrays 4, microlens array 5 and planar array detector 6；The imaging surface of the image-forming objective lens 1
It is overlapped with the front focal plane of collimator objective 3；Diaphragm 2 is located on the imaging surface of image-forming objective lens 1；The target surface of planar array detector 6 is located at micro-
The image planes position of lens array 5.
Filter arrays 4 include the optical filter of m coplanar different-waveband, and microlens array 5 includes coplanar m identical
Lenticule, and the position of optical filter and lenticule correspond；
Incident light is imaged on diaphragm 2 by image-forming objective lens 1, then incident in the form of collimated light beam collimator objective 3
To filter arrays 4, it is divided into the collimated light beam of m different-waveband, it is right that m beam collimated light beam is incident on microlens array 5 respectively
The lenticule answered respectively is imaged on the m regions being separated from each other of 6 target surface of planar array detector later.
Further, filter arrays 4, microlens array 5 are n × n array, m=n2。
It is further preferred that filter arrays 4, microlens array 5 are 2 × 2 arrays, m=4 in conjunction with Fig. 2, Fig. 3.
Further, filter arrays 4 include red band, green band, blue wave band and near infrared band optical filter.
It is exemplary preferably, red band, green band, blue wave band and near infrared band optical filter along clockwise or
Counterclockwise set gradually.
It is further preferred that planar array detector 6 is specifically using polarization camera.It is that micro- polarization arrays are arranged before target surface to make
For Polarization Modulation device, micro- polarization arrays are mainly made of several identical Polarization Modulation units.Each Polarization Modulation unit
Including the different linear polarization subelement in four polarization directions, while each subelement is again a pair of with the pixel of detector target surface one
It answers.By the signal of the same Polarization Modulation unit of combinatory analysis, the polarization information of the target point can be calculated, in conjunction with
The information of four spectrum channels realizes the synchronous real-time measurement of detection target optical spectrum information and polarization information.
A kind of multispectral polarization imaging method of transient state, comprising the following steps:
Step 1, incident light are imaged on diaphragm 2 by image-forming objective lens 1, then by collimator objective 3 with the shape of collimated light beam
Formula is incident to filter arrays 4；The filter arrays 4 include the optical filter of m coplanar different-waveband；
Step 2, incident collimated light beam are divided into the collimated light beam of m beam different-waveband after filter arrays 4, and incident
To microlens array 5；The microlens array 5 includes coplanar m identical lenticules, and the position of optical filter and lenticule
It corresponds；
Step 3, m beam collimated light beam are imaged on the different zones of 6 target surface of planar array detector respectively after microlens array 5,
The image on planar array detector 6 is acquired, the spectrum polarizing image of m wave band is obtained；
Step 4 utilizes the spectrum polarizing image of collected multiple spectral coverages, synthesis chromatic spectrum polarization image.
Further, filter arrays 4, microlens array 5 are n × n array, m=n2。
It is further preferred that n=2, filter arrays 4 include red band, green band, blue wave band and near-infrared wave
Section optical filter.
Further, spectrum polarizing image of the step 4 using collected multiple spectral coverages, synthesis chromatic spectrum polarization figure
Picture, specifically: using red band, green band, blue wave band spectrum polarizing image, synthesize chromatic spectrum polarization image.
The multispectral polarization imaging device of transient state of the invention and its imaging method, by by filter arrays, lenticule battle array
The form that column and polarization camera combine carries out spectral polarization imaging detection, can be realized detection target optical spectrum information and polarization letter
The synchronous real-time measurement of breath has many advantages, such as that compact-sized, complexity is low, integrated level is high, measurement efficiency is high.
Claims (10)
1. a kind of multispectral polarization imaging device of transient state, which is characterized in that including set gradually along optical axis image-forming objective lens (1),
Diaphragm (2), collimator objective (3), filter arrays (4), microlens array (5) and planar array detector (6)；The image-forming objective lens
(1) imaging surface is overlapped with the front focal plane of collimator objective (3)；Diaphragm (2) is located on the imaging surface of image-forming objective lens (1)；Face battle array is visited
The target surface for surveying device (6) is located at the image planes position of microlens array (5)；
The filter arrays (4) include the optical filter of m coplanar different-waveband, and microlens array (5) includes coplanar m
Identical lenticule, and the position of optical filter and lenticule corresponds；
Incident light is imaged on diaphragm (2) by image-forming objective lens (1), then is entered in the form of collimated light beam collimator objective (3)
Filter arrays (4) are incident upon, the collimated light beam of m different-waveband is divided into, m beam collimated light beam is incident on microlens array respectively
(5) corresponding lenticule is respectively imaged on the m regions being separated from each other of planar array detector (6) target surface later.
2. the multispectral polarization imaging device of transient state according to claim 1, which is characterized in that the filter arrays (4),
Microlens array (5) is n × n array, m=n2。
3. the multispectral polarization imaging device of transient state according to claim 2, which is characterized in that the n=2.
4. the multispectral polarization imaging device of transient state according to claim 3, which is characterized in that the filter arrays (4)
Including red band, green band, blue wave band and near infrared band optical filter.
5. the multispectral polarization imaging device of transient state according to claim 4, which is characterized in that the red band, green
The optical filter of wave band, blue wave band and near infrared band is set gradually clockwise or counterclockwise.
6. the multispectral polarization imaging device of transient state according to claim 5, which is characterized in that the planar array detector (6)
It is specific to use polarization camera.
7. a kind of multispectral polarization imaging method of transient state, which comprises the following steps:
Step 1, incident light are imaged on diaphragm (2) by image-forming objective lens (1), then by collimator objective (3) with collimated light beam
Form is incident to filter arrays (4)；The filter arrays (4) include the optical filter of m coplanar different-waveband；
Step 2, incident collimated light beam are divided into the collimated light beam of m beam different-waveband after filter arrays (4), and are incident on
Microlens array (5)；The microlens array (5) includes coplanar m identical lenticules, and the position of optical filter and lenticule
Set one-to-one correspondence；
Step 3, m beam collimated light beam are imaged on the different zones of planar array detector (6) target surface respectively after microlens array (5),
The image on planar array detector (6) is acquired, the spectrum polarizing image of m wave band is obtained；
Step 4 utilizes the spectrum polarizing image of collected multiple spectral coverages, synthesis chromatic spectrum polarization image.
8. the multispectral polarization imaging method of transient state according to claim 7, which is characterized in that the filter arrays (4),
Microlens array (5) is n × n array, m=n2。
9. the multispectral polarization imaging method of transient state according to claim 8, which is characterized in that the n=2, optical filter battle array
Arranging (4) includes red band, green band, blue wave band and near infrared band optical filter.
10. the multispectral polarization imaging method of transient state according to claim 9, which is characterized in that utilize acquisition described in step 4
The spectrum polarizing image of the multiple spectral coverages arrived, synthesize chromatic spectrum polarization image, specifically: using red band, green band,
The spectrum polarizing image of blue wave band synthesizes chromatic spectrum polarization image.
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| CN111007007A (en) * | 2019-11-30 | 2020-04-14 | 中国船舶重工集团公司第七一七研究所 | Switchable infrared spectrum polarization imaging device and measurement method thereof |
| CN111121967A (en) * | 2019-12-16 | 2020-05-08 | 南京理工大学 | Outdoor camouflage evaluation device and method based on multispectral imaging and image processing |
| CN111220270A (en) * | 2020-01-14 | 2020-06-02 | 安徽艾华测控技术有限公司 | Narrow-band spectral analysis system based on scanning galvanometer |
| CN111256820A (en) * | 2020-01-10 | 2020-06-09 | 南京理工大学 | Polarization multiplexing-based transient multispectral imaging device and method |
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