CN111272278A - Hyperspectral polarization imaging device and method adopting reflective phase retarder array - Google Patents
Hyperspectral polarization imaging device and method adopting reflective phase retarder array Download PDFInfo
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- CN111272278A CN111272278A CN202010024370.4A CN202010024370A CN111272278A CN 111272278 A CN111272278 A CN 111272278A CN 202010024370 A CN202010024370 A CN 202010024370A CN 111272278 A CN111272278 A CN 111272278A
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- 238000003384 imaging method Methods 0.000 title claims abstract description 59
- 230000010287 polarization Effects 0.000 title claims abstract description 41
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- 238000010008 shearing Methods 0.000 claims abstract description 15
- 238000001228 spectrum Methods 0.000 claims abstract description 14
- 230000003595 spectral effect Effects 0.000 claims abstract description 13
- 230000003287 optical effect Effects 0.000 claims description 20
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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
- G01J3/2823—Imaging spectrometer
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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
- G01J3/28—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
- G01J3/28—Investigating the spectrum
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- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/21—Polarisation-affecting properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
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Abstract
The invention discloses a hyperspectral polarization imaging device and method adopting a reflective phase retarder array, wherein the device comprises a front-mounted imaging objective lens, a diaphragm, a collimating objective lens, the reflective phase retarder array, a shearing interference component, a rear-mounted imaging objective lens and an area array detector which are sequentially arranged along the direction of a light path; incident light is imaged on a diaphragm through a front imaging objective lens and then is incident to a reflective phase retarder array through a collimating objective lens, the phase retarder array changes the phase retardation of collimated light beams and reflects the light beams to different directions, all the reflected light is interfered on an area array detector after sequentially passing through a shearing interference assembly and a rear imaging objective lens, and a plurality of spatially separated spectral interference images in different polarization states are formed. The method realizes hyperspectral polarization imaging based on the device. The invention adopts the reflective phase retarder array structure, can obtain the high-spectrum full-polarization information of the target in one-time push-sweeping process, and has the advantages of simple structure of the whole device, high luminous flux and good imaging quality.
Description
Technical Field
The invention belongs to the field of optical imaging, and particularly relates to a hyperspectral polarization imaging device and method adopting a reflective phase retarder array.
Background
The hyperspectral polarization imaging technology is an imaging spectrum technology which can simultaneously acquire the position information of a measured target in a scene, the spectrum curve of any point on the target and the polarization characteristic of the surface of an object, and can identify and detect the target which cannot be identified after the target space and the morphology information are acquired only through light intensity information in conventional optical detection.
At present, the hyperspectral polarization imaging devices are various in types, and if the hyperspectral polarization imaging devices are simply classified from the method used for polarization modulation in a system, the hyperspectral polarization imaging devices can be divided into three types, namely a time domain modulation type, a frequency domain modulation type and a spatial domain modulation type. The time domain modulation type is that imaging effects in different polarization states are obtained by rotating the rotatable polarization device, and hyperspectral full-polarization imaging is realized by measuring time sacrifice; the frequency domain modulation type is a channel phase modulator composed of a birefringent retarder and an analyzer, so that the polarization information can be determined from a single spectrum only, movable polarization components or differential components are not needed, the data processing difficulty is high, the system structure is complex, and high spectral resolution is difficult to obtain; the spatial domain modulation type divides the incident aperture by changing the angle of the polarizing element, simultaneously obtains four intensity images in different polarization states on the area array detector, and obtains target hyperspectral full-polarization information through calculation.
Disclosure of Invention
The invention aims to provide a hyperspectral full-polarization imaging device and a hyperspectral full-polarization imaging method which are simple in structure, high in luminous flux and good in imaging quality and can acquire target full-polarization information in a single push-broom process.
The technical solution for realizing the purpose of the invention is as follows: a hyperspectral polarization imaging device adopting a reflective phase retarder array comprises a front-mounted imaging objective lens, a diaphragm, a collimating objective lens, the reflective phase retarder array, a shearing interference component, a rear-mounted imaging objective lens and an area array detector which are sequentially arranged along the direction of a light path;
incident light from a target is imaged on a diaphragm through a front-mounted imaging objective lens, then forms collimated light beams through a collimating objective lens and is incident to a reflective phase retarder array, the reflective phase retarder array changes the phase retardation of the collimated light beams and reflects light with different phase retardation to different directions, all reflected light sequentially passes through a shearing interference assembly and a rear-mounted imaging objective lens and then interferes on an area array detector, and a plurality of spatially separated spectral interference images in different polarization states are formed.
Furthermore, the normal of each phase retarder in the reflective phase retarder array has an included angle with the XY plane, and the included angle between the ith phase retarder and the XY plane is recorded as αi，αiThe angle is acute, i is 0,1, …, N, N is the number of phase delay plates; the X axis is vertical to the plane of the optical axis, the Y axis is located on the plane of the optical axis and vertical to the X axis, and meanwhile, the positive direction of the Y axis is located in the direction of the reflected light of the reflective phase retarder array.
Further, the included angle between the normal of each phase retarder and the XY plane is the same.
Furthermore, an included angle exists between the fast axis of each phase retarder in the reflective phase retarder array and the YZ plane, and the included angle between the ith phase retarder and the YZ plane is recorded as thetaiAnd i is 0,1, …, N, wherein the Z-axis is the direction of the target incident light.
Further, the reflective retarder array comprises 4 retarders distributed in a 2 × 2 array.
Furthermore, each phase retarder is made of a birefringent material, one surface of each phase retarder is plated with an antireflection film, and the other surface of each phase retarder is plated with a high-reflection film.
Further, the shearing interference component comprises a polarizer, a first Savart crystal, a second Savart crystal and an analyzer which are sequentially arranged along the light path.
Further, the light transmission axis direction of the polarizer is vertical to the Z axis and forms an included angle of 45 degrees with the positive direction of the X axis; the optical axis direction of the first Savart crystal is perpendicular to the Y axis and forms an included angle of 45 degrees with the positive direction of the X axis; the optical axis direction of the second Savart crystal is perpendicular to the Y axis and the optical axis direction of the first Savart crystal; the transmission axis direction of the analyzer is parallel to the transmission axis direction of the polarizer.
Based on the imaging method of the hyperspectral polarization imaging device adopting the reflective phase retarder array, the method comprises the following steps:
step 1, incident light from a target is imaged on a diaphragm through an imaging objective lens, then forms collimated light beams through a collimating objective lens and is incident to a reflective phase retarder array;
step 4, extracting interference information of each point of the interference image sequence detection target and performing spectrum restoration to obtain the spectrum information of each target point; and (4) carrying out polarization restoration on the spectral interference images in all polarization states at the same moment, so as to obtain the full-polarization information of the target.
Compared with the prior art, the invention has the following remarkable advantages: 1) interference patterns in various polarization states can be obtained by once push-scanning, so that full-polarization information and spectral information of a measured target are recovered; 2) compared with the traditional spatial domain modulation spectrum polarization imaging scheme, the reflective phase retarder array structure is simple in structure and good in imaging quality, and is beneficial to improving the accuracy of spectrum restoration and polarization restoration.
The present invention is described in further detail below with reference to the attached drawing figures.
Drawings
FIG. 1 is a schematic structural diagram of a hyperspectral polarization imaging device adopting a reflective phase retarder array in an embodiment.
FIG. 2 is a schematic diagram illustrating a spatial structure of an embodiment of a reflective retarder array.
FIG. 3 is a schematic cross-sectional view of an embodiment of a phase retarder in a reflective phase retarder array.
FIG. 4 is a top view of an embodiment of an array of reflective retarders.
FIG. 5 is a schematic diagram of an interference image acquired on an area array detector in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In an embodiment, with reference to fig. 1, the present invention provides a hyperspectral polarized imaging apparatus using a reflective retarder array, including a pre-imaging objective lens 1, a diaphragm 2, a collimator objective lens 3, a reflective retarder array 4, a shearing interference component 5, a post-imaging objective lens 6, and an area array detector 7, which are sequentially arranged along a light path direction;
incident light from a target is imaged on a diaphragm 2 through a front-mounted imaging objective lens 1, then forms collimated light beams through a collimating objective lens 3 and enters a reflective phase retarder array 4, the reflective phase retarder array 4 changes the phase retardation of the collimated light beams and reflects light with different phase retardation to different directions, all reflected light sequentially passes through a shearing interference assembly 5 and a rear-mounted imaging objective lens 6 and then interferes on an area array detector 7, and a plurality of spatially separated spectral interference images in different polarization states are formed.
Further, in one embodiment, the normal of each retardation plate in the reflective retardation plate array 4 forms an angle with the XY plane, and it is noted that the angle between the ith retardation plate and the XY plane is αi，αiThe angle is acute, i is 0,1, …, N, N is the number of phase delay plates; the X axis is perpendicular to the plane of the optical axis, the Y axis is perpendicular to the X axis and the plane of the optical axis, and the positive direction of the Y axis is located in the direction of the reflected light of the reflective retarder array 4.
Further, in one embodiment, the normal of each phase retarder is at the same angle to the XY plane.
By adopting the scheme of the embodiment, the reflective phase retarder array is of a symmetrical structure, so that the adjustment is convenient, and the measurement efficiency is improved.
Further, in one embodiment, in conjunction with fig. 2, the reflective retarder array 4 includes 4 retarders distributed in a 2 × 2 array.
Further, in one embodiment, with reference to fig. 3, each retardation plate is made of a birefringent material, and one side of the retardation plate is coated with an antireflection film, and the other side of the retardation plate is coated with a high-reflection film.
Further, in one embodiment, referring to fig. 4, the fast axis of each retardation plate in the reflective retarder array 4 is included with the YZ plane, and the included angle between the ith retardation plate and the YZ plane is θiAnd i is 0,1, …, N, wherein the Z-axis is the direction of the target incident light.
Further, in one embodiment, the shearing interference component 5 includes a polarizer 5.1, a first Savart crystal 5.2, a second Savart crystal 5.3, and an analyzer 5.4, which are sequentially disposed along the optical path.
Further preferably, in one of the embodiments, the transmission axis direction of the polarizer 5.1 is perpendicular to the Z axis and forms an angle of 45 ° with the positive direction of the X axis; the optical axis direction of the first Savart crystal 5.2 is vertical to the Y axis and forms an included angle of 45 degrees with the positive direction of the X axis; the optical axis direction of the second Savart crystal 5.3 is perpendicular to both the Y-axis and the optical axis direction of the first Savart crystal 5.2; the transmission axis direction of the analyzer 5.4 is parallel to the transmission axis direction of the polarizer 5.1.
In one embodiment, the imaging method based on the hyperspectral polarization imaging device adopting the reflective phase retarder array comprises the following steps:
step 1, incident light from a target is imaged on a diaphragm 2 through an imaging objective lens 1, then forms collimated light beams through a collimating objective lens 3 and is incident to a reflective phase retarder array 4;
as a specific example, the reflective retarder array 4 includes 4 retarders distributed in a 2 × 2 array, all the reflected lights in step 2 sequentially pass through the shearing interference component 5 and the post-imaging objective 6 to interfere on the area array detector 7, and 4 spatially separated spectral interference sub-images in different polarization states are formed as shown in FIG. 5.
Step 4, the area array detector 7 obtains interference pattern information of the target under different polarization states, different positions in each sub-image correspond to different optical path differences, and the light intensity of each image point is modulated by different optical path differences at different moments through push scanning, so that interference information of each point of the target detected by the interference image sequence is extracted and spectrum restoration is carried out, and the spectrum information of each target point can be obtained; and (4) carrying out polarization restoration on the spectral interference images in all polarization states at the same moment, so as to obtain the full-polarization information of the target.
In summary, the invention adopts the reflective phase retarder array structure, can obtain the high spectrum full polarization information of the target in one push-broom process, and has the advantages of simple structure of the whole device, high luminous flux, good imaging quality and high spectrum restoration and polarization restoration precision.
Claims (9)
1. A hyperspectral polarization imaging device adopting a reflective phase retarder array is characterized by comprising a front imaging objective lens (1), a diaphragm (2), a collimating objective lens (3), the reflective phase retarder array (4), a shearing interference component (5), a rear imaging objective lens (6) and an area array detector (7) which are sequentially arranged along the direction of a light path;
incident light from a target is imaged on a diaphragm (2) through a front-mounted imaging objective lens (1), then forms collimated light beams through a collimating objective lens (3) and is incident to a reflective phase retarder array (4), the reflective phase retarder array (4) changes the phase retardation of the collimated light beams and reflects light with different phase retardation to different directions, all reflected light sequentially passes through a shearing interference assembly (5) and a rear-mounted imaging objective lens (6) and then interferes on an area array detector (7), and a plurality of spatially separated spectral interference images in different polarization states are formed.
2. The hyperspectral polarized imaging device adopting the reflective phase retarder array according to claim 1, wherein the normal of each phase retarder in the reflective phase retarder array (4) forms an included angle with the XY plane, and the included angle between the ith phase retarder and the XY plane is αi，αiThe angle is acute, i is 0,1, …, N, N is the number of phase delay plates; the X axis is vertical to the plane of the optical axis, the Y axis is located on the plane of the optical axis and vertical to the X axis, and meanwhile, the positive direction of the Y axis is located in the direction of the reflected light of the reflective phase retarder array (4).
3. The hyperspectral polarized imaging apparatus using the reflective retarder array of claim 2, wherein the normal of each retarder is at the same angle with the XY plane.
4. The hyperspectral polarized imaging device adopting the reflective retarder array according to claim 2 or 3, wherein the fast axis of each retarder in the reflective retarder array (4) forms an angle with the YZ plane, and the angle between the ith retarder and the YZ plane is recorded as θiAnd i is 0,1, …, N, wherein the Z-axis is the direction of the target incident light.
5. The hyperspectral polarized imaging device adopting the reflective retarder array according to claim 4, wherein the reflective retarder array (4) comprises 4 phase retarders distributed in a 2 x 2 array.
6. The hyperspectral polarized imaging device adopting the reflective phase retarder array according to claim 5, wherein each phase retarder is made of a birefringent material, one surface of each phase retarder is plated with an antireflection film, and the other surface of each phase retarder is plated with a high-reflection film.
7. The hyperspectral polarized imaging device using the reflective retarder array of claim 6, wherein the shearing interference component (5) comprises a polarizer (5.1), a first Savart crystal (5.2), a second Savart crystal (5.3) and an analyzer (5.4) which are sequentially arranged along the optical path.
8. The hyperspectral polarized imaging device adopting the reflective phase retarder array according to claim 7 is characterized in that the transmission axis direction of the polarizer (5.1) is perpendicular to the Z axis and forms an angle of 45 degrees with the positive direction of the X axis; the optical axis direction of the first Savart crystal (5.2) is vertical to the Y axis and forms an included angle of 45 degrees with the positive direction of the X axis; the optical axis direction of the second Savart crystal (5.3) is perpendicular to both the Y axis and the optical axis direction of the first Savart crystal (5.2); the transmission axis direction of the analyzer (5.4) is parallel to the transmission axis direction of the polarizer (5.1).
9. The imaging method of the hyperspectral polarized imaging device adopting the reflective phase retarder array according to any one of claims 1 to 8, characterized by comprising the following steps:
step 1, incident light from a target is imaged on a diaphragm (2) through an imaging objective lens (1), then forms collimated light beams through a collimating objective lens (3) and is incident to a reflective phase retarder array (4);
step 2, the reflective phase delay sheet array (4) changes the phase delay amount of the collimated light beam and reflects the light with different phase delay amounts to different directions;
step 3, after all the reflected light in the step 2 sequentially passes through the shearing interference component (5) and the post-imaging objective lens (6), interference occurs on the area array detector (7), a plurality of spatially separated spectral interference images in different polarization states are formed, an interference image sequence is formed, and zero-order interference fringes of all the interference images are aligned;
step 4, extracting interference information of each point of the interference image sequence detection target and performing spectrum restoration to obtain the spectrum information of each target point; and (4) carrying out polarization restoration on the spectral interference images in all polarization states at the same moment, so as to obtain the full-polarization information of the target.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20080212091A1 (en) * | 2007-01-25 | 2008-09-04 | Sumitomo Electric Industries, Ltd. | Light source unit and spectrum analyzer |
| CN104748854A (en) * | 2013-12-25 | 2015-07-01 | 南京理工大学 | Full-Stokes interference imaging spectral device and method based on time-sharing polarization modulation |
| CN107367329A (en) * | 2017-06-22 | 2017-11-21 | 西安交通大学 | A kind of image, spectrum, polarization state integration acquisition device and detection method |
| CN108593105A (en) * | 2017-12-14 | 2018-09-28 | 南京理工大学 | The Hyperspectral imaging devices and its imaging method of birefringent polarizing interference-type |
| CN110595621A (en) * | 2019-08-23 | 2019-12-20 | 南京理工大学 | Full-polarization video imaging device adopting reflective phase retarder array |
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- 2020-01-10 CN CN202010024370.4A patent/CN111272278A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080212091A1 (en) * | 2007-01-25 | 2008-09-04 | Sumitomo Electric Industries, Ltd. | Light source unit and spectrum analyzer |
| CN104748854A (en) * | 2013-12-25 | 2015-07-01 | 南京理工大学 | Full-Stokes interference imaging spectral device and method based on time-sharing polarization modulation |
| CN107367329A (en) * | 2017-06-22 | 2017-11-21 | 西安交通大学 | A kind of image, spectrum, polarization state integration acquisition device and detection method |
| CN108593105A (en) * | 2017-12-14 | 2018-09-28 | 南京理工大学 | The Hyperspectral imaging devices and its imaging method of birefringent polarizing interference-type |
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Application publication date: 20200612 |