CN110849484A - Extinction ratio testing device and method for infrared polarization camera with split-focus plane - Google Patents
Extinction ratio testing device and method for infrared polarization camera with split-focus plane Download PDFInfo
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- 230000010287 polarization Effects 0.000 title claims abstract description 71
- 238000012360 testing method Methods 0.000 title claims abstract description 35
- 230000008033 biological extinction Effects 0.000 title claims abstract description 32
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- 238000000691 measurement method Methods 0.000 claims description 3
- 238000010998 test method Methods 0.000 abstract 1
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- 230000010354 integration Effects 0.000 description 2
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- 230000006641 stabilisation Effects 0.000 description 2
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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
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/58—Radiation pyrometry, e.g. infrared or optical thermometry using absorption; using extinction effect
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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
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
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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
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/59—Radiation pyrometry, e.g. infrared or optical thermometry using polarisation; Details thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
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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
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
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Abstract
The invention discloses a device and a method for testing an extinction ratio of a bifocal planar infrared polarization camera. The device comprises an infrared laser, a power stabilizing system, an infrared attenuation sheet, a beam expander, a non-rotating infrared polaroid, a rotatable infrared polaroid and an electric control rotary table. The output laser power of the testing device is adjusted by switching the infrared attenuation sheet; the electric control turntable drives the rotatable infrared polaroid to rotate, and the included angle of the transmission vibration direction of the rotatable infrared polaroid and the non-rotatable infrared polaroid is adjusted. The test method comprises the following steps: (1) switching to a high-transmittance infrared attenuation sheet, and recording response values of the infrared polarization camera under different rotation angles of the rotatable infrared polarization sheet; (2) switching to a low-transmittance infrared attenuation sheet, and recording the response value of the infrared polarization camera under the condition that the rotatable infrared polarization sheet is at the same rotation angle as that in the step 1; (3) and calculating the extinction ratio of each polarization pixel of the infrared polarization camera by using the two groups of response values. The invention has the advantage of high precision of test results.
Description
Technical Field
The invention belongs to the technical field of polarization imaging, and particularly relates to an extinction ratio testing device and method for a bifocal planar infrared polarization imaging camera.
Background
Infrared polarization imaging techniques can obtain intensity and polarization information of the scene radiation. Currently, infrared polarization cameras are mainly classified into a time-sharing type, an amplitude-dividing type, an aperture-dividing type and a focus-dividing type. Compared with the first three types, the infrared polarization camera with the split-focus plane has the advantages of compact structure, high integration level, snapshot imaging and the like. The infrared polarization camera with the split focal plane is realized by integrally packaging the micro-nano grating array on the focal plane of the infrared detector, so that the performance of the infrared polarization camera with the split focal plane is influenced by various factors. The performance of the infrared polarization camera with the focal plane can be reduced due to processing errors of the micro-nano grating array, integration and packaging errors of the micro-nano grating array and the infrared focal plane, and non-uniformity of the infrared detector. The extinction ratio is an important index for representing the performance of the infrared polarization camera with a focusing plane. In order to realize high-precision testing of the focal plane infrared polarization camera, the testing device is required to be capable of providing collimated linear polarization light with high power and infrared bands with different polarization directions. For the extinction ratio test of the infrared polarization camera with a split focal plane, no standard effective test device and method exist.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a device and a method for testing an extinction ratio of a focal plane infrared polarization camera, aiming at the defects in the prior art, and solving the problem that the prior art is difficult to perform high-precision testing on the extinction ratio of the focal plane infrared polarization camera.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the extinction ratio testing device of the infrared polarization camera with the sub-focal plane is characterized in that: the system comprises an infrared laser, a laser stabilizing system, a switchable infrared attenuation sheet, a beam expander, a non-rotating infrared polaroid, a rotatable infrared polaroid and an electric control turntable; the position relation of each device along the light path is as follows: the infrared laser emits laser, and the laser passes through the laser stabilizing system, the switchable infrared attenuation sheet, the beam expander, the non-rotating infrared polaroid and the rotatable infrared polaroid in sequence, so that the infrared polarization camera with the measured sub-focal plane is finally achieved.
The invention discloses an extinction ratio testing device of an infrared polarization camera with a split focal plane, which comprises the following steps: and the laser power entering the infrared polarization camera of the sub-focal plane is adjusted by switching the switchable infrared attenuation sheet.
The invention discloses an extinction ratio testing device of an infrared polarization camera with a split focal plane, which comprises the following steps: the electric control turntable adjusts the included angle of the transmission vibration direction of the rotatable infrared polaroid and the non-rotatable infrared polaroid by driving the rotatable infrared polaroid to rotate.
The invention discloses an extinction ratio testing device of an infrared polarization camera with a split focal plane, which comprises the following steps: the infrared laser adopts 3.39 μm infrared laser as laser source or adopts 10.6 μm infrared laser as laser source.
The invention also discloses an extinction ratio testing method, which adopts any one of the testing devices to execute the following steps:
(1) switching to high-transmittance infrared attenuation sheet, driving the rotatable infrared polarizing sheet to rotate relatively to the non-rotatable infrared polarizing sheet by the electric control turntable at relative rotation angle of α1,α2,…,αNUnder the condition, acquiring N groups of data by using a focal plane infrared polarization camera; wherein each group of data comprises M frames of images, and the average image of each group is marked as x(1),x(2),…,x(N)Wherein a group of response values corresponding to the k-th polarization pixel element are respectively recorded as
(2) The infrared attenuation sheet is switched to the low transmittance infrared attenuation sheet, the electric control turntable drives the rotatable infrared polaroid to rotate relative to the non-rotatable infrared polaroid, and the relative rotation angle is α1,α2,…,αNUnder the condition, acquiring N groups of data by using a focal plane infrared polarization camera; wherein each group of data comprises M frames of images, and the average image of each group is marked as y(1),y(2),…,y(N)Wherein the other group of response values corresponding to the kth polarization pixel are respectively recorded as
(3) Calculating the extinction ratio formula of the kth polarization pixel element according to the two groups of response values obtained in the step (1) and the step (2) as
Wherein the intermediate variable q0，q1And q is2Is calculated by the formula
Wherein the symbols
Representing a pseudo-inverse operation.
As a preferred embodiment of the measurement method disclosed by the present invention: n in the step (1) and the step (2) is an integer not less than 3, and M is an integer not less than 100.
The invention has the beneficial effects that:
the invention discloses a device and a method for testing the extinction ratio of an infrared polarization camera with a split-focal plane. The infrared attenuation sheet is used for adjusting and controlling the laser power, and collimated parallel light is generated after passing through the beam expanding lens. The parallel light vertically irradiates the non-rotating infrared polaroid to form collimated infrared band linear polarized light with adjustable polarization direction. Solves the problem that the prior art is difficult to carry out high-precision test on the extinction ratio of the split focal plane infrared polarization camera
Specifically, the output laser power of the testing device is adjusted by switching the infrared attenuation sheet; the electric control turntable drives the rotatable infrared polaroid to rotate, and the included angle of the transmission vibration direction of the rotatable infrared polaroid and the non-rotatable infrared polaroid is adjusted. The extinction ratio testing method based on the testing device comprises the following steps: (1) switching to a high-transmittance infrared attenuation sheet, and recording response values of the infrared polarization camera under different rotation angles of the rotatable infrared polarization sheet; (2) switching to a low-transmittance infrared attenuation sheet, and recording the response value of the infrared polarization camera under the condition that the rotatable infrared polarization sheet is at the same rotation angle as that in the step 1; (3) and calculating the extinction ratio of each polarization pixel of the infrared polarization camera by using the two groups of response values. The invention has the advantage of high precision of test results.
Drawings
FIG. 1 is a schematic diagram of an extinction ratio testing apparatus of a sub-focal plane infrared polarization camera according to the present invention;
FIG. 2 is a flow chart of the method for testing the extinction ratio of the infrared polarization camera with a split-focal plane according to the present invention.
Detailed Description
The following description of the embodiments of the present invention refers to the accompanying drawings and examples:
example 1:
the extinction ratio measuring device and the extinction ratio measuring method for the split-focus plane infrared polarization camera disclosed by the invention are used for testing the split-focus plane medium wave infrared polarization camera, and the following technical scheme is specifically adopted:
in this example, an infrared laser of 3.39 μm was selected as the laser light source. As shown in fig. 1, an infrared laser, a laser stabilization system, a switchable infrared attenuation sheet, a beam expander, a non-rotating infrared polarizer, a rotatable infrared polarizer are arranged along an optical axis.
The infrared laser emits infrared laser, and the infrared laser with stable power is output after passing through the laser stabilizing system. The infrared attenuation sheet is used for adjusting and controlling the laser power, and collimated parallel light is generated after passing through the beam expanding lens. The parallel light perpendicularly irradiates the non-rotating infrared polarizing plate to form collimated linearly polarized light.
The invention discloses a method for measuring the extinction ratio of an infrared polarization camera with a split focal plane, which comprises the following steps:
step 1: an infrared attenuation sheet with the transmittance of 80% is selected in the device, and the rotatable infrared polaroid is driven to rotate by the electric control turntable in increments with the step length of 30 degrees, so that included angles between the transmission direction of the rotatable infrared polaroid and the transmission direction of the non-rotatable infrared polaroid are respectively 30 degrees, 60 degrees, … degrees and 180 degrees. At each cornerAnd (3) respectively acquiring 100 images by using the measured sub-focal plane infrared polarization camera, and solving an average image under each angle. The average image at each angle is recorded as x(1),x(2)，x(12)Wherein a group of response values corresponding to the k-th polarization pixel element are respectively recorded as
Step 2: an infrared attenuation sheet with the transmittance of 30% is selected in the device, and the rotatable infrared polaroid is driven to rotate by the electric control turntable in increments with the step length of 30 degrees, so that included angles between the transmission direction of the rotatable infrared polaroid and the transmission direction of the non-rotatable infrared polaroid are respectively 30 degrees, 60 degrees and … … 180 degrees. At each angle, 100 images are respectively collected by the tested sub-focal plane infrared polarization camera, and an average image at each angle is obtained. The average image at each rotation angle is recorded as y(1),y(2)，y(N)Wherein the other group of response values corresponding to the kth polarization pixel are respectively recorded as
And step 3: calculating the extinction ratio formula of the kth polarization pixel element according to the two groups of response values,
wherein the intermediate variable q0，q1And q is2The calculation formula of (2) is as follows:
wherein the symbols
Representing a pseudo-inverse operation.
Example 2:
the extinction ratio measuring device and the extinction ratio measuring method for the infrared polarization camera with the split focal plane test the mid-wave infrared polarization camera with the split focal plane specifically adopt the following technical scheme:
in this embodiment, the following are selected: an infrared laser of 10.6 μm was used as the laser light source. As shown in fig. 1, an infrared laser, a laser power stabilization system, an infrared attenuation sheet, a beam expander, a non-rotating infrared polarizer, and a rotatable infrared polarizer are arranged along an optical axis. The infrared laser emits infrared laser, and the infrared laser with stable power can be output after passing through the laser stabilizing system. The infrared attenuation sheet is used for adjusting and controlling the laser power, and collimated parallel light is generated after passing through the beam expanding lens. The parallel light perpendicularly irradiates the non-rotating infrared polarizing plate to form collimated linearly polarized light. The test steps of the extinction measurement method adopting the infrared polarization camera with the focal plane are as follows:
step 1: an infrared attenuation sheet with the transmittance of 80% is selected in the device, and the rotatable infrared polaroid is driven to rotate by the electric control turntable in increments with the step length of 30 degrees, so that included angles between the transmission direction of the rotatable infrared polaroid and the transmission direction of the non-rotatable infrared polaroid are respectively 30 degrees, 60 degrees, … degrees and 180 degrees. At each angle, 100 images are respectively collected by the tested sub-focal plane infrared polarization camera, and an average image at each angle is obtained. The average image at each angle is respectively marked as x(1),x(2),…,x(12)Wherein a group of response values corresponding to the k-th polarization pixel element are respectively recorded as
Step 2: an infrared attenuation sheet with the transmittance of 30% is selected in the device, and the rotatable infrared polaroid is driven to rotate by the electric control turntable in increments with the step length of 30 degrees, so that included angles between the transmission direction of the rotatable infrared polaroid and the transmission direction of the non-rotatable infrared polaroid are respectively 30 degrees, 60 degrees, … degrees and 180 degrees. At each angle, 100 images are respectively collected by the tested sub-focal plane infrared polarization camera, and an average image at each angle is obtained. The average image at each rotation angle is respectively recorded as y(1),y(2)，y(N)Wherein, the other group of response values corresponding to the kth polarization pixel are respectively recorded as
And step 3: calculating the extinction ratio formula of the kth polarization pixel element according to the two groups of response values,
wherein the intermediate variable q0，q1And q is2Is calculated by the formula
Wherein the symbols
Representing a pseudo-inverse operation.
While the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the above embodiments, and various changes, which relate to the related art known to those skilled in the art and fall within the scope of the present invention, can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims.
Claims (6)
1. The extinction ratio testing device of the infrared polarization camera with the sub-focal plane is characterized in that: the system comprises an infrared laser, a laser stabilizing system, a switchable infrared attenuation sheet, a beam expander, a non-rotating infrared polaroid, a rotatable infrared polaroid and an electric control turntable; the position relation of each device along the light path is as follows: the infrared laser emits laser, and the laser passes through the laser stabilizing system, the switchable infrared attenuation sheet, the beam expander, the non-rotating infrared polaroid and the rotatable infrared polaroid in sequence, so that the infrared polarization camera with the measured sub-focal plane is finally achieved.
2. The test device of claim 1, wherein: and the laser power entering the infrared polarization camera of the sub-focal plane is adjusted by switching the switchable infrared attenuation sheet.
3. The test device of claim 1, wherein: the electric control turntable adjusts the included angle of the transmission vibration direction of the rotatable infrared polaroid and the non-rotatable infrared polaroid by driving the rotatable infrared polaroid to rotate.
4. The test device of claim 1, wherein: the infrared laser adopts 3.39 μm infrared laser as laser source or adopts 10.6 μm infrared laser as laser source.
5. The extinction ratio testing method is characterized in that the testing device of any one of claims 1 to 4 is adopted to execute the following steps:
(1) switching to high-transmittance infrared attenuation sheet, driving the rotatable infrared polarizing sheet to rotate relatively to the non-rotatable infrared polarizing sheet by the electric control turntable at relative rotation angle of α1,α2,…,αNUnder the condition, acquiring N groups of data by using a focal plane infrared polarization camera; wherein each group of data comprises M frames of images, and the average image of each group is marked as x(1),x(2),…,x(N)Wherein a group of response values corresponding to the k-th polarization pixel element are respectively recorded as
(2) The infrared attenuation sheet is switched to the low transmittance infrared attenuation sheet, the electric control turntable drives the rotatable infrared polaroid to rotate relative to the non-rotatable infrared polaroid, and the relative rotation angle is α1,α2,…,αNUnder the condition, acquiring N groups of data by using a focal plane infrared polarization camera; wherein each group of data comprises M framesImages, the average image of each group is noted as y(1),y(2),…,y(N)Wherein the other group of response values corresponding to the kth polarization pixel are respectively recorded as
(3) Calculating the extinction ratio formula of the kth polarization pixel element according to the two groups of response values obtained in the step (1) and the step (2) as
Wherein the intermediate variable q0，q1And q is2Is calculated by the formula
Wherein the symbolsRepresenting a pseudo-inverse operation.
6. The measurement method according to claim 5, wherein: n in the step (1) and the step (2) is an integer not less than 3, and M is an integer not less than 100.
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