CN111982285A - Double-blackbody infrared polarization focal plane reflected light elimination method - Google Patents
Double-blackbody infrared polarization focal plane reflected light elimination method Download PDFInfo
- Publication number
- CN111982285A CN111982285A CN202010710906.8A CN202010710906A CN111982285A CN 111982285 A CN111982285 A CN 111982285A CN 202010710906 A CN202010710906 A CN 202010710906A CN 111982285 A CN111982285 A CN 111982285A
- Authority
- CN
- China
- Prior art keywords
- camera
- polaroid
- focal plane
- infrared
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000010287 polarization Effects 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000008030 elimination Effects 0.000 title description 6
- 238000003379 elimination reaction Methods 0.000 title description 6
- 238000002474 experimental method Methods 0.000 claims abstract description 23
- 238000005057 refrigeration Methods 0.000 claims abstract description 9
- 238000003384 imaging method Methods 0.000 claims description 9
- 230000003287 optical effect Effects 0.000 claims description 8
- 238000005286 illumination Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 description 11
- 230000004044 response Effects 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 8
- 238000012937 correction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- PFNQVRZLDWYSCW-UHFFFAOYSA-N (fluoren-9-ylideneamino) n-naphthalen-1-ylcarbamate Chemical compound C12=CC=CC=C2C2=CC=CC=C2C1=NOC(=O)NC1=CC=CC2=CC=CC=C12 PFNQVRZLDWYSCW-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- OYLGJCQECKOTOL-UHFFFAOYSA-L barium fluoride Chemical compound [F-].[F-].[Ba+2] OYLGJCQECKOTOL-UHFFFAOYSA-L 0.000 description 1
- 229910001632 barium fluoride Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- CBEQRNSPHCCXSH-UHFFFAOYSA-N iodine monobromide Chemical compound IBr CBEQRNSPHCCXSH-UHFFFAOYSA-N 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052716 thallium Inorganic materials 0.000 description 1
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- G01J4/00—Measuring polarisation of light
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
-
- 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
- G01J4/00—Measuring polarisation of light
- G01J4/04—Polarimeters using electric detection means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The invention discloses a method for eliminating reflected light of an infrared polarization focal plane of a double-blackbody.A camera emits infrared light which is reflected to a second blackbody by a polaroid and is absorbed by the second blackbody; the first black body emits infrared light, the infrared light is modulated into polarized light through the polaroid, and the polarized light enters the camera and is measured by the focal plane of the camera to complete a polarization experiment. The problem of current non-refrigeration formula divide focal plane infrared polarization camera use, the infrared light that the focal plane produced causes the interference to infrared polarization focal plane measurement is solved.
Description
Technical Field
The invention belongs to the technical field of polarized optical imaging, and particularly relates to a method for eliminating reflected light of an infrared polarized focal plane of a double-blackbody.
Background
The principle of the infrared polarization camera is that an array consisting of micro-polarizers in different polarization directions (0 degrees, 45 degrees, 90 degrees and 135 degrees) which are periodically and circularly arranged is covered on a focal plane of the infrared polarization camera, the detection is carried out, the arrangement of the polarization directions is shown as figure 3, a pixel with the polarization direction of 0 degree is taken as an example, the response value of the pixel is the highest to the polarization light of 0 degree, the response value is the lowest to the polarization light of 90 degrees, and the response value is between the two values to the polarization light of 45 degrees and 135 degrees. The 4 grids shown in fig. 3 represent 4 pixels adjacent to each other in the focal plane, and the direction of the lines in the grids, which represents the polarization detection direction of the pixel, has the highest response value of the pixel among the 4 pixels when irradiated with polarized light in the same direction as the polarization detection direction.
In experiments using a polarization camera, such as calibration and non-uniform correction, polarized light is generally generated by placing a polarizer directly in front of the radiation source, and the high extinction (10000: 1 or more) polarizers used are basically reflective polarizers. The working principle of the polaroid is that the extremely dense metal grid bars are arranged to reflect the parts except the polarized light in the selected direction, and only the polarized light in the selected direction is allowed to transmit, so that the purpose of generating the polarized light in the specific direction is achieved.
Reflective polarizers have shown excellent performance in most polarization camera experiments, but this way of generating infrared polarized light in a particular direction has created a new problem in experiments related to uncooled, focal plane-separated infrared cameras. The non-refrigeration type focus-dividing plane infrared polarization camera has the advantages of miniaturization, integration and the like, and a heavy refrigeration device is abandoned for the purpose, so that the camera and the focus plane cannot be refrigerated in a working state; the focal plane of the camera can continuously generate heat during working, heat the focal plane, and finally reach a balance between heating and heat dissipation at a temperature (40-50 ℃) far exceeding the room temperature, so that the temperature of the focal plane fluctuates along with the change of time and working environment in the temperature interval. At this time, the heated focal plane continuously emits infrared light with a certain intensity outwards, the infrared light is emitted from the lens through the optical path and irradiates on the reflective polarizer arranged in the polarization experiment, and due to the operating characteristics of the reflective polarizer, the infrared polarized light in accordance with the polarization detection direction is transmitted, the rest light is reflected, and then the polarized light orthogonal to the selected polarization detection direction enters the infrared polarization camera again through reflection, which causes serious influence on the related polarization experiment, and especially when the temperature of the black body as the infrared light source is lower than the operating temperature of the focal plane, even a detection result opposite to the expected polarization direction can be obtained.
As shown in fig. 4, taking the pixel with the polarization detection direction of 0 ° as an example, when the temperature of the black body is low, the response value of the black body is smaller when the polarization transmission direction of the polarizer is 0 ° than when the polarization transmission direction of the polarizer is 90 °, because the intensity of the 0 ° polarized light generated by the infrared light emitted by the black body transmitting through the polarizer is smaller than the 90 ° polarized light reflected by the polarizer; as the black body temperature increases, the former will eventually increase more than the latter, showing normal polarization characteristics. And because the working temperature of the non-refrigeration type infrared camera is unstable and fluctuates along with time and environment in a range, the obtained detection value changes along with time and environment, and the problems bring non-negligible influence on a large number of experiments such as calibration, non-uniform correction and the like of the non-refrigeration type infrared polarization camera. Therefore, a special light path design method is needed to avoid the influence of reflected light generated by irradiating the infrared polarizing plate by the heating focal plane on a series of experiments related to the uncooled infrared polarizing camera.
Disclosure of Invention
The invention aims to provide a double-blackbody infrared polarization focal plane reflected light elimination method to solve the problem that infrared light generated by a focal plane interferes with the measurement of the infrared polarization focal plane in the use process of the existing non-refrigeration type split-focal plane infrared polarization camera.
The invention adopts the following technical scheme: an imaging system for dual blackbody cancellation of infrared polarized focal plane reflected light, comprising:
the camera is a non-refrigeration type focus-splitting plane infrared polarization camera;
the polaroid is a reflective infrared polaroid, is arranged in front of the camera lens and is not vertical to the light rays emitted by the camera;
the first black body is arranged on one side of the polaroid far away from the camera at intervals and used for generating infrared light;
the second black body is arranged on one side, close to the camera, of the polaroid at intervals, is positioned on a normal extension line of the polaroid, is perpendicular to the normal direction of the polaroid, and is used for absorbing the received infrared light;
the polaroid is used for modulating the infrared light transmitted by the first black body into polarized light, and then the polarized light enters a camera and is measured by a focal plane of the camera; and the infrared light emitted by the camera focal plane is reflected to the second black body.
A double-blackbody infrared polarization focal plane reflected light elimination method is based on an imaging system and comprises the following contents:
infrared light emitted by a focal plane of the camera is reflected to the second black body through the polaroid and is absorbed by the second black body;
the first black body emits infrared light, the infrared light is modulated into polarized light through the polaroid, and the polarized light enters the camera and is measured by the focal plane of the camera to complete a polarization experiment.
Further, the angle setting method of the polaroid comprises the following steps:
measuring the length H and the width W of a focal plane of a camera 1, the diameter D of a lens and the side length l of a polaroid 2;
step (2), combining the focal length f of the lens of the camera 1, and calculating the field angle of the camera by the formula (1)
And (3) setting L as the distance between the polaroid and the front end of the camera lens, and combining the angle of field obtained in the step (2)
The field of view FOV of the camera is calculated from equation (2):
due to the reversibility of the optical path, the field of view FOV can be equivalent to the illumination range of the hot focal plane.
And (4) setting theta as a deflection angle of the polaroid, and calculating by using a formula (3) to obtain the diameter d of the maximum inner circle of the deflected polaroid in the projection of the polaroid in the direction of the connecting line of the polaroid and the camera:
d＝lcosθ (3)，
according to deviationThe size of the vibrating plate and the camera is satisfied
Under the constraint condition, under the condition that the reflected light of the infrared light emitted by the focal plane does not enter the lens any more, a proper combination of the deflection angle theta of the polaroid and the distance L from the front end of the camera lens is selected.
The invention has the beneficial effects that: the reflection type polaroid which is a certain distance away from the uncooled infrared polarization camera is deflected by an angle constrained by conditions, so that infrared light emitted from a black body can normally penetrate through the polaroid to generate polarized light in a specific direction to irradiate the focal plane, infrared light emitted by a heating focal plane is reflected to another black body close to the room temperature through the polaroid, the infrared light is absorbed by the black body by utilizing the energy absorption characteristic of the black body, and the infrared polarized light which is generated after the infrared light emitted by the heating focal plane irradiates on the polaroid and is orthogonal to the polarization detection direction is prevented from being reflected to the focal plane, and the measurement of the polarized light emitted by the black body and modulated by the polaroid by a detector on the focal plane is influenced.
Drawings
FIG. 1 is a flow chart of a method for dual blackbody infrared polarized focal plane reflected light cancellation according to the present invention;
FIG. 2 is a block diagram and an optical path diagram of an imaging system for eliminating infrared polarized focal plane reflected light by a double black body according to the present invention;
in fig. 2, 1, camera, 2, polarizer, 3, first black body, 4, second black body, 5, infrared light, 6, polarized light;
FIG. 3 is a schematic diagram of four pixel polarization directions in a super pixel of a non-refrigerated split-focus plane infrared polarization camera in the background art;
in fig. 3, 11 pixels with an analyzing direction of 0 °, 12 pixels with an analyzing direction of 45 °, 13 pixels with an analyzing direction of 90 °, and 14 pixels with an analyzing direction of 135 °;
FIG. 4 is a corresponding curve of polarization light of 0 °, 45 °, 90 °, and 135 ° faced by four pixels in a super-pixel under low, medium, and high temperatures in a polarization experiment in the prior art;
fig. 5 is a corresponding curve when four pixels in the super-pixel face polarized light in the directions of 0 °, 45 °, 90 °, 135 ° at low, medium, and high temperatures in a polarization experiment performed by using the double-black-body infrared polarization focal plane reflected light elimination method of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 2, the present invention provides an imaging system for eliminating infrared polarized focal plane reflected light by a double black body, which comprises a camera 1, a polarizer 2, a first black body 3, a second black body 4, infrared light 5 and polarized light 6. In some embodiments, camera 1 is a non-refrigerated split-focus plane infrared polarization camera; the polarizer 2 must be a reflective metal wire grid polarizer, but may be a different substrate such as barium fluoride, calcium fluoride, thallium bromoiodide, or zinc selenide, etc., such as a silicon substrate metal wire grid polarizer. The polarizer 2 is placed right in front of the lens of the camera 1, but the polarizer 2 is not disposed perpendicular to the light emitted from the camera 1, and the polarizer 2 is disposed to be rotated by a certain deflection angle. The angular range of the polarizer 2 depends on the size of the camera lens, the size of the polarizer, and the angle of view of the camera.
The two sides of the polaroid 2 are respectively provided with a first black body 3 and a second black body 4, wherein the first black body 3 is arranged on one side of the polaroid 2, which is far away from the camera 1, and is arranged at an interval with the polaroid 2, and the first black body 3 is used for generating infrared light 5 to carry out subsequent polarization experiments. The second black body 4 is arranged on one side of the polaroid 2 close to the camera 1, the polaroid 2 is positioned on the extension line of the normal of the polaroid 2, the second black body 4 is vertical to the normal direction of the polaroid 2, and the second black body 4 is used for absorbing the received infrared light 5.
In the imaging system of the present invention, the polarizer 2 is not normally vertically disposed, and after being disposed at an angle, it can perform two functions: firstly, infrared light 5 transmitted by a first black body 3 is modulated into polarized light 6, and the polarized light 6 can be measured by a focal plane of a camera 1 after entering the camera, so that a polarization experiment is completed; secondly, infrared light 5 emitted by the focal plane of the camera 1 is reflected to the second black body 4 to be absorbed, and the influence of the infrared light 5 emitted by the focal plane on a polarization experiment is eliminated.
As shown in fig. 1, the present invention also provides a method for eliminating reflected light from an infrared polarized focal plane of a double black body, which is based on an imaging system including a camera 1, a polarizer 2, a first black body 3, a second black body 4, infrared light 5 and polarized light 6. In some embodiments, camera 1 is a non-refrigerated split-focus plane infrared polarization camera; the polaroid 2 is a reflective infrared polaroid, the polaroid 2 is arranged right in front of the lens of the camera 1, but the polaroid 2 is not arranged perpendicular to the light rays emitted by the camera 1, and the polaroid 2 is arranged to rotate by a certain deflection angle.
The two sides of the polaroid 2 are respectively provided with a first black body 3 and a second black body 4, wherein the first black body 3 is arranged on one side of the polaroid 2, which is far away from the camera 1, and is arranged at an interval with the polaroid 2, and the first black body 3 is used for generating infrared light 5 to carry out subsequent polarization experiments. The second black body 4 is arranged on one side of the polaroid 2 close to the camera 1, the polaroid 2 is positioned on the extension line of the normal of the polaroid 2, the second black body 4 is vertical to the normal direction of the polaroid 2, and the second black body 4 is used for absorbing the received infrared light 5.
In the imaging system of the present invention, the polarizer 2 is not normally vertically disposed, and after being disposed at an angle, it can perform two functions: firstly, infrared light 5 transmitted by a first black body 3 is modulated into polarized light 6, and the polarized light 6 can be measured by a focal plane of a camera 1 after entering the camera, so that a polarization experiment is completed; secondly, infrared light 5 emitted by the focal plane of the camera 1 is reflected to the second black body 4 to be absorbed, and the influence of the infrared light 5 emitted by the focal plane on a polarization experiment is eliminated.
The elimination method specifically comprises the following steps: the infrared light 5 emitted by the focal plane of the camera 1 is emitted to the polarizer 2, reflected by the polarizer 2, enters the second black body 4 and is absorbed by the second black body 4. The infrared light 5 is emitted by the first black body 3, the infrared light 5 is modulated by the polaroid 2 to be polarized light 6, the polarized light 6 enters the camera 1 and is measured by a focal plane of the camera 1, and a polarization experiment can be completed under the condition that the influence of reflected light is eliminated.
In this erasing method, the angle setting method of the polarizing plate 2 is:
measuring the length H and the width W of a focal plane of a camera 1, the diameter D of a lens and the side length l of a polaroid 2;
step (2), combining the focal length f of the lens of the camera 1, and calculating the field angle of the camera by the formula (1)
And (3) setting L as the distance between the polaroid 2 and the front end of the lens of the camera 1, and combining the angle of field obtained in the step (2)
The field of view FOV of the camera is calculated from equation (2):
due to the reversibility of the optical path, the field of view FOV can be equivalent to the illumination range of the hot focal plane.
And (4) setting theta as a deflection angle of the polaroid 2, and calculating by using a formula (3) to obtain the diameter d of the maximum inner circle of the deflected polaroid in the projection of the polaroid in the direction of the connecting line of the polaroid and the camera:
d＝lcosθ (3)，
according to the sizes of the polaroid 2 and the camera 1, the requirements are satisfied
Under the constraint condition, under the condition that the reflected light of the infrared light 5 emitted by the focal plane does not enter the lens any more, a proper combination of the deflection angle theta of the polaroid and the distance L from the front end of the camera lens is selected.
The polarizer 2 is set at an angle that firstly makes the field of view of the camera totally in the polarizer so that the whole focal plane can be irradiated by the modulated polarized light, and simultaneously makes the irradiation range of the infrared light emitted by the focal plane in the polarizer so that the reflected light is totally reflected, wherein the two conditions require that the set angle is less than a certain angle; secondly, to prevent reflected light from entering the lens requires setting an angle larger than a certain angle. The calculation method provided by the invention can obtain an angle range of the polaroid at a certain position, and the angle in the range can enable the condition to be satisfied.
Example (b):
as a result of measurement, the focal plane length H and width W of the infrared polarization camera used are 11mm and 8.7mm, the lens diameter D is 32mm, the side length l of the polarizer used is 100mm, the focal length f of the camera lens is 25mm, and the field angle can be obtained from the formula shown in step (2)
At this time, the field of view equivalent to the irradiation range
As a function of polarizer-camera distance L; the maximum inner circle diameter d of the projection of the deflected polarizer, lcos θ, is a function related to the deflection angle θ; specific constraints are obtained in conclusion:
a polarizer deflection angle and a distance from the front end of the camera lens satisfying the constraint are set, where θ is 45 ° and L is 27 mm.
Finally, a black body 1 for absorbing infrared light emitted from the heating focal plane and reflected by the polarizing plate is placed on the normal line of the polarizing plate plane on the side close to the camera; the implementation of the method proposed by the present invention can be accomplished by placing a black body 2 for generating the infrared light to be modulated on the line connecting the polarizer and the camera behind the polarizer.
The structure diagram and the optical path after completion are shown in fig. 2, and the pixel response returns to normal as shown in fig. 5, and normal polarization analysis characteristics are shown at low, medium and high temperatures. In fig. 5, the ordinate is the response value of the camera, the abscissa is the polarization direction of the polarized light generated by transmitting the polarizer, the left, middle and right 3 sets of curves represent the pixel response under the irradiation of the low, middle and high temperature black body respectively, and the 4 curves in each set of curves represent the response value changes of the pixels with 4 analyzing directions under the irradiation of the polarized light with 4 directions; after the invention is adopted, the pixels in four polarization detection directions of 0 degree, 45 degrees, 90 degrees and 135 degrees show normal polarization detection characteristics under the irradiation of low, medium and high temperature blackbodies. The method is simple, the influence of the reflected light generated by the infrared polaroid irradiated by the heating focal plane on experiments related to the infrared polarization camera, such as calibration, non-uniform correction and the like, is eliminated, and the measurement accuracy is improved.
From the reversibility of the optical path, it can be seen that for the optical path, if light goes from a to B, the light can go back from B to a in a constant path, which is an experimental theorem of light. A beam of light enters the light path of the lens to irradiate the focal plane, and the light path of the heating focal plane through the lens image to emit infrared light is formed after the light beam is reversed. The field of view of the camera, which is calculated from the diagonal length of the focal plane and the focal length of the lens, can be considered as the irradiation range of the infrared light emitted from the focal plane. Therefore, the polarizing film positioned in front of the lens by a certain distance is deflected by a certain angle, infrared light is completely deflected while the irradiation range is still in the polarizing film, and the deflected infrared light is completely absorbed by the black body and is not reflected back to the focal plane by the reflective polarizing film, so that the interference light orthogonal to the selected polarization direction can be eliminated, and undoped polarized light is provided for the calibration, non-uniform correction and other experiments of the non-refrigeration infrared polarization camera. There are currently no other solutions specifically directed to this problem.
The invention provides a method for eliminating reflected light of an infrared polarization focal plane of a double blackbody, the constraint provided by the invention is obtained through certain calculation, the constraint is applied to the deflection of a reflective polaroid 2, and all infrared light 5 emitted by a heating focal plane is deflected; two black bodies are used, the second black body 4 is placed in the normal direction of the polaroid 2 at the same side of the camera, and the infrared light 5 reflected by the deflected reflective infrared polaroid 2 is absorbed by utilizing the characteristic that the second black body 4 can completely absorb the energy radiated on the surface of the second black body, so that the infrared light does not return to the camera 1 through any way; the first black body 3 is arranged behind the polaroid 2 and is responsible for generating infrared light 5 required by the experiment, and the infrared light 5 is modulated by the polaroid 2 and then becomes polarized light 6 in a specific direction, and enters the camera to be measured by a focal plane so as to finish the target experiment. In this way, the infrared light 5 entering the camera can be maximally ensured to be polarized light 6 in a desired specific direction, and the polarized light 6 which is reflected by the heat-emitting focal plane irradiation polarizing plate 2 and is orthogonal to the desired direction is not doped.
The above is a preferred embodiment of the present invention, and those skilled in the art to which the present invention pertains can make variations and modifications to the above embodiment. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, substitutions and variations based on the present invention by those skilled in the art are included in the scope of the present invention.
Claims (3)
1. An imaging system for eliminating infrared polarized focal plane reflected light by a double black body, comprising:
the camera (1) is a non-refrigeration type focus-splitting plane infrared polarization camera;
the polaroid (2) is a reflective infrared polaroid, is arranged in front of the lens of the camera (1), and is not vertical to the light emitted by the camera (1);
the first black body (3) is arranged on one side, away from the camera (1), of the polaroid (2) at intervals and used for generating infrared light (5);
the second black body (4) is arranged on one side, close to the camera (1), of the polaroid (2) at intervals, is positioned on a normal extension line of the polaroid (2), is perpendicular to the normal direction of the polaroid (2), and is used for absorbing received infrared light (5);
the polaroid (2) is used for modulating infrared light (5) transmitted by the first black body (3) into polarized light (6), entering the camera (1) and being measured by a focal plane of the camera; and is also used for reflecting the infrared light (5) emitted by the focal plane of the camera (1) to the second black body (4).
2. The method for eliminating the reflected light of the infrared polarization focal plane of the double black body is characterized in that the imaging system based on the claim 1 comprises the following contents:
infrared light (5) emitted by the focal plane of the camera (1) is reflected to the second black body (4) by the polarizer (2) and is absorbed by the second black body (4);
the first black body (3) emits infrared light (5), the infrared light is modulated into polarized light (6) through the polaroid (2), and the polarized light enters the camera (1) and is measured by a focal plane of the camera to complete a polarization experiment.
3. The method for eliminating the reflected light of the infrared polarized focal plane of the double black body as set forth in claim 2, wherein the angle setting method of the polarizing plate (2) is:
measuring the length H and the width W of a focal plane of the camera (1), the diameter D of a lens and the side length l of the polaroid (2);
step (2), combining the focal length f of the lens of the camera (1), and calculating the field angle of the camera by the formula (1)
And (3) setting L as the distance between the polaroid (2) and the front end of the lens of the camera (1), and combining the angle of view obtained in the step (2)
The field of view FOV of the camera is calculated from equation (2):
due to the reversibility of the optical path, the field of view FOV can be equivalent to the illumination range of the hot focal plane.
And (4) setting theta as a deflection angle of the polaroid (2), and calculating by using a formula (3) to obtain the diameter d of the maximum inner circle of the deflected polaroid in the projection of the polaroid in the direction of the connecting line of the polaroid and the camera:
d＝lcosθ (3)，
d is satisfied according to the sizes of the polaroid (2) and the camera (1)>FOV,L>0,
Under the constraint condition, under the condition that the reflected light of the infrared light (5) emitted by the focal plane does not enter the lens any more, a proper combination of the deflection angle theta of the polaroid and the distance L from the front end of the camera lens is selected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010710906.8A CN111982285B (en) | 2020-07-22 | 2020-07-22 | Method for eliminating infrared light emitted by infrared polarization focal plane of double blackbodies |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010710906.8A CN111982285B (en) | 2020-07-22 | 2020-07-22 | Method for eliminating infrared light emitted by infrared polarization focal plane of double blackbodies |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111982285A true CN111982285A (en) | 2020-11-24 |
| CN111982285B CN111982285B (en) | 2021-06-11 |
Family
ID=73438081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010710906.8A Active CN111982285B (en) | 2020-07-22 | 2020-07-22 | Method for eliminating infrared light emitted by infrared polarization focal plane of double blackbodies |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111982285B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507006A (en) * | 2011-12-20 | 2012-06-20 | 中国兵器工业第二○五研究所 | Acousto-optic tunable filter-based infrared differential hyperspectral imaging device |
| CN104297935A (en) * | 2013-11-27 | 2015-01-21 | 中国航空工业集团公司洛阳电光设备研究所 | Refrigeration-type infrared imaging system and cold reflection elimination device and method thereof |
| US20200036914A1 (en) * | 2018-07-30 | 2020-01-30 | Lumileds Llc | Use of ir pre-flash for rgb camera's automatic algorithms |
| CN110781869A (en) * | 2019-11-22 | 2020-02-11 | 上海掌腾信息科技有限公司 | Reflection eliminating device for palm vein recognition system |
| CN111351572A (en) * | 2019-11-21 | 2020-06-30 | 四川极智朗润科技有限公司 | Distributed reflection elimination device and method based on polarization characteristics |
-
2020
- 2020-07-22 CN CN202010710906.8A patent/CN111982285B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507006A (en) * | 2011-12-20 | 2012-06-20 | 中国兵器工业第二○五研究所 | Acousto-optic tunable filter-based infrared differential hyperspectral imaging device |
| CN104297935A (en) * | 2013-11-27 | 2015-01-21 | 中国航空工业集团公司洛阳电光设备研究所 | Refrigeration-type infrared imaging system and cold reflection elimination device and method thereof |
| US20200036914A1 (en) * | 2018-07-30 | 2020-01-30 | Lumileds Llc | Use of ir pre-flash for rgb camera's automatic algorithms |
| CN111351572A (en) * | 2019-11-21 | 2020-06-30 | 四川极智朗润科技有限公司 | Distributed reflection elimination device and method based on polarization characteristics |
| CN110781869A (en) * | 2019-11-22 | 2020-02-11 | 上海掌腾信息科技有限公司 | Reflection eliminating device for palm vein recognition system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111982285B (en) | 2021-06-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4925295A (en) | Projection display apparatus | |
| US4787737A (en) | Projection display apparatus | |
| US5804827A (en) | Infrared ray detection device and solid-state imaging apparatus | |
| US9641825B2 (en) | Gated 3D camera | |
| WO2022048311A1 (en) | Distance measuring apparatus, distance measuring method, camera and electronic device | |
| CN109932061A (en) | A kind of face battle array thermal infrared imager real-time correction method based on cold emission | |
| CN104297935A (en) | Refrigeration-type infrared imaging system and cold reflection elimination device and method thereof | |
| US11520173B2 (en) | Transmission type adaptive optical system | |
| CN111982285B (en) | Method for eliminating infrared light emitted by infrared polarization focal plane of double blackbodies | |
| CN216434623U (en) | Optical lens equipment and adjustable uniform light source system | |
| JP4216730B2 (en) | Improvements in or relating to infrared camera calibration | |
| KR102277509B1 (en) | Thermal imaging apparatus | |
| CN105865268B (en) | A kind of infrared optical system and its method for resisting laser blinding | |
| JPH06167705A (en) | Single plate liquid crystal projector | |
| CN211086800U (en) | Infrared optical industrial endoscope system and equipment | |
| Krueger et al. | Operational performance of the university of Minnesota 45kWe high-flux solar simulator | |
| CN105527024B (en) | Temperature measuring equipment, system and method based on light radiation | |
| MacQuigg et al. | Beam diagnostics on ARGUS | |
| CN111443101A (en) | Direct comparison system for different crystal X-ray diffraction efficiencies | |
| CN110207823A (en) | Four polarization state of medium-wave infrared while imaging optical system | |
| CN219225293U (en) | High-power illumination optical system | |
| JP3011211B1 (en) | Infrared imaging method and infrared imaging device | |
| CN104198038B (en) | The brightness detection method of built-in light source | |
| KR101257749B1 (en) | Infrared radiation thermometer observation system | |
| Holldack et al. | A Bragg-Fresnel multilayer electron beam monitor for third generation storage rings |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20231101 Address after: Room 049, F2005, 20th Floor, Building 4-A, Xixian Financial Port, Fengdong New City Energy Jinmao District, Xixian New District, Xi'an City, Shaanxi Province, 710086 Patentee after: Shaanxi Strong Polarization Visual Technology Co.,Ltd. Address before: 710072 No. 127 Youyi West Road, Shaanxi, Xi'an Patentee before: Northwestern Polytechnical University |