CN114166357A - Infrared detector roll angle measuring method - Google Patents
Infrared detector roll angle measuring method Download PDFInfo
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- CN114166357A CN114166357A CN202111288162.6A CN202111288162A CN114166357A CN 114166357 A CN114166357 A CN 114166357A CN 202111288162 A CN202111288162 A CN 202111288162A CN 114166357 A CN114166357 A CN 114166357A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 14
- 238000003331 infrared imaging Methods 0.000 claims abstract description 13
- 238000003384 imaging method Methods 0.000 claims abstract description 9
- 238000000691 measurement method Methods 0.000 claims 3
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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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
- G01J2005/0077—Imaging
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- Spectroscopy & Molecular Physics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention belongs to the field of photoelectric detection, and relates to a method for measuring a roll angle of an infrared detector. Due to the influence of processing errors of infrared detector parts and the level of an assembly process, a certain included angle (roll angle) exists between an imaging horizontal plane of the infrared detector and a detector installation reference plane. Aiming at the problem that the roll angle of an infrared detector cannot be directly measured, the roll angle measuring method of the infrared detector is provided, the horizontal calibration is carried out on a turntable, the infrared detector is matched with an infrared imaging circuit and a testing lens to image a point light source target of a collimator, the center of the point light source target in an image is moved from the leftmost center to the rightmost side by rotating the azimuth, and the roll angle of the infrared detector is obtained by measuring the number of pixels of the point light source target from the rightmost center position and combining a corresponding formula. The measuring process is simple to realize, the calculated amount is small, and the method can be well applied to engineering time.
Description
Technical Field
The invention belongs to the technical field of photoelectric detection, and particularly relates to a roll angle measuring method of an infrared detector.
Background
The infrared imaging system has the advantages of high sensitivity and good imaging performance, and is widely applied to civil markets and military purposes. In the civil field, the system can be used for urban security, offshore oil monitoring, forest fire prevention and the like. In military affairs, the device is mainly used for photoelectric detection, infrared reconnaissance, infrared guidance, single-soldier handheld equipment and the like;
under the influence of the processing error of the infrared detector parts and the assembly process level, a certain included angle exists between the imaging horizontal plane of the infrared detector and the installation reference plane of the detector, and the included angle is also called as the roll angle of the infrared detector. Due to the existence of the roll angle of the infrared detector, a certain deviation exists between the horizontal direction of the infrared imaging system and an actual scene, and the observation effect of the infrared imaging system is influenced. Due to the structural limitation of the detector, the roll angle of the infrared detector cannot be directly measured, and in order to solve the problem that the roll angle of the infrared detector is difficult to measure, a method for measuring the roll angle of the infrared detector is provided. The roll angle of the infrared detector is measured by performing horizontal test calibration on the rotary table, imaging the point light source by using the test lens, rotating the rotary table to enable the point light source to move from the leftmost side to the rightmost side of the image, and calculating a roll angle according to a formula by measuring the number of pixels moved in the vertical direction of the point light source.
Disclosure of Invention
The technical problem solved by the invention is as follows: the invention provides a roll angle measuring method of an infrared detector, which aims to solve the problem that the roll angle of the infrared detector is difficult to measure and realize the accurate measurement of the roll angle of the infrared detector.
The technical scheme of the invention is as follows: a roll angle measuring method of an infrared detector comprises the following steps:
step 1: and (3) carrying out horizontal test calibration on the rotary table:
step 2: placing an infrared detector with an infrared imaging circuit and a test lens on a turntable, and aligning a parallel light tube point light source to clearly image a target;
and step 3: sending a command to the infrared imaging circuit to enable the image to be full-screen crossed, and rotating the azimuth state of the turntable to enable the center of a point light source target in the image to be at the leftmost side of the image and to fall on a cross line;
and 4, step 4: the position of the cross line is moved up and down to enable the center of the point-like light source target to fall on the cross line, and the number delta of pixels moved up and down of the cross line is recorded;
and 5: by the formula
And calculating to obtain the roll angle theta of the infrared detector.
The further technical scheme of the invention is as follows: in the step 1, the leveling test and calibration is to place the level gauge on the rotary table, adjust the azimuth and the pitching position of the rotary table and ensure that the rotary table surface is always in a horizontal state when the rotary table rotates in the azimuth.
The further technical scheme of the invention is as follows: in the step 2, the diameter of the point light source target is not more than 3 pixels.
The further technical scheme of the invention is as follows: the cross center of the full-screen cross of the image is superposed with the image center.
Effects of the invention
The invention has the technical effects that: according to the invention, the turntable is horizontally calibrated, so that the mounting surface of the turntable is in a horizontal state, the infrared detector is matched with the infrared imaging circuit and the test lens to image a point light source target of the collimator, the center of the point light source target in the image is moved from the leftmost center to the rightmost center in a rotating state, the roll angle of the infrared detector is obtained by measuring the number of pixels of the point light source target from the rightmost center position and combining a corresponding formula. In addition, the method has the advantages of simple realization of the simultaneous measurement process, small calculation amount and good application in engineering practice.
Drawings
FIG. 1 is a schematic flow chart of the process of the present invention.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Referring to fig. 1, the method employs the following steps:
1) and (3) horizontal test and calibration of a rotary table: the level meter is placed on the rotary table, the azimuth and the pitching position of the rotary table are adjusted, and the rotary table surface is always in a horizontal state when the rotary table rotates in the azimuth;
2) placing an infrared detector (with resolution M multiplied by N) with an infrared imaging circuit and a test lens on a turntable, and aligning a parallel light tube point light source target (the point light source target imaging size diameter is not more than 3 pixels) for clear imaging;
3) sending a command to the infrared imaging circuit to enable the image to be full-screen crossed (the center of the cross is superposed with the center of the image), and rotating the azimuth state of the turntable to enable the center of a point light source target in the image to be at the leftmost side of the image and fall on the cross line;
4) rotating the rotary table in the azimuth state to enable the point light source target in the image to be at the rightmost side of the image, enabling the center of the point light source target to be on the cross line by moving the cross line up and down, and recording the number delta of pixels of the cross line moving up and down;
5) by the formula
And calculating to obtain the roll angle theta of the infrared detector.
The specific implementation method comprises the following steps:
1) and (3) horizontal test and calibration of a rotary table: the level meter is placed on the rotary table, the azimuth and the pitching position of the rotary table are adjusted, and the rotary table surface is always in a horizontal state when the rotary table rotates in the azimuth;
2) placing an infrared detector (with resolution M multiplied by N) with an infrared imaging circuit and a test lens on a turntable, and aligning a parallel light tube point light source target (the point light source target imaging size diameter is not more than 3 pixels) for clear imaging;
3) sending a command to the infrared imaging circuit to enable the image to be full-screen crossed (the center of the cross is superposed with the center of the image), and rotating the azimuth state of the turntable to enable the center of a point light source target in the image to be at the leftmost side of the image and fall on the cross line;
4) rotating the rotary table in the azimuth state to enable the point light source target in the image to be at the rightmost side of the image, enabling the center of the point light source target to be on the cross line by moving the cross line up and down, and recording the number delta of pixels of the cross line moving up and down;
5) by the formula
And calculating to obtain the roll angle theta of the infrared detector.
Claims (4)
1. A roll angle measurement method of an infrared detector is characterized by comprising the following steps:
step 1: and (3) carrying out horizontal test calibration on the rotary table:
step 2: placing an infrared detector with an infrared imaging circuit and a test lens on a turntable, and aligning a parallel light tube point light source to clearly image a target;
and step 3: sending a command to the infrared imaging circuit to enable the image to be full-screen crossed, and rotating the azimuth state of the turntable to enable the center of a point light source target in the image to be at the leftmost side of the image and to fall on a cross line;
and 4, step 4: the position of the cross line is moved up and down to enable the center of the point-like light source target to fall on the cross line, and the number delta of pixels moved up and down of the cross line is recorded;
and 5: by the formula
And calculating to obtain the roll angle theta of the infrared detector.
2. The method as claimed in claim 1, wherein in step 1, the leveling test is calibrated by placing the level gauge on the turntable, and adjusting the azimuth and the pitch position of the turntable to ensure that the turntable surface is always horizontal when the turntable rotates in azimuth.
3. The infrared detector roll angle measurement method of claim 1, wherein in step 2, the target imaging size diameter of the point light source is not more than 3 pixels.
4. The infrared detector roll angle measurement method of claim 1, wherein the cross center of the full-screen cross of the image coincides with the image center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111288162.6A CN114166357B (en) | 2021-11-02 | Infrared detector roll angle measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111288162.6A CN114166357B (en) | 2021-11-02 | Infrared detector roll angle measuring method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114166357A true CN114166357A (en) | 2022-03-11 |
| CN114166357B CN114166357B (en) | 2024-07-02 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016106954A1 (en) * | 2014-12-30 | 2016-07-07 | 华中科技大学 | Low-orbit satellite-borne spectrogram correlation detection method and load |
| CN106706139A (en) * | 2017-02-10 | 2017-05-24 | 西安中科飞图光电科技有限公司 | High-precision infrared imaging system imaging plane docking device and method |
| WO2019138646A1 (en) * | 2018-01-10 | 2019-07-18 | ソニー株式会社 | Calibration device, calibration method, and calibration chart device |
| CN112747745A (en) * | 2020-12-25 | 2021-05-04 | 长春理工大学 | Target characteristic parameter measuring device and method |
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016106954A1 (en) * | 2014-12-30 | 2016-07-07 | 华中科技大学 | Low-orbit satellite-borne spectrogram correlation detection method and load |
| CN106706139A (en) * | 2017-02-10 | 2017-05-24 | 西安中科飞图光电科技有限公司 | High-precision infrared imaging system imaging plane docking device and method |
| WO2019138646A1 (en) * | 2018-01-10 | 2019-07-18 | ソニー株式会社 | Calibration device, calibration method, and calibration chart device |
| CN112747745A (en) * | 2020-12-25 | 2021-05-04 | 长春理工大学 | Target characteristic parameter measuring device and method |
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