CN110926761A - Large-caliber collimator for airborne photoelectric aiming system detection and detection method - Google Patents
Large-caliber collimator for airborne photoelectric aiming system detection and detection method Download PDFInfo
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- CN110926761A CN110926761A CN201911103465.9A CN201911103465A CN110926761A CN 110926761 A CN110926761 A CN 110926761A CN 201911103465 A CN201911103465 A CN 201911103465A CN 110926761 A CN110926761 A CN 110926761A
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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
- G01M11/0221—Testing optical properties by determining the optical axis or position of lenses
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
- G01B11/27—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
- G01B11/272—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes using photoelectric detection means
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Abstract
The invention relates to a large-aperture collimator and a detection method of an onboard photoelectric aiming system, which are used for accurately and quickly detecting the parallelism of optical axes of onboard photoelectric detection equipment carrying multiple sensors such as infrared, television, laser range finders and the like. The laser incidence diaphragm is a special diaphragm, and the shape of the light spot can be modulated into a shape which is more beneficial to high-precision centroid detection. And the control computer collects the image of the detected product for imaging the target surface of the detection device, and the optical axis deviation of each sensor of the detected product is automatically detected by using an optical axis deviation detection algorithm. The device is convenient to use, high in detection precision, good in working stability and high in automation degree, and is suitable for product assembly and adjustment, maintenance and outfield guarantee.
Description
Technical Field
The invention belongs to the field of airborne photoelectric detection and countermeasure, relates to a large-caliber collimator and a detection method for detection of an airborne photoelectric aiming system, and relates to an automatic detection device and a method for multi-optical-axis consistency of the airborne photoelectric aiming system.
Background
Nowadays, most of the airborne photoelectric detection systems include various sensors such as infrared, laser, and visible light. The infrared and television sensors image the target for searching and tracking the target, and the laser sensor is used for actively measuring the distance of the target. In order to ensure that the target tracked by the infrared and television is consistent with the target of laser ranging, the airborne photoelectric detection system has certain parallelism requirements on the infrared, television and laser multiple optical axes. The parallelism indication is an important performance index of the airborne photoelectric detection system and represents the combat efficiency of the airborne photoelectric system.
Due to the influences of factors such as inconsistent installation materials, vibration effect, assembly stress, environmental heat effect and the like, the parallelism of multiple optical axes can be disordered after the product is used for a certain time or in a complex and variable environment. Accurate and rapid detection of multiple optical axes is a precondition for ensuring the parallelism of the multiple optical axes.
At present, the problems of large subjective error of interpretation by human eyes, low detection efficiency due to poor automation degree, complex detection equipment and method, high operation difficulty, incomplete sensor coverage wave band, unsuitability for field environment and the like exist in the aspect of multi-optical axis parallelism detection.
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides a large-caliber collimator tube detected by an airborne photoelectric aiming system and a detection method thereof, and solves the problems of large subjective interpretation error, low automation degree and complex operation of detection equipment and the detection method of the conventional multi-optical-axis detection method.
Technical scheme
A heavy-calibre collimator for detection of an airborne photoelectric aiming system is characterized by comprising a laser incident diaphragm 1, a television/infrared emergent diaphragm 2, a paraboloid primary mirror 3, a paraboloid secondary mirror 4, an infrared laser spectroscope 5, a hot target material 6, a cross target plate 7, a hot light source 8 and a structural box body 9; the light path in the structure box 9 is set as follows: the infrared television window facing the product to be detected is provided with a television/infrared emergent diaphragm 2, the laser emitting window is provided with a laser incident diaphragm 1, a paraboloid primary mirror 3 is arranged behind the two diaphragms, a parabolic concave secondary mirror 4 is arranged on the reflection light path of the primary mirror 3, and an infrared laser spectroscope 5, a cross target plate 7 and a heat light source 8 are sequentially arranged on the reflection light path of the secondary mirror 4; a hot target material 6 is arranged on a reflection light path of the infrared laser spectroscope 5; the hot target material 6 and the cross target plate 7 are arranged on the focal plane of the collimator optical system in a conjugate mode.
The thermal target material 6 is an infrared laser target, and converts absorbed laser energy into infrared radiation.
The cross target plate 7 is a light-tight light barrier, and a light-tight cross-shaped hole is carved in the middle.
The laser incident diaphragm 1 is a circular light barrier with the diameter of 70mm, and an equilateral triangle with the side length of 30mm or an equilateral hexagon light transmission hole with the side length of 15mm is carved in the middle.
The television/infrared incident diaphragm 2 is a circular light transmitting aperture.
A method for detecting the consistency of multiple optical axes by using a large-caliber collimator detected by any airborne photoelectric aiming system is characterized by comprising the following steps:
step 1: roughly aligning the optical axis of the product to be measured with the optical axis of the collimator, wherein the difference between the two is not more than 10% of the total field of view;
step 2: starting a heat light source 8, and enabling light rays to pass through a cross target plate 7, an infrared laser spectroscope 5, a paraboloid secondary mirror 4, a paraboloid primary mirror 3 and a television/infrared emergent diaphragm 2 to reach an infrared television window of a detected product;
and step 3: collecting an infrared image under the laser irradiation state, wherein the target plate cross characters can be observed in the infrared image; and recording the target board "cross" deviation angle (x0, y0) from the infrared image center;
and 4, step 4: collecting a television image in a laser irradiation-free state, wherein the characters of the target plate can be observed in the television image; and recording the angle of deviation of the target plate "cross" with respect to the television image centre (x1, y 1);
and 5: calculating the optical axis deviation of the television relative to the infrared ray, wherein the calculation relationship is x 2-x 0-x1, and y 2-y 0-y 1;
step 6: turning off the heat light source, starting laser emission of a detected product, reflecting laser to a heat target material 6 through a laser incidence diaphragm 1, a paraboloid primary mirror 3, a paraboloid secondary mirror 4 and an infrared laser spectroscope 5 to generate diffraction spots, and converting absorbed laser energy into infrared radiation; the infrared laser spectroscope 5 leads the infrared radiation of the hot target material 6 to an infrared television window of a tested product through the paraboloidal secondary mirror 4, the paraboloidal primary mirror 3 and the television/infrared emergent diaphragm 2;
and 7: collecting an infrared image under the laser irradiation state, wherein diffraction spots crossed by three straight lines of laser diffraction are observed in the infrared image; recording the deviation angle of the diffraction spot center relative to the infrared image center, namely the laser beam parallelism deviation (x3, y3) relative to the infrared optical axis;
and 8: calculating the optical axis deviation of the laser relative to the television, wherein the calculation relationship is x 4-x 3-x2, and y 4-y 3-y 2;
the deviation of the laser light from the infrared and the deviation of the laser light from the television are obtained.
Advantageous effects
The invention provides a large-aperture collimator for detecting an onboard photoelectric aiming system and a detection method thereof, which are used for accurately and quickly detecting the parallelism of optical axes of onboard photoelectric detection equipment carrying multiple sensors such as infrared sensors, televisions, laser range finders and the like. The paraboloid primary mirror and the secondary mirror form an off-axis large-caliber long-focus collimator optical system, and the hot target material and the cross target plate are arranged on the focal plane of the collimator optical system in a conjugate mode. The laser incidence diaphragm is a special diaphragm, and the shape of the light spot can be modulated into a shape which is more beneficial to high-precision centroid detection. And collecting an image of the tested product for imaging the target surface of the collimator, and automatically detecting the optical axis deviation of each sensor of the tested product by using an optical axis deviation detection algorithm. The device is convenient to use, high in detection precision, good in working stability and high in automation degree, and is suitable for product assembly and adjustment, maintenance and outfield guarantee.
Drawings
FIG. 1: schematic diagram of system structure of the invention
FIG. 2: laser diaphragm schematic of the present invention
FIG. 3: laser diffraction light spot schematic diagram of the invention
FIG. 4: schematic diagram of cross target plate diaphragm of the invention
FIG. 5: optical axis detection flow chart of the invention
1-laser incident diaphragm, 2-television/infrared emergent diaphragm, 3-paraboloid primary mirror, 4-paraboloid secondary mirror, 5-infrared laser spectroscope, 6-hot target material, 7-cross target plate, 8-hot light source and 9-structure box body.
Detailed Description
The invention will now be further described with reference to the following examples and drawings:
the large-aperture collimator comprises a laser incident diaphragm, a television/infrared emergent diaphragm, a paraboloid primary mirror, a paraboloid secondary mirror, an infrared laser spectroscope, a hot target material, a cross target plate, a hot light source and a structural box body. The paraboloid primary mirror and the secondary mirror form an off-axis large-caliber long-focus collimator optical system.
The laser incident diaphragm 1 is a circular light barrier with the diameter of 70mm, and an equilateral triangle with the side length of 30mm or an equilateral hexagon light transmission hole with the side length of 15mm is carved in the middle. The laser exit beam passing through an equilateral triangle or an equilateral hexagon will produce a diffraction spot on the hot target material. The shape of the diffraction light spot is a pattern that three straight bright stripes intersect at one point, and the intersection point of the three straight bright stripes is the center point of the laser optical axis. The laser incident diaphragm 1 not only attenuates the outgoing laser energy but also modulates the laser spot incident on the hot target material, so that the spot center is more easily detected from the image.
The television/infrared entrance diaphragm 2 is a circular light transmitting aperture.
The thermal target material 6 is an infrared laser target that converts absorbed laser energy into infrared radiation.
The cross target plate 7 is a lightproof light barrier, and a light-transmitting cross-shaped hole is carved in the middle.
The optical path is set as follows: the light path in the structure box 9 is set as follows: the infrared television window facing the product to be detected is provided with a television/infrared emergent diaphragm 2, the laser emitting window is provided with a laser incident diaphragm 1, a paraboloid primary mirror 3 is arranged behind the two diaphragms, a parabolic concave secondary mirror 4 is arranged on the reflection light path of the primary mirror 3, and an infrared laser spectroscope 5, a cross target plate 7 and a heat light source 8 are sequentially arranged on the reflection light path of the secondary mirror 4; a hot target material 6 is arranged on a reflection light path of the infrared laser spectroscope 5; the hot target material 6 and the cross target plate 7 are arranged on the focal plane of the collimator optical system in a conjugate mode.
The infrared laser spectroscope 5 reflects the converged laser light to the hot target material, can reflect infrared radiation generated from the hot target material, and transmits the infrared radiation generated from the cross target plate 7;
the thermal light source 8 can generate infrared and visible radiation; when the heat light source 8 is started, infrared and visible light radiation is emitted after being collimated by the paraboloidal primary mirror 3 and the paraboloidal secondary mirror 4 through a cross hole in the middle of the cross target plate 7;
connecting the control computer 10 with a detected product through a video line, and collecting an image of the detected product for imaging the target surface of the detection device; the control computer 10 is connected with the heat light source 8 to be turned on or off, and the heat light source 8 in the large-caliber parallel light pipe 11 is controlled to be turned on or off.
The control computer 10 is installed with visual optical axis parallelism detection interface software, which mainly functions to control the whole test process, collect and display the target surface image output by the tested product in real time, and calculate and display the optical axis deviation of each sensor in real time.
The specific steps for detecting the consistency of multiple optical axes of the airborne photoelectric aiming system are as follows:
step 1: firstly, connecting the large-caliber collimator with a tested product by using a cable, and roughly aligning the optical axis of the tested product with the optical axis of the large-caliber collimator to ensure that the inspection between the two does not exceed 10% of the total field of view;
step 2: turning on the thermal light source, and controlling the control computer 10 to turn on the thermal light source 8;
and step 3: acquiring an infrared image under a laser irradiation-free state, wherein the infrared image can be used for observing the cross characters of the target plate;
and 4, step 4: detecting the deviation angle (x0, y0) of the 'cross' of the target plate relative to the center of the infrared image, controlling an image detection algorithm in the computer 10 to quickly detect the position of the 'cross' in the infrared image, and recording the deviation angle (x0, y 0);
and 5: collecting a television image under a laser irradiation-free state, wherein the characters of a target plate, namely 'ten', can be observed in the television image;
step 6: detecting the deviation angle (x1, y1) of the 'cross' of the target plate relative to the center of the television image, controlling an image detection algorithm in the computer 10 to quickly detect the position of the 'cross' in the television image, and recording the deviation angle (x1, y 2);
and 7: the computer 10 is controlled to complete the calculation of the optical axis deviation of the television relative to the infrared ray, and the calculation relationship is x 2-x 0-x1, and y 2-y 0-y 1;
and 8: turning off the heat light source, and controlling the control computer 10 to turn off the heat light source 8;
and step 9: acquiring an infrared image under a laser irradiation state, wherein diffraction spots crossed by three straight lines of laser diffraction can be observed in the infrared image;
step 10: detecting deviation angles (x3, y3) of the centers of the diffraction spots relative to the center of the infrared image, rapidly detecting the positions of the diffraction spots crossed by three straight lines in the infrared image by an image detection algorithm in the control computer 10, and recording deviation angles (x3, y3), wherein the deviation angles are the parallelism deviation of the laser relative to the infrared optical axis;
step 11: the computer 10 is controlled to complete the calculation of the optical axis deviation of the laser relative to the television, and the calculation relationship is x 4-x 3-x2, and y 4-y 3-y 2;
step 12: the control computer 10 displays the laser-to-infrared deviation and the laser-to-television deviation on the interface.
Claims (6)
1. A heavy-calibre collimator for detection of an airborne photoelectric aiming system is characterized by comprising a laser incident diaphragm (1), a television/infrared emergent diaphragm (2), a paraboloid primary mirror (3), a paraboloid secondary mirror (4), an infrared laser spectroscope (5), a hot target material (6), a cross target plate (7), a hot light source (8) and a structural box body (9); the light path in the structure box body (9) is set as follows: the infrared television window facing the product to be detected is provided with a television/infrared emergent diaphragm (2), the laser emission window is provided with a laser incident diaphragm (1), a paraboloid primary mirror (3) is arranged behind the two diaphragms, a parabolic concave secondary mirror (4) is arranged on a reflection light path of the primary mirror (3), and an infrared laser spectroscope (5), a cross target plate (7) and a heat light source (8) are sequentially arranged on a reflection light path of the secondary mirror (4); a hot target material (6) is arranged on a reflection light path of the infrared laser spectroscope (5); the hot target material (6) and the cross target plate (7) are arranged on the focal plane of the collimator optical system in a conjugate mode.
2. The large-aperture collimator detected by the airborne photoelectric aiming system of claim 1, wherein: the thermal target material (6) is an infrared laser target and converts absorbed laser energy into infrared radiation.
3. The large-aperture collimator detected by the airborne photoelectric aiming system of claim 1, wherein: the cross target plate (7) is a light-tight light barrier, and a light-tight cross-shaped hole is carved in the middle.
4. The large-aperture collimator detected by the airborne photoelectric aiming system of claim 1, wherein: the laser incident diaphragm (1) is a circular light barrier with the diameter of 70mm, and an equilateral triangle with the side length of 30mm or an equilateral hexagon light transmission hole with the side length of 15mm is carved in the middle of the light barrier.
5. The large-aperture collimator detected by the airborne photoelectric aiming system of claim 1, wherein: the television/infrared incident diaphragm (2) is a circular light transmitting hole.
6. A method for detecting multi-optical-axis consistency by using a large-caliber collimator detected by an airborne photoelectric aiming system of any one of claims 1-5 is characterized by comprising the following steps:
step 1: roughly aligning the optical axis of the product to be measured with the optical axis of the collimator, wherein the difference between the two is not more than 10% of the total field of view;
step 2: starting a heat light source (8), and enabling light rays to pass through a cross target plate (7), an infrared laser spectroscope (5), a paraboloid secondary mirror (4), a paraboloid primary mirror (3) and a television/infrared emergent diaphragm (2) to reach an infrared television window of a detected product;
and step 3: collecting an infrared image under the laser irradiation state, wherein the target plate cross characters can be observed in the infrared image; and recording the target board "cross" deviation angle (x0, y0) from the infrared image center;
and 4, step 4: collecting a television image in a laser irradiation-free state, wherein the characters of the target plate can be observed in the television image; and recording the angle of deviation of the target plate "cross" with respect to the television image centre (x1, y 1);
and 5: calculating the optical axis deviation of the television relative to the infrared ray, wherein the calculation relationship is x 2-x 0-x1, and y 2-y 0-y 1;
step 6: the heat light source is closed, the laser emission of the tested product is started, the laser is reflected to the heat target material (6) through the laser incidence diaphragm (1), the paraboloid primary mirror (3), the paraboloid secondary mirror (4) and the infrared laser spectroscope (5) to generate diffraction spots, and the absorbed laser energy is converted into infrared radiation; the infrared laser spectroscope (5) leads the infrared radiation of the hot target material (6) to an infrared television window of a tested product through the paraboloidal secondary mirror (4), the paraboloidal primary mirror (3) and the television/infrared emergent diaphragm (2);
and 7: collecting an infrared image under the laser irradiation state, wherein diffraction spots crossed by three straight lines of laser diffraction are observed in the infrared image; recording the deviation angle of the diffraction spot center relative to the infrared image center, namely the laser beam parallelism deviation (x3, y3) relative to the infrared optical axis;
and 8: calculating the optical axis deviation of the laser relative to the television, wherein the calculation relationship is x 4-x 3-x2, and y 4-y 3-y 2;
the deviation of the laser light from the infrared and the deviation of the laser light from the television are obtained.
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Cited By (7)
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| CN112284536A (en) * | 2020-09-15 | 2021-01-29 | 中国科学院上海技术物理研究所 | Visible-infrared spectrum cooperative detection optical system and registration method |
| CN112326198A (en) * | 2020-10-29 | 2021-02-05 | 中国航空工业集团公司洛阳电光设备研究所 | Rapid verification target plate and rapid verification method |
| CN112747904A (en) * | 2020-12-30 | 2021-05-04 | 中国科学院长春光学精密机械与物理研究所 | Method for assembling and adjusting infrared transfer function measuring instrument |
| CN112902881A (en) * | 2021-01-26 | 2021-06-04 | 电子科技大学 | Parallel testing method of multi-optical-axis system based on digital image processing |
| CN113607383A (en) * | 2021-07-07 | 2021-11-05 | 湖北航天技术研究院总体设计所 | Device, system and method for measuring aiming deviation of laser optical axis |
| CN114088350A (en) * | 2021-10-01 | 2022-02-25 | 中航洛阳光电技术有限公司 | Device and method for calibrating split-caliber optical axis and application |
| CN114323571A (en) * | 2021-11-23 | 2022-04-12 | 中国航空工业集团公司洛阳电光设备研究所 | Multi-optical-axis consistency detection method for photoelectric aiming system |
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| CN112902881A (en) * | 2021-01-26 | 2021-06-04 | 电子科技大学 | Parallel testing method of multi-optical-axis system based on digital image processing |
| CN113607383A (en) * | 2021-07-07 | 2021-11-05 | 湖北航天技术研究院总体设计所 | Device, system and method for measuring aiming deviation of laser optical axis |
| CN114088350A (en) * | 2021-10-01 | 2022-02-25 | 中航洛阳光电技术有限公司 | Device and method for calibrating split-caliber optical axis and application |
| CN114088350B (en) * | 2021-10-01 | 2023-10-24 | 中航洛阳光电技术有限公司 | Device, method and application for calibrating split-caliber optical axis |
| CN114323571A (en) * | 2021-11-23 | 2022-04-12 | 中国航空工业集团公司洛阳电光设备研究所 | Multi-optical-axis consistency detection method for photoelectric aiming system |
| CN114323571B (en) * | 2021-11-23 | 2023-09-29 | 中国航空工业集团公司洛阳电光设备研究所 | Multi-optical-axis consistency detection method for photoelectric aiming system |
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Application publication date: 20200327 |