CN108519054B - calibration device and calibration method for arc-shaped infrared target simulator - Google Patents

calibration device and calibration method for arc-shaped infrared target simulator Download PDF

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Publication number
CN108519054B
CN108519054B CN201810373986.5A CN201810373986A CN108519054B CN 108519054 B CN108519054 B CN 108519054B CN 201810373986 A CN201810373986 A CN 201810373986A CN 108519054 B CN108519054 B CN 108519054B
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infrared
target
arc
goniometer
target simulator
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CN108519054A (en
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王加科
张磊
刘成功
贺文俊
郑阳
胡源
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Changchun University of Science and Technology
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Changchun University of Science and Technology
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical means
    • G01B11/002Measuring arrangements characterised by the use of optical means for measuring two or more coordinates
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical means
    • G01B11/08Measuring arrangements characterised by the use of optical means for measuring diameters
    • G01B11/12Measuring arrangements characterised by the use of optical means for measuring diameters internal diameters
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical means
    • G01B11/26Measuring arrangements characterised by the use of optical means for measuring angles or tapers; for testing the alignment of axes
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00Radiation pyrometry
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00Radiation pyrometry
    • G01J2005/0048Calibrating; Correcting

Abstract

calibration device and calibration method of circular arc infrared target simulator belongs to infrared target simulator technical field, in order to the demand of prior art, the device includes: the device comprises an arc-shaped infrared target simulator, a high-precision adjusting mechanism, a test base, an infrared goniometer and a triangular bracket, wherein the high-precision adjusting mechanism is positioned on the test base, and the arc-shaped infrared target simulator is fixed on the high-precision adjusting mechanism; the infrared goniometer is arranged at a certain distance behind the circular arc infrared target simulator, is arranged on the triangular bracket and is at the same height with the optical axis of the circular arc infrared target simulator; when the target of the infrared band of the circular arc infrared target simulator is emergent as parallel light, calibrating a target point generated by the circular arc infrared target simulator by using an infrared goniometer; according to the scheme, aiming errors caused by the change of the brightness and the darkness of the edge of the target arc section are effectively reduced by a method of presetting a circular hole above the target arc section; the operation is simple, and the calibration work can be directly finished indoors.

Description

Calibration device and calibration method for arc-shaped infrared target simulator
Technical Field
the invention relates to a calibration device and a calibration method of an arc-shaped infrared target simulator, and belongs to the technical field of infrared target simulators.
Background
In recent years, semi-physical simulation becomes an important means of scientific research, and with the development of infrared detection technology, an infrared target simulator is used as an important instrument of optical testing, can simulate infrared thermal images of real targets, and provides accurate, controllable and repeatable test conditions for testing and evaluating the performance of infrared detection equipment. Therefore, the calibration device and the calibration method with excellent design performance play a very important role in the application of the infrared target detection and positioning system.
disclosure of Invention
The invention provides a calibration device and a calibration method of an arc-shaped infrared target simulator aiming at the requirements of the prior art.
The technical scheme of the invention is as follows:
Calibration device of circular arc infrared target simulator, characterized by, the device includes: the device comprises an arc-shaped infrared target simulator, a high-precision adjusting mechanism, a test base, an infrared goniometer and a triangular bracket, wherein the high-precision adjusting mechanism is positioned on the test base, and the arc-shaped infrared target simulator is fixed on the high-precision adjusting mechanism; the infrared goniometer is arranged at a certain distance behind the circular arc infrared target simulator, is arranged on the triangular bracket and is at the same height with the optical axis of the circular arc infrared target simulator; when the target of the infrared band of the circular arc infrared target simulator is emergent as parallel light, the infrared goniometer is used for calibrating the target point generated by the circular arc infrared target simulator.
The arc-shaped infrared target simulator comprises: the infrared target pattern simulation system comprises a black body radiation source, an optical filter, an infrared reticle and an infrared collimation optical system, wherein infrared radiation emitted by the black body radiation source passes through the optical filter and then outputs a spectrum matched with a spectrum of the infrared collimation system, then an infrared target pattern to be simulated is formed through the infrared reticle, parallel light is emitted from light rays emitted by the infrared reticle through the collimation optical system, and finally the infinite infrared target pattern to be simulated is formed.
The calibration method of the circular arc infrared target simulator is characterized by comprising the following steps:
Step one, mounting a device to be calibrated, mounting and fixing an arc-shaped infrared target simulator on a high-precision adjusting mechanism, and adjusting the high-precision adjusting mechanism to a proper height;
Aligning the circular arc-shaped infrared target simulator with an infrared goniometer and calibrating the angle of a target point;
Firstly, fixing an infrared goniometer on a triangular bracket, then adjusting the height of the triangular bracket to enable the optical axis of the infrared goniometer and the optical axis of the arc-shaped infrared target simulator to be adjusted to be at the same height, then adjusting a fine adjustment knob of the triangular bracket to enable the reading of the infrared goniometer to be displayed as 0, and enabling the infrared goniometer to be horizontal to the ground; then, a reflector is placed on a plane with the same height as the infrared goniometer, a button of the infrared goniometer is clicked to lighten the cross-shaped lineation of the focal plane of the objective lens, the objective lens is focused to infinity, and clear cross-shaped lineation can be observed at the moment; selecting a central point O of a cross division line of an infrared division plate as a reference point, adjusting an infrared measuring angle 4 to enable the cross division line to be aligned with the central point O of the infrared division plate in the arc-shaped infrared target simulator, resetting the reading at the moment to be used as a reference for subsequent measurement, and finishing alignment work at the moment;
when the target point of the circular arc infrared target simulator is calibrated, a fine adjustment knob of the infrared goniometer needs to be adjusted to enable a cross-shaped lineation of the infrared goniometer to be completely coincided with the target point to be measured, reading of the infrared goniometer is recorded, multiple times of measurement need to be carried out, measurement results are recorded, angles between each target point and the central point of the infrared reticle are calibrated according to azimuth angles and pitch angles of different measured target points, and calibration of the target angle of the circular arc infrared target simulator is completed;
Step three, fitting the calibrated round hole by using the calibration data obtained in the step one and the step two to obtain a target arc section central coordinate O1 and a target radius r;
Sequentially calibrating target circular holes on the infrared reticle by taking the central point O of the infrared reticle as a reference to obtain coordinate values of the target circular holes, and when the reticle is designed, enabling the geometric central coordinate O1 of a fitting circle of a plurality of circular holes on the infrared reticle to be superposed with the central coordinate of a target arc section, wherein the geometric radius R of the fitting circle of the circular holes is larger than the radius R of a target radian by a standard value X; the circle radius R of the calibrated circular arc infrared target simulator is calculated by fitting the circular hole coordinates on the circle by a least square method, and the formula is as follows:
Wherein (a, b) is the coordinate of the center O1 of the fitting circle,The mean value of the coordinates of the target round hole points is obtained;
And calibrating a geometric center coordinate O1 of a fitting circle obtained by fitting a plurality of circular holes in the steps to represent the coordinate of the center of the target arc section, and subtracting a standard numerical value X from the geometric radius R of the fitting circle obtained by fitting the circular holes to obtain a calibrated value of the target radius R.
the invention has the beneficial effects that:
According to the scheme, infrared radiation emitted by a black body is filtered by an optical filter and then uniformly irradiates an infrared reticle, and light rays emitted by the infrared reticle are converged by a collimating optical system to form parallel light, so that the observation effect on a real target image can be simulated at a limited indoor distance. Because the distance between the observation target and the sensor is different, the imaging size of the observation target on the image surface of the sensor is different, if the observation target does not exceed the field range of the sensor, the observation target is imaged as a full circle on the sensor, and once the whole observation target exceeds the field range of the sensor, the observation target is imaged as an arc section on the sensor. The calibration method comprises the steps of etching a target arc section on an infrared reticle, etching a plurality of equal-size circular holes above the target arc section at a certain distance, and calibrating the target circular holes so as to achieve the purpose of calibrating the circular arc and obtain the center and the radius of the target circular arc.
1. according to the scheme, the aiming error caused by the change of the brightness and the darkness of the edge of the target arc section is effectively reduced by the method of presetting the round hole above the target arc section.
2. according to the scheme, the infrared reticle used in the infrared target simulator is manufactured by using a mask etching method, and the reticle can be replaced at any time according to different target patterns to be simulated to obtain an expected target.
3. The scheme provides a new method for determining the center and the radius of an arc-shaped infrared target, and an infrared goniometer is used for calibrating a target point of an infrared spectrum.
4. the method applies the principle of least square method to carry out circle fitting on the calibrated hole site, and precisely calibrates the coordinate and radius of the circle center.
5. the device related by the method is simple to operate, and can directly finish the calibration work indoors.
drawings
FIG. 1 is a schematic structural diagram of a calibration device of an arc infrared target simulator of the present invention.
Fig. 2 is a schematic structural diagram of the arc-shaped infrared target simulator of the invention.
FIG. 3 is an infrared reticle calibration pattern according to the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
as shown in fig. 1, the calibration device for the circular arc infrared target simulator comprises: the device comprises an arc-shaped infrared target simulator 1, a high-precision adjusting mechanism 2, a test base 3, an infrared goniometer 4 and a triangular support 5, wherein the high-precision adjusting mechanism 2 is positioned on the test base 3, and the arc-shaped infrared target simulator 1 is fixed on the high-precision adjusting mechanism 2. The infrared goniometer 4 is arranged behind the circular arc-shaped infrared target simulator 1 at a certain distance, is arranged on the triangular bracket 5, and is at the same height with the optical axis of the circular arc-shaped infrared target simulator 1. When the target of the infrared band of the circular arc infrared target simulator 1 is emergent as parallel light, the infrared goniometer 4 is used for calibrating the target point generated by the circular arc infrared target simulator 1.
As shown in fig. 2, the structure of the circular arc infrared target simulator 1 mainly includes: the black body radiation source comprises a black body radiation source 1-1, an optical filter 1-2, an infrared reticle 1-3 and an infrared collimation optical system 1-4. Infrared radiation emitted by the black body radiation source 1-1 passes through the optical filter 1-2, then an output spectrum is matched with a spectrum of the infrared collimation system 1-4, an infrared target pattern to be simulated is formed through the infrared reticle 1-3, parallel light is emitted by light rays emitted by the infrared reticle 1-3 through the collimation optical system 1-4, and finally an infinite infrared target pattern to be simulated is formed.
The blackbody radiation source 1-1 provides stable infrared radiation for the whole circular arc infrared simulator 1.
The optical filter 1-2 is used for correcting the spectrum of the blackbody radiation source 1-1 so that the output spectrum of the target simulator is matched with the spectrum to be measured.
the infrared reticle 1-3 is made of a stainless steel sheet with the thickness of 0.05mm, small circular holes in arc arrangement are manufactured in a mask etching mode to serve as target point patterns, and the shape and position precision of the patterns can reach 3 micrometers.
the infrared goniometer 4 is used for calibrating the circular arc infrared target simulator 1 and aims to measure the angle of a target circular hole generated by the black body light source 1-1 through the optical filter 1-2 and the infrared reticle 1-3.
The calibration method of the circular arc infrared target simulator comprises the following steps:
Firstly, mounting a device to be calibrated, and mounting an arc-shaped infrared target simulator 1 on a high-precision adjusting mechanism 2; then, the circular arc-shaped infrared target simulator 1 is fixed to the high-precision adjusting mechanism 2, and the high-precision adjusting mechanism 2 is adjusted to an appropriate height.
And step two, aligning the circular arc-shaped infrared target simulator 1 with the infrared goniometer 4 and calibrating the angle of a target point.
Firstly, fixing the infrared goniometer 4 on a triangular support 5, then adjusting the height of the triangular support 5 to enable the optical axis of the infrared goniometer 4 and the optical axis of the circular arc-shaped infrared target simulator 1 to be adjusted to the same height, then adjusting a fine adjustment knob of the triangular support 5 to enable the reading of the infrared goniometer 4 to be displayed as 0, and at the moment, enabling the infrared goniometer 4 to be horizontal to the ground. Then, a reflector is placed on a plane with the same height as the infrared goniometer 4, a button of the infrared goniometer 4 is clicked to lighten the cross-shaped lineation of the focal plane of the objective lens, the objective lens is focused to infinity, and clear cross-shaped lineation can be observed at the moment. Selecting a central point O of a cross division line of the infrared reticle 1-3 as a datum point, adjusting the infrared goniometer 4 to enable the cross division line to be aligned with the central point O of the infrared reticle 1-3 in the circular arc-shaped infrared target simulator 1, resetting the reading at the moment, using the reading as a datum for subsequent measurement, and finishing alignment work at the moment.
When the target point of the circular arc infrared target simulator 1 is calibrated, a fine adjustment knob of the infrared goniometer 4 needs to be adjusted to enable the cross-shaped lineation of the infrared goniometer 4 to be completely coincided with the target point to be measured, the reading of the infrared goniometer 4 is recorded, multiple times of measurement needs to be carried out, the measurement result is recorded, the angle between each target point and the central point of the infrared reticle 1-3 is calibrated according to the azimuth angle and the pitch angle of different measured target points, and the calibration of the target angle of the circular arc infrared target simulator 1 is completed.
and step three, fitting the calibrated round hole by using the calibration data obtained in the step one and the step two to obtain a target arc section center coordinate O1 and a target radius r.
As shown in fig. 3, the central point O of the infrared reticle 1-3 is used as a reference, the target circular holes on the infrared reticle 1-3 are sequentially calibrated to obtain the coordinate values of the target circular holes, when designing the reticle, the geometric central coordinate O1 of the fitting circle of the plurality of circular holes on the infrared reticle 1-3 is coincided with the central coordinate of the target arc segment, and the geometric radius R of the fitting circle of the circular holes is larger than the target arc radius R by a standard value X. The circle radius R of the calibrated circular arc infrared target simulator 1 is calculated by fitting the circular hole coordinates on the circle by a least square method, and the formula is as follows:
Wherein (a, b) is the coordinate of the center O1 of the fitting circle,Is the average value of the coordinates of the target circular hole points.
And calibrating a geometric center coordinate O1 of a fitting circle obtained by fitting a plurality of circular holes in the steps to represent the coordinate of the center of the target arc section, and subtracting a standard numerical value X from the geometric radius R of the fitting circle obtained by fitting the circular holes to obtain a calibrated value of the target radius R.

Claims (3)

1. the calibration method of the circular arc infrared target simulator is characterized by comprising the following steps:
firstly, mounting a device to be calibrated, mounting and fixing the arc-shaped infrared target simulator (1) on a high-precision adjusting mechanism (2), and adjusting the high-precision adjusting mechanism (2) to a proper height;
Step two, aligning the arc-shaped infrared target simulator (1) with the infrared goniometer (4) and calibrating the angle of a target point;
Firstly, fixing an infrared goniometer (4) on a triangular bracket (5), then adjusting the height of the triangular bracket (5) to enable the optical axis of the infrared goniometer (4) and the optical axis of a circular arc-shaped infrared target simulator (1) to be adjusted to the same height, then adjusting a fine adjustment knob of the triangular bracket (5) to enable the reading of the infrared goniometer (4) to be displayed as 0, and enabling the infrared goniometer (4) to be horizontal to the ground; then, a reflector is placed on a plane with the same height as the infrared goniometer (4), a button of the infrared goniometer (4) is clicked to lighten the cross-shaped lineation of the focal plane of the objective lens, the objective lens is focused to infinity, and clear cross-shaped lineation can be observed at the moment; selecting a cross division line central point O of one infrared division board (1-3) as a reference point, adjusting an infrared goniometer (4) to enable a cross division line to be aligned with the central point O of the infrared division board (1-3) in the arc-shaped infrared target simulator (1), resetting the reading at the moment to serve as a reference for subsequent measurement, and finishing alignment work at the moment;
when a target point of the circular arc infrared target simulator (1) is calibrated, a fine adjustment knob of the infrared goniometer (4) needs to be adjusted to enable a cross-shaped lineation of the infrared goniometer (4) to be completely coincided with the target point to be measured, reading of the infrared goniometer (4) is recorded, multiple times of measurement needs to be carried out, measurement results are recorded, angles between each target point and the central point of the infrared reticle (1-3) are calibrated according to azimuth angles and pitch angles of different measured target points, and calibration of the target angle of the circular arc infrared target simulator (1) is completed;
Step three, fitting the calibrated round hole by using the calibration data obtained in the step one and the step two to obtain a target arc section central coordinate O1 and a target radius r;
Sequentially calibrating target circular holes on the infrared reticle (1-3) by taking a central point O of the infrared reticle (1-3) as a reference to obtain a coordinate value of the target circular hole, and when the reticle is designed, enabling a geometric central coordinate O1 of a fitting circle of a plurality of circular holes on the infrared reticle (1-3) to coincide with a central coordinate of a target arc section, wherein the geometric radius R of the fitting circle of the circular holes is larger than the target arc radius R by a standard value X; the circle radius R of the calibrated circular arc infrared target simulator (1) is calculated by using the least square method to fit the circular hole coordinates on the circle, and the formula is as follows:
Wherein (a, b) is the coordinate of the center O1 of the fitting circle,The mean value of the coordinates of the target round hole points is obtained;
and calibrating a geometric center coordinate O1 of a fitting circle obtained by fitting a plurality of circular holes in the steps to represent the coordinate of the center of the target arc section, and subtracting a standard numerical value X from the geometric radius R of the fitting circle obtained by fitting the circular holes to obtain a calibrated value of the target radius R.
2. The method for calibrating the circular arc infrared target simulator according to claim 1, wherein the device for calibrating the circular arc infrared target simulator used in the method comprises: the device comprises an arc-shaped infrared target simulator (1), a high-precision adjusting mechanism (2), a test base (3), an infrared goniometer (4) and a triangular bracket (5), wherein the high-precision adjusting mechanism (2) is positioned on the test base (3), and the arc-shaped infrared target simulator (1) is fixed on the high-precision adjusting mechanism (2); the infrared goniometer (4) is arranged behind the circular arc-shaped infrared target simulator (1) at a certain distance, is arranged on the triangular bracket (5), and is at the same height with the optical axis of the circular arc-shaped infrared target simulator (1); when the targets in the infrared wave band of the circular arc infrared target simulator (1) are emergent as parallel light, the infrared goniometer (4) is used for calibrating the target points generated by the circular arc infrared target simulator (1).
3. the method for calibrating the circular arc infrared target simulator according to claim 2, wherein the circular arc infrared target simulator (1) in the calibration device of the circular arc infrared target simulator used in the method comprises: the device comprises a black body radiation source (1-1), an optical filter (1-2), an infrared reticle (1-3) and an infrared collimation optical system (1-4), wherein infrared radiation emitted by the black body radiation source (1-1) passes through the optical filter (1-2), then an output spectrum is matched with a spectrum of the infrared collimation system (1-4), an infrared target pattern to be simulated is formed through the infrared reticle (1-3), parallel light is emitted by light rays emitted by the infrared reticle (1-3) through the collimation optical system (1-4), and finally an infinite infrared target pattern to be simulated is formed.
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