CN114323061A - On-spot calibrating device of starlight simulator geometric parameters and system - Google Patents
On-spot calibrating device of starlight simulator geometric parameters and system Download PDFInfo
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Abstract
The invention discloses a device and a system for on-site calibration of geometric parameters of a starlight simulator, wherein the device comprises an optical element, a translation mechanism, an image acquisition device and a data processing device; the optical element is arranged on the translation mechanism, and the image acquisition device is arranged at one end of the translation mechanism; the optical element is used for folding emergent light of the starlight simulator to be calibrated, the translation mechanism is used for driving the optical element and the image acquisition device to translate, the image acquisition device is used for acquiring starlight images formed after the emergent light is folded by the optical element in the translation process and sending the starlight images to the data processing device, and the data processing device is used for calculating the parallelism of the starlight simulator to be calibrated according to the starlight images; the device does not need to use a collimator, avoids human eye alignment and reading errors, and improves the accuracy and reliability of the collimation degree calibration of the starlight simulator.
Description
Technical Field
The invention relates to the technical field of optical testing, in particular to a device and a system for on-site calibration of geometric parameters of a starlight simulator.
Background
The spacecraft utilizes the starlight positioning navigation technology as a new method for autonomous navigation of the spacecraft. The method does not depend on navigation means such as radio, GPS and the like, and has very important application in deep space exploration and ground-surrounding flight of the spacecraft, so that astronomical navigation technology is deeply researched at home and abroad. However, experimental study of the spacecraft by using the astronomical positioning and navigation technology is difficult and expensive, so that ground semi-physical simulation is adopted for experimental study at home and abroad. By utilizing the semi-physical simulation experiment system for spacecraft astronomical navigation, the key positioning navigation technology of the spacecraft can be deeply researched, and the measurement information and the error characteristics thereof can be accurately simulated, so that the effectiveness and the accuracy of the astronomical navigation method can be accurately verified, and the system accuracy can be analyzed.
The star simulator is used as ground parameter correction and function detection equipment of the star sensor, and has great influence on the positioning precision of the star sensor. Therefore, the calibration of the starlight simulator is a very important task. Since the star can be regarded as a point light source at infinity, when the star sensor actually works, the star light is treated as parallel light, so that the emergent light of the star simulator needs to be parallel light, and in practice, the star simulator generally generates the parallel light by placing the point light source on the focal plane of the collimator. Due to the existence of various errors, the parallelism error of the parallel light generated by directly adopting the method is larger, so that the starlight simulator needs to be corrected, and the parallelism of the emergent light of the starlight simulator can meet the requirement of the ground test of the star sensor.
The conventional method for correcting the parallelism of the starlight simulator adopts a mode of adding an optical autocollimator to carry out adjustment, emergent light of a single starlight source is emitted through an optical system to form parallel light with a certain field angle, the optical element is placed on a one-dimensional guide rail, the optical element is translated from one side of a light outlet of the starlight simulator to the other side, the emergent parallel light is bent by 90 degrees in the process and enters the optical autocollimator, the moving angle difference of a single starlight spot in the moving process of a pentaprism is read by a human eye matched with an autocollimator reticle and is recorded as the parallelism, but the method has the defects of weak energy of the single starlight source, alignment and reading errors of the human eye, self-adjustment errors of the autocollimator and the like, the measurement uncertainty value is larger, for the high-precision starlight simulator, the measurement uncertainty value can not meet the requirements of design and simulation, and the method is complex to operate, the requirement on the adjusting field is high.
Disclosure of Invention
The invention provides a device and a system for on-site calibration of geometric parameters of a starlight simulator, which are used for solving the problems of large error and low precision in the calibration of the starlight simulator in the prior art.
A star simulator geometric parameter on-site calibration device comprises an optical element, a translation mechanism, an image acquisition device and a data processing device;
the optical element is arranged on the translation mechanism, and the image acquisition device is arranged at one end of the translation mechanism;
the optical element is used for folding emergent light of the starlight simulator to be calibrated, the translation mechanism is used for driving the optical element and the image acquisition device to translate, the image acquisition device is used for acquiring starlight images formed after the emergent light is folded by the optical element in the translation process and sending the starlight images to the data processing device, and the data processing device is used for calculating the parallelism of the starlight simulator to be calibrated according to the starlight images.
Further, the optical element is a pentaprism.
Further, the image acquisition device is a CCD camera.
Further, the stroke of the translation mechanism is 300mm, and the straightness is 0.01 mm-300 mm.
Further, the data processing device is an industrial control computer.
Further, the calibration device further comprises an optical platform, and the translation mechanism is arranged on the optical platform.
Further, the parallelism of the starlight simulator to be calibrated is calculated by the following formula:
α＝|n1-n2|×α0；
wherein n is1The central pixel coordinates of the star point image quality at one end of the starlight simulator to be calibrated; n is2The central pixel coordinates of the star point image quality at the other end of the starlight simulator to be calibrated; alpha is alpha0The angle corresponding to a single pixel of the starlight simulator to be calibrated is shown, and alpha is the parallelism of the starlight simulator to be calibrated.
A star simulator geometric parameter field calibration system comprises the star simulator geometric parameter field calibration device and a star simulator to be calibrated.
The device and the system for calibrating the geometric parameters of the starlight simulator on site provided by the invention at least have the following beneficial effects:
(1) a collimator is not needed, so that human eye alignment and reading errors are avoided, and the accuracy and reliability of the collimation degree calibration of the starlight simulator are improved;
(2) the method is suitable for a high-precision starlight simulator, can provide parallelism numerical values of the starlight simulator in the horizontal and vertical directions, provides real-time and accurate geometric optical information for the adjustment of the starlight simulator, and ensures the collimation degree of emergent light of the starlight simulator.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a star simulator geometric parameter field calibration system provided by the present invention.
Detailed description of the preferred embodiments
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Referring to fig. 1, in some embodiments, there is provided a star simulator geometric parameter field calibration apparatus, including an optical element 1, a translation mechanism 2, an image acquisition device 3 and a data processing device 4;
the optical element 1 is arranged on the translation mechanism 2, and the image acquisition device 3 is arranged at one end of the translation mechanism 2;
the optical element 1 is used for folding emergent light of the starlight simulator 10 to be calibrated, the translation mechanism 2 is used for driving the optical element 1 and the image acquisition device 3 to translate, the image acquisition device 3 is used for acquiring starlight images formed after the emergent light is folded through the optical element 1 in the translation process and sending the starlight images to the data processing device 4, and the data processing device 4 is used for calculating the parallelism of the starlight simulator 10 to be calibrated according to the starlight images.
In some embodiments, the optical element 1 is a pentaprism, which may be an edmont 25mm by 25mm standard clear aperture pentaprism with a 0.1 "folded optic axis precision.
The pentaprism is a 2-time reflecting prism, an imaging coordinate system of the starlight simulator is unchanged after the reflection of the pentaprism, no mirror image or inverted image exists, only the optical axis is bent to 90 degrees and is emitted from the light outlet, and the push-scanning sampling of the light outlet of the starlight simulator can be realized by matching with a translation mechanism.
In some embodiments, the image capturing device 3 is a CCD camera, the operating band is a visible light band, and the CCD camera may be a 400-ten-thousand-pixel CCD industrial area-array camera with HIK, a focal length of 15mm and an effective resolution of 1980 × 1980.
In some embodiments, the translation mechanism 2 is a river cloud photoelectric high-precision one-dimensional translation mechanism, the stroke is 300mm, the straightness is 0.01mm to 300mm, and translation in both horizontal and vertical directions can be realized.
In some embodiments, the data processing apparatus 4 is an industrial computer.
In some embodiments, the calibration device further comprises an optical bench 5, the translation mechanism 2 and the data processing device 4 being arranged on the optical bench 5.
In some embodiments, the principle of operation of the calibration device is as follows:
the starlight simulator 10 to be calibrated simulates a starlight source, the brightness is adjusted to the maximum value, the light outlet of the starlight simulator 10 to be calibrated aligns with the optical element 1, the lens of the image acquisition device 3 aligns with the optical element 1, the data processing device 4 controls the translation mechanism 2 to perform horizontal and vertical push-scanning, the emergent light of the starlight simulator 10 to be calibrated in the push-scanning process is turned by 90 degrees through the optical element 1 to form a starlight image, the image acquisition device 3 acquires the starlight image and sends the starlight image to the data processing device 4, the data processing device calculates the parallelism of the starlight simulator 10 to be calibrated according to the starlight image, and the parallelism of the starlight simulator to be calibrated is calculated through the following formula:
α＝|n1-n2|×α0；
wherein n is1The central pixel coordinates of the star point image quality at one end of the starlight simulator to be calibrated; n is2The central pixel coordinates of the star point image quality at the other end of the starlight simulator to be calibrated; alpha is alpha0The angle corresponding to a single pixel of the starlight simulator to be calibrated is shown, and alpha is the parallelism of the starlight simulator to be calibrated.
In some embodiments, a star light simulator geometric parameter field calibration system is further provided, which includes the star light simulator geometric parameter field calibration apparatus described above, and further includes a star light simulator 10 to be calibrated.
The device and the system for on-site calibration of the geometric parameters of the starlight simulator provided in some embodiments at least have the following beneficial effects:
(1) a collimator is not needed, so that human eye alignment and reading errors are avoided, and the accuracy and reliability of the collimation degree calibration of the starlight simulator are improved;
(2) the method is suitable for a high-precision starlight simulator, can provide parallelism numerical values of the starlight simulator in the horizontal and vertical directions, provides real-time and accurate geometric optical information for the adjustment of the starlight simulator, and ensures the collimation degree of emergent light of the starlight simulator.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A star simulator geometric parameter on-site calibration device is characterized by comprising an optical element, a translation mechanism, an image acquisition device and a data processing device;
the optical element is arranged on the translation mechanism, and the image acquisition device is arranged at one end of the translation mechanism;
the optical element is used for folding emergent light of the starlight simulator to be calibrated, the translation mechanism is used for driving the optical element and the image acquisition device to translate, the image acquisition device is used for acquiring starlight images formed after the emergent light is folded by the optical element in the translation process and sending the starlight images to the data processing device, and the data processing device is used for calculating the parallelism of the starlight simulator to be calibrated according to the starlight images.
2. The star light simulator geometric parameter field calibration device of claim 1, wherein the optical element is a pentaprism.
3. The on-site calibration device for geometric parameters of a starlight simulator according to claim 1, wherein the image acquisition device is a CCD camera.
4. The on-site calibration device for geometric parameters of a star light simulator according to claim 1, wherein the stroke of the translation mechanism is 300mm and the straightness is 0.01mm to 300 mm.
5. The on-site calibration device for the geometric parameters of the starlight simulator according to claim 1, wherein the data processing device is an industrial control computer.
6. The on-site calibration device for geometric parameters of a star light simulator according to claim 1, further comprising an optical platform, wherein the translation mechanism is disposed on the optical platform.
7. The on-site calibration device for the geometric parameters of the starlight simulator according to claim 1, wherein the parallelism of the starlight simulator to be calibrated is calculated by the following formula:
α＝|n1-n2|×α0；
wherein n is1The central pixel coordinates of the star point image quality at one end of the starlight simulator to be calibrated; n is2The central pixel coordinates of the star point image quality at the other end of the starlight simulator to be calibrated; alpha is alpha0The angle corresponding to a single pixel of the starlight simulator to be calibrated is shown, and alpha is the parallelism of the starlight simulator to be calibrated.
8. An on-site calibration system for geometric parameters of a starlight simulator, which comprises the on-site calibration device for geometric parameters of the starlight simulator as claimed in any one of claims 1 to 7, and further comprises the starlight simulator to be calibrated.
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