CN105092212A - Array corner reflector pointing accuracy measurement system and method - Google Patents

Abstract

The invention relates to an array corner reflector pointing accuracy measurement system and method, which includes a light source, a star point plate, a parallel light pipe, a semi-transparent and semi-reflective plane mirror, a shrinking lens, a filter, a CCD camera and a PC. The light source passes through the star point plate. , the parallel light pipe emits parallel light, and the parallel light is perpendicularly incident on the semi-transparent plane mirror. The array corner reflector to be tested is located on the reflective light path of the semi-transparent plane mirror, and shrinking beams are placed on the transmission light path of the semi-transparent plane mirror. Lens, filter and CCD component, the CCD component is connected to the PC. The present invention solves the technical problems of complicated measurement process and low measurement efficiency in existing methods for measuring the pointing accuracy of corner cubes of array corner reflectors. The present invention can directly measure the pointing accuracy of sub-corner cubes of large-diameter array corner reflectors. There is no need to perform multiple data splicing and interpretations, which reduces errors caused by multiple measurements.

Description

System and method for measuring pointing accuracy of arrayed corner reflectors

technical field

The invention belongs to the field of array corner reflectors, and in particular relates to a pointing precision measurement system and a measurement method for array corner reflectors.

Background technique

The working principle of the corner cube prism: a beam of parallel light enters from one diagonal surface of the corner cube prism, is internally reflected by the other three diagonal surfaces, and then exits from the diagonal surface. It is mainly used in the field of precise measurement.

According to the design requirements and practical applications, array corner reflectors have been used in various fields of aerospace and military. Due to the large number of corner cubes in the array corner reflector, it is required that the pointing accuracy deviation of each corner cube and the intermediate corner cube is less than 10". Correct the corner cubes with large pointing accuracy deviations in time to ensure that the design specifications are met need.

The corner cube prism pointing accuracy inspection method of the existing array corner reflector uses theodolite to utilize the self-collimation method to inspect, although the measurement with low requirements can also be realized, the following defects still exist: 1, the theodolite field of view is small, and the light-through aperture Small, it is necessary to perform multiple measurements, and then compare the results of multiple measurements to judge the deviation of the pointing accuracy, and the measurement process is complicated.

2. The working distance of the theodolite is required to be long, and the cross-differentiated plate image returned by the self-calibration is often relatively weak, the energy is low, and the error in judging the pointing accuracy of the pyramid is relatively large.

3. According to the human eye, the error of pointing accuracy is relatively large, and the reading error is different for different people.

Contents of the invention

In order to solve the technical problems of complex measurement process and low measurement efficiency in the existing method for measuring the pointing accuracy of corner cubes of arrayed corner reflectors, the present invention provides a system and method for measuring pointing accuracy of arrayed corner reflectors.

Technical solution of the present invention:

The array corner reflector pointing accuracy measurement system is special in that it includes a light source, a star point plate, a collimator, a semi-transparent and semi-reflective plane mirror, a shrinking lens, a filter, a CCD camera, and a PC.

The light source emits parallel light through the star point plate and the collimator, and the parallel light is vertically incident on the semi-transparent mirror. A shrinking lens, an optical filter and a CCD assembly are placed in sequence on the road, and the CCD assembly is connected to a PC.

The above-mentioned light sources are incandescent lamps.

The above-mentioned star point plate is placed on the focal plane of the collimator.

The diameter of the center hole of the above-mentioned star point plate is 0.01mm-0.05mm.

The angle between the above-mentioned semi-transparent and semi-reflective plane mirror and the horizontal plane is 45°.

The method for measuring the pointing accuracy of the array corner reflector is special in that it includes the following steps:

1) build the array corner reflector pointing accuracy measurement system described in claim 1;

2) The light source passes through the star point plate and collimator to generate parallel light, which is incident on the semi-transparent and semi-reflective plane mirror;

3) reflected by the semi-transparent and semi-reflective plane mirror to the array corner reflector to be tested, and the array corner reflector to be tested receives the star point image;

4) The array corner reflector to be tested reflects the star point image and enters the narrowing lens through the semi-transparent and semi-reflective plane mirror, and then focuses on the target surface of the CCD component through the filter;

5) Observe the imaging position of the star point image reflected by the reflector at different angles through the screen of the PC, and measure the pointing accuracy:

If the image formed on the PC screen is a star point image, all the corner reflectors of the array corner reflectors point to the same direction;

If the image formed on the PC screen is a multiple star point image, the pointing of all the corner reflectors of the array corner reflector is inconsistent.

The semi-transparent and semi-reflective plane mirror of the system built in the above step 1) is at an angle of 45°, and the specific determination method includes the following steps:

a Utilize the working principle of the pentaprism to establish the 90° benchmark of the position included angle of the first theodolite 9 and the second theodolite 10:

The first theodolite 9 is placed on the incident surface position of the pentaprism, the second theodolite 10 is placed on the pentaprism exit surface position, observes the image plane cross reticle of the second theodolite 10 by the cross reticle of the first theodolite 9, Ensure that the cross centers of the two reticles coincide, and establish the 90° datum of the two theodolites;

b Determine the position of the half-transparent mirror:

The pentaprism in the step a is replaced with a semi-transparent and semi-anti-plane mirror, observe the cross reticle of the second theodolite 10 by the first theodolite 9, the semi-transparent and semi-anti-plane mirror, adjust the semi-transparent and semi-anti-plane mirror position, until the two theodolites The center of the cross reticle coincides, and the position of the semi-transparent and semi-reflective plane mirror at 45° is determined at this moment.

The determination of the position of the array corner reflector to be tested in the system built in the above step 1) includes the following steps:

Place the array corner reflector to be measured at the position of the first theodolite 9 in the above-mentioned steps b, adjust the position of the array corner reflector to be measured, until the self-alignment reflected by the array corner reflector can be observed on the second theodolite 10 The straight image coincides with the center of the cross of the cross differentiation plate of the second theodolite 10, and the position of the array corner reflector is determined.

The method for determining the collimator position of the system built in the above step 1) includes the following steps:

First, place the collimator on the reflective light path perpendicular to the array corner reflector to be measured of the half-transparent mirror, and install an autocollimating telescope at the rear end of the collimator;

Then, through the self-collimating telescope, observe the self-collimating cross image reflected by the semi-transparent and semi-reflective plane mirror and the array corner reflector to be tested, and ensure that the self-collimating cross image and the differentiated cross image of the self-collimating telescope are completely coincident parallel light The position of the tube is determined.

The advantages that the present invention has:

1. The system of the present invention can directly measure the pointing accuracy of the sub-pyramids of the large-aperture array corner reflector without the need for multiple data splicing and interpretation, which reduces the errors caused by multiple measurements.

2. The present invention measures the pointing accuracy of the sub-pyramids of the array corner reflector, after software data processing, the error caused by human factors is reduced, and the measurement accuracy is high.

Description of drawings

Fig. 1 is a schematic structural diagram of the pointing accuracy measurement system of the array corner reflector of the present invention;

Fig. 2 is the optical principle diagram of the present invention;

Fig. 3-Fig. 4 is the schematic diagram of the process of determining the semi-transparent and semi-reflective plane mirror in the present invention;

Fig. 5 is a schematic diagram of the process of determining the array corner reflector to be tested in the present invention;

Fig. 6 is a schematic diagram of the process of determining the collimator in the present invention;

Fig. 7 is a schematic diagram of the process of determining the star point board in the present invention;

Fig. 8 is a schematic diagram of the process of determining the zoom lens in the present invention;

Wherein the reference signs are: 1-array corner reflector to be tested, 2-semi-transparent and semi-reflective plane mirror, 3-light source, 4-star plate, 5-collimator, 6-filter, 7-CCD assembly, 8-PC, 9-the first theodolite, 10-the second theodolite, 11-penta prism, 12-autocollimating telescope, 13-beam reduction lens.

Detailed ways

Example 1:

As shown in Figure 1, the structural diagram of the pointing accuracy measurement system of the array corner reflector, including the light source 3, the star point plate 4, the collimator 5, the semi-transparent and semi-reflective plane mirror 2, the beam reduction lens 13, the optical filter 6, and the CCD Camera 7 and PC 8, the light source sends parallel light through the star point plate and collimator, the parallel light is vertically incident on the semi-transparent mirror, and the array corner reflector 1 to be tested is located on the reflected light path of the semi-transparent mirror. A shrinking lens, a filter and a CCD assembly are placed in sequence on the transmitted light path of the half mirror, and the CCD assembly is connected to a PC.

The star point plate 3 exits the parallel light path through the parallel light tube, and the parallel light is refracted to the angular array reflector to be measured through the semi-transparent and semi-reflective plane mirror, and the array angle reflector to be measured reflects the received star point image and passes through the semi-transparent and semi-reflective The plane mirror enters the measurement narrowing lens, and then focuses on the target surface of the CCD component through the filter sheet (mainly to control the strength of the signal received by the CCD component), and observes the star point images reflected by the reflectors at different angles through the screen of the PC. position, if all the corner reflectors point to the same point, the image formed on the PC screen will form a star point image, if not, many star point images will be formed.

The star point plate is placed on the focal plane of the light pipe and is an accessory of the collimator. The light passes through the central hole of the star point plate to form a spot, and then the spot forms a target source on the focal plane of the collimator)

By adjusting the positional relationship of the corner cube prism of the array corner reflector, the star point image is controlled to be displayed on the screen within a certain area to achieve the purpose of detecting the pointing accuracy of the array corner reflector.

Embodiment 2: The process of building the pointing accuracy measurement system of the array corner reflector:

1. Determination of the 45° angle position of the semi-transparent and semi-reflective plane mirror:

1. Utilize the working principle of pentaprism 11 to establish the 90° benchmark of the position included angle of the first theodolite 9 and the second theodolite 10:

Place the pentaprism 11 by the position shown in Figure 3, then the first theodolite 9 is placed on the front end face (incident surface aperture) of the pentaprism 11, the second theodolite 10 is placed on the pentaprism 11 exit surface position, by the first theodolite 9 Observation of the cross reticle of the second theodolite 10 on the image plane cross reticle of the second theodolite ensures that the cross centers of the two reticles coincide, and establishes the 90° reference of the two theodolites.

2, determine the semi-transparent and semi-anti-plane mirror position: after determining the relative positions of the two theodolites, the pentaprism 11 is replaced with the semi-transparent and semi-anti-plane mirror 2 (position as shown in Figure 4), through the first theodolite 9, the semi-transparent and semi-anti-plane mirrors Anti-plane mirror 2 observes the cross reticle of the second theodolite 10, adjusts the position of semi-transparent and semi-anti-plane mirror 2, until the differentiation cross center of two theodolites coincides, the position of semi-transparent and semi-anti-plane mirror 45 ° can be determined

2. Determine the position of the array corner reflector: After determining the position of the transflective mirror 2, replace the first theodolite 9 with the array corner reflector 1 to be measured, as shown in FIG. 5 . Adjust the position of the corner reflector until the self-collimation image reflected by the array corner reflector to be measured coincides with the center of the cross of the second theodolite 10 on the second theodolite 10, the array corner reflector to be measured The location is OK.

3. Determine the position of the collimator

After determining the position of the array corner reflector to be tested, place the collimator 5 at the position shown in Figure 6, and install the autocollimating telescope 12 on the rear end face of the collimator 5, and observe through the selfcollimating telescope 12 through the translucent The position of the collimator can be determined by ensuring that the two self-collimating cross-images and the differentiated cross-image of the self-collimating telescope completely coincide with the self-collimating cross image reflected by the semi-reflective plane mirror and the array corner reflector to be tested.

4. Determine the position of the star point plate: After determining the position of the collimator, take off the self-collimating telescope 12, then disassemble the self-collimating telescope 12 from the collimator, and then install the star point plate (star point Hole diameter 0.05mm) is placed on the focal plane position of the collimated light pipe, and a 100W incandescent lamp is placed on the rear end of the light pipe as a light source, as shown in Figure 7.

5. Place the attenuator lens 13 at the position shown in FIG. 8 to ensure that the caliber of the array corner reflector to be tested is filled with the attenuator lens caliber. Lap the optical filter and CCD assembly in the system.

In this way, the system overlapping of the pointing accuracy of the whole detection array corner reflector corner cube is completed.

Example 3:

The method for measuring pointing accuracy of an array corner reflector comprises the following steps:

1) Build a pointing accuracy measurement system for arrayed corner reflectors;

2) The light source passes through the star point plate and collimator to generate parallel light, which is incident on the semi-transparent and semi-reflective plane mirror;

3) reflected by the semi-transparent and semi-reflective plane mirror to the array corner reflector to be tested, and the array corner reflector to be tested receives the star point image;

4) The array corner reflector to be tested reflects the star point image and enters the narrowing lens through the semi-transparent and semi-reflective plane mirror, and then focuses on the target surface of the CCD component through the filter;

5) Observe the imaging position of the star point image reflected by the reflector at different angles through the screen of the PC, and measure the pointing accuracy:

If the image formed on the PC screen is a star point image, all the corner reflectors of the array corner reflectors point to the same direction;

If the image formed on the PC screen is a multiple star point image, the pointing of all the corner reflectors of the array corner reflector is inconsistent.

Claims (9)

1. array corner reflector pointing accuracy measuring system, is characterized in that: comprise light source, star tester, parallel light tube, semi-transparent semi-reflecting level crossing, beam-shrinked mirror head, optical filter, CCD camera and PC,

Described light source sends directional light through star tester, parallel light tube, the semi-transparent semi-reflecting level crossing of directional light vertical incidence, array corner reflector to be measured is positioned on the reflected light path of semi-transparent semi-reflecting level crossing, the transmitted light path of semi-transparent semi-reflecting level crossing is placed with successively beam-shrinked mirror head, optical filter and CCD assembly, described CCD assembly is connected with PC.

2. array corner reflector pointing accuracy measuring system according to claim 1, is characterized in that: described light source is incandescent lamp.

3. array corner reflector pointing accuracy measuring system according to claim 2, is characterized in that: described star tester is placed on the position of focal plane of parallel light tube.

4. array corner reflector pointing accuracy measuring system according to claim 3, is characterized in that: the center-hole diameter of described star tester is 0.01mm-0.05mm.

5., according to the arbitrary described array corner reflector pointing accuracy measuring system of claim 1-4, it is characterized in that: described semi-transparent semi-reflecting level crossing be 45 ° with the angle of surface level.

6. array corner reflector pointing accuracy measuring method, is characterized in that: comprise the following steps:

1) array corner reflector pointing accuracy measuring system according to claim 1 is built;

2) light source produces directional light, incident semi-transparent semi-reflecting level crossing through star tester and parallel light tube;

3) through semi-transparent semi-reflecting flat mirror reflects extremely array corner reflector to be measured, array corner reflector to be measured receives asterism picture;

4) array corner reflector to be measured enters beam-shrinked mirror head through semi-transparent semi-reflecting level crossing after being reflected by asterism picture, and then mating plate focuses on the target surface of CCD assembly after filtration;

5) by the asterism of the different corner reflector reflection of the screen viewing of PC as image space, measure pointing accuracy:

If the picture that PC screen becomes is an asterism picture, then the sensing of the corner reflector that array corner reflector is all is consistent;

If the picture that PC screen becomes is multiple asterism picture, then the sensing of the corner reflector that array corner reflector is all is inconsistent.

7. array corner reflector pointing accuracy measuring method according to claim 6, is characterized in that: step 1) in build system semi-transparent semi-reflecting level crossing be in 45° angle position, concrete defining method comprise the following steps into:

A utilizes pentaprism principle of work to set up position angle 90 ° of benchmark of the first transit and the second transit:

First transit is placed on the plane of incidence position of pentaprism, second transit is placed on pentaprism exit facet position, the image planes cross-graduation plate of the second transit is observed by the cross-graduation plate of the first transit, ensure that two graticule cross searching overlap, set up 90 ° of benchmark of two transits;

B determines semi-transparent semi-reflecting mirror position:

Pentaprism in step a is replaced by semi-transparent semi-reflecting level crossing, the cross-graduation plate of the second transit is observed by the first transit, semi-transparent semi-reflecting level crossing, adjust semi-transparent semi-reflecting mirror position, until the cross-graduation plate center superposition of two transits, now the position of semi-transparent semi-reflecting level crossing 45 ° is determined.

8. the array corner reflector pointing accuracy measuring method according to claim 6 or 8, is characterized in that: step 1) in build system array corner reflector position to be measured determine to comprise the following steps into:

Array corner reflector to be measured is placed in the position of the first transit in above-mentioned steps b, adjust the position of array corner reflector to be measured, until the cross differentiation plate cross searching observing autocollimation picture that array corner reflector reflects and the second transit on the second transit overlaps, the position of array corner reflector is determined.

9. array corner reflector pointing accuracy measuring method according to claim 8, is characterized in that: step 1) in build system parallel light tube location determining method comprise the following steps into:

First, parallel light tube is placed on the reflected light path vertical with array corner reflector to be measured of semi-transparent semi-reflecting level crossing, and in the rear end of parallel light tube, auto-collimator is installed;

Then, observed the autocollimation cross picture reflected by semi-transparent semi-reflecting level crossing and array corner reflector to be measured by auto-collimator, ensure that autocollimation is determined as overlap the completely position of parallel light tube of the differentiation cross picture of cross picture and auto-collimator.