CN106403990B - A kind of light axis consistency caliberating device - Google Patents

Abstract

The invention belongs to the field of photoelectric self-collimation and non-contact angle measurement, and provides a fast and convenient measurement optical path, and an optical axis consistency calibration device for completing the optical axis consistency of the outgoing light rays from a measured aiming prism; an optical axis consistency calibration device , including autocollimator A, two-way electronic level, autocollimator B, test bench and adjustment bracket, dual laser inertial group, aiming prism, arrow body bracket and comprehensive test electric control box, wherein the test bench and The adjustment bracket is a double-layer bracket, and the upper surface of the upper bracket is provided with a cast aluminum shell. The two ends of the cast aluminum shell are respectively provided with an autocollimator A and an autocollimator B. The autocollimator A and the autocollimator A two-way electronic level is arranged between the straight instruments B; a comprehensive test electric control box is arranged on the lower bracket of the test bench and the adjustment bracket; The inertial groups are two laser inertial groups to be tested, and each laser inertial group is respectively provided with a aiming prism.

Description

An optical axis consistency calibration device

technical field

The invention belongs to the field of photoelectric self-collimation non-contact angle measurement, in particular to an optical axis consistency calibration device.

Background technique

At present, the navigation system on the launch vehicle usually selects multiple sets of strapdown inertial groups for redundant guidance in order to improve the navigation accuracy. The initial installation orientation deviation between two or more strapdown inertial groups needs to be accurately calibrated before the rocket flies. A sighting prism representing its navigation coordinate system is installed on the strapdown inertial group, and the calibration of the initial installation orientation deviation of the inertial group can be completed by calibrating the azimuth consistency of the outgoing optical axis of the sighting prism through an external device. This calibration value is finally bound in the onboard computer to participate in the navigation solution.

If the conventional method is adopted, the calibration of the consistency of the outgoing optical axis of the aiming prism is obtained indirectly by means of a network of at least two theodolites. The specific method is that two theodolites are collimated with one aiming prism, and then aligned and aimed at each other to obtain two rotation angles θ ₁ and 360°-θ ₂ , then the initial installation deviation Δ of the two aiming prisms is 180°- (θ ₁ +360°-θ ₂ ).

There are many error terms when using this method to measure. If the visibility conditions of the test site are not good, even more theodolites are needed to form a network for measurement. The main error terms include the instrument errors of multiple theodolites themselves, the aiming errors of the theodolites when aiming, and the focusing errors and alignment errors of each instrument operator. The more the theodolites are, the greater the error. These errors bring 1:1 directly into the measurement results, which seriously affects the accuracy of the measurement results.

The calibration device can not only meet the accurate measurement of the initial attitude of the device under test, but also completely overcome the disadvantages of the above methods, and is less affected by the measurement site environment.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a fast and convenient measuring optical path, aiming at the deficiencies of the prior art, to complete the optical axis consistency calibration device for the optical axis consistency of the light emitted by the aiming prism to be measured.

The technical scheme of the present invention is:

An optical axis consistency calibration device, including autocollimator A, bidirectional electronic level, autocollimator B, test bench and adjustment bracket, dual laser inertial group, aiming prism, arrow body bracket and comprehensive test electric control box , wherein the test bench and the adjustment bracket are double-layer brackets, the upper surface of the upper bracket is provided with a cast aluminum shell, and the two ends of the cast aluminum shell are respectively provided with an autocollimator A and an autocollimator B, A two-way electronic level is arranged between the autocollimator A and the autocollimator B; a comprehensive test electric control box is arranged on the lower bracket of the test bench and the adjustment bracket; A laser inertial group, the dual laser inertial groups are two laser inertial groups to be measured, and each laser inertial group is respectively provided with an aiming prism.

The cast aluminum shell is treated effectively and stabilized.

The measurement optical axes of the autocollimator A and the autocollimator B are parallel.

The beneficial effects of the present invention are:

1. The present invention uses a CCD photoelectric autocollimator to calibrate the azimuth value of the aiming prism, and the CCD photoelectric autocollimator can effectively avoid the vertical axis leveling error and manual focusing error existing when multiple theodolites are networked to measure, Alignment error, etc.

2. Because the two CCD photoelectric autocollimators sample and process the returned images at the same time with the participation of the control system, the errors caused by the inconsistency of the collimation time during manual operation are avoided. At the same time, the automatic calculation of the control system also greatly improves the work efficiency and reduces the labor intensity of the operator.

Description of drawings

1 is a schematic structural diagram of an optical axis consistency calibration device;

Fig. 2 is a schematic diagram of the optical path of the optical axis consistency calibration device structure calibration process;

FIG. 3 is a structural schematic diagram of an optical axis consistency calibration device.

Among them, 1. Autocollimator A; 2. Bidirectional electronic level; 3. Autocollimator B; 4. Test bench and adjustment bracket; 5. Dual laser inertial group; 6. Aiming prism; 7. Arrow body support 8. Comprehensive test electric box;

Detailed ways

The one proposed by the present invention is further introduced below in conjunction with the accompanying drawings and embodiments:

An optical axis consistency calibration device, characterized in that it includes an autocollimator A1, a two-way electronic level 2, an autocollimator B3, a test bench and an adjustment bracket 4, a dual laser inertial group 5, an aiming prism 6, an arrow The body bracket 7 and the comprehensive test electric control box 8, wherein the test bench and the adjustment bracket 4 are double-layer brackets, the upper surface of the upper bracket is provided with a cast aluminum shell, and the two ends of the cast aluminum shell are respectively provided with automatic A two-way electronic level 2 is arranged between the collimator A1 and the autocollimator B3, and a two-way electronic level 2 is arranged between the autocollimator A1 and the autocollimator B3; a comprehensive test is arranged on the lower bracket of the test bench and the adjustment bracket 4 The electric control box 8; the arrow body support 7 is provided with a dual laser inertial group 5, the double laser inertial group 5 is the two laser inertial groups to be measured, and each laser inertial group is respectively provided with an aiming prism 6 .

The cast aluminum shell is treated effectively and stabilized.

The measurement optical axes of the autocollimator A1 and the autocollimator B3 are parallel.

Two CCD photoelectric autocollimators were fixed on the test, and the two autocollimators were aimed at the aiming prisms of the master and slave groups respectively. The zero-position optical axes of the two autocollimators have been adjusted to be parallel at the factory, and the azimuth difference between the normals of the two aiming prisms can be calculated according to the difference between the readings after the two autocollimators are aligned with the aiming prism.

In order to avoid the influence of the prism ridge line non-level error on the orientation, the two CCD photoelectric autocollimators in the measuring device should be measured in a horizontal state as much as possible, and the two-way electronic level should be used to accurately level the calibration device and monitor and compensate in real time. .

As shown in Figure 1, the CCD photoelectric autocollimator is used to measure the azimuth value of the exit normal of the aiming prism, and has the advantages of automatic alignment, automatic acquisition, automatic reading and automatic data processing. With the participation of the control system, the collimator is cleared, collected, and read at the same time. The theodolite error and manual operation error existing in the manual operation of the theodolite are effectively avoided.

The two CCD autocollimators are installed on the cast aluminum shell. The cast aluminum shell has been treated effectively and stabilized, which can effectively ensure the minimum deformation of the substrate under high and low temperature conditions, and does not cause the two installed CCDs to self-align. Changes in the mutual position of the collimators.

After the two CCD photoelectric autocollimators are installed in the casing, the measurement optical axes of the two are adjusted to be parallel by means of precision grinding. According to the difference between the readings of the two autocollimators after aligning the aiming prisms, the consistency error of the outgoing optical axes of the two aiming prisms can be calibrated.

The installation base of the two-way electronic level is parallel to the plane where the output optical axes of the two CCD photoelectric autocollimators are located.

As shown in FIG. 3 , referring to the reading of the bidirectional electronic level, the optical axis consistency calibration device is aligned with the prism to be calibrated in a horizontal aiming state.

Before calibrating the consistency of the exit optical axis of the strapdown inertial group sighting prism, the installation error of each inertial group sighting prism relative to the inertial group coordinate axis should be calibrated first, that is, the values of α and β; where α is the prism ridge line and the inertial group coordinate The non-parallel error of the axis around the X-axis direction, β is the non-parallel error between the prism ridge and the inertial group coordinate axis around the Y-axis direction. The α and β values of the main and backup inertial prisms are α _main , β _main , α _backup , β _backup , respectively, and the angle of rotation around the X-axis is defined as the azimuth angle.

In the formal calibration process, after the two CCD photoelectric autocollimators are collimated with the aiming prism, the readings are A and B respectively, then the azimuth difference between the backup inertial group prism and the main inertial group prism is

Δ=(B-α _backup )-(A-α _main ).

Claims (2)

1. a kind of light axis consistency caliberating device, it is characterised in that: including autocollimator A (1), bidirectional electronic level meter (2), from Group (5), alignment prism (6), rocket body bracket (7) and synthesis are used in collimator B (3), testboard bay and adjustment bracket (4), double excitation It tests electric cabinet (8), wherein the testboard bay and adjustment bracket (4) are double-layer scaffold, upper layer bracket upper surface is equipped with casting Aluminum enclosure, the cast aluminum casings both ends are respectively equipped with autocollimator A (1) and autocollimator B (3), autocollimator A (1) and autocollimatic A bidirectional electronic level meter (2) is equipped between straight instrument B (3)；It is set on the testboard bay and the lower floor support of adjustment bracket (4) There is an integration test electric cabinet (8)；The rocket body bracket (7) is equipped with double excitation and is used to group (5), and the double excitation is used to group (5) Be used to group for two laser to be measured, each laser is used to be respectively equipped with an alignment prism (6) in group, the autocollimator A (1) and The measurement optical axis of autocollimator B (3) is parallel.

2. a kind of light axis consistency caliberating device as described in claim 1, it is characterised in that: the cast aluminum casings pass through actual effect Processing and stable processing.