A device and method for calibrating the night vision optical axis of a helmet display system

Abstract

A night vision optical axis calibration device and method for a helmet display system according to the present invention belong to the technical field of optical and mechanical assembly and adjustment; it includes a first small-aperture collimator, a second small-aperture collimator, a precision guide rail, and a theodolite; the axes of the two small-aperture collimators are arranged in parallel, and the theodolite is installed in front of them through the precision guide rail, and the relative position with the two small-aperture collimators is changed by sliding along the precision guide rail. The calibration method is to adjust the optical axis parallelism of the two collimators with the help of the theodolite as the calibration reference, judge the deviation degree of the night vision optical axis through the difference between the night vision image and the central reading of the display image of the helmet display system, and realize the calibration of the night vision optical axis by adjusting the shim. The present invention can reduce the requirement for the aperture of the collimator, and realize the calibration of the night vision optical axis with high precision and high stability, ensuring the accurate display of the night vision image.

Description

Technical Field

[0001] The present invention belongs to the technical field of opto-mechanical alignment, and particularly relates to a night vision optical axis calibration device and method for a helmet display system. Background Art

[0002] The helmet display system is an opto-mechanical system integrating display, aiming, and protection characteristics. The night vision system of the helmet display system can use optical enhancement technology to utilize starlight, moonlight, and airglow to perform optoelectronic conversion and image enhancement on X-rays, UV light, infrared radiation, etc. that the human eye cannot or is not easily visible, thereby improving the visibility of the helmet display system at night or in low light conditions.

[0003] The night vision image captured by the night vision system is superimposed on the display image of the helmet display system. When the deviation of the night vision optical axis is large, the night vision image deviates greatly from the actual outdoor scene image, which will affect the wearer's information acquisition and judgment. Usually, the span between the visual optical axis and the night vision optical axis of the helmet display system is large, and a large aperture of the collimator is required for optical axis calibration, and the calibration conditions are relatively high; based on the above requirements, it is difficult for the existing technology to meet the large aperture for calibration, and the cost is expensive.

[0004] In view of this situation, the present invention proposes a night vision optical axis calibration method for a helmet display system, which can simply and quickly calibrate the night vision optical axis of the helmet display system. Summary of the Invention

[0005] Technical Problems to be Solved

[0006] In order to avoid the deficiencies of the prior art, the present invention provides a night vision optical axis calibration device and method for a helmet display system, which can simply and effectively calibrate the night vision optical axis through the cooperation of two small-aperture collimators.

[0007] The technical solution of the present invention is: a night vision optical axis calibration device for a helmet display system, including a first small-aperture collimator, a second small-aperture collimator, a precision guide rail, and a theodolite; the axes of the two small-aperture collimators are arranged in parallel, and the theodolite is installed in front of them through the precision guide rail and slides along the precision guide rail to change the relative position with the two small-aperture collimators;

[0008] The theodolite establishes a night vision optical axis calibration reference by switching positions in front of the two small-aperture collimators.

[0009] A further technical solution of the present invention is: the diameter of the small-aperture collimator is 100 mm.

[0010] A further technical solution of the present invention is: the precision guide rail is a linear guide rail.

[0011] A calibration method for a calibration device of a night vision optical axis of a helmet display system, the specific steps are as follows:

[0012] Step 1: Determine the theodolite attitude;

[0013] Install the theodolite on a precision guide rail and place it in front of the first small-aperture collimator. Read the coordinates (x1, y1) of the center point of the first small-aperture collimator through the theodolite, and fix the azimuth and pitch rotation axes of the theodolite so that the attitude remains unchanged.

[0014] Step 2: Adjust the optical axes of the two collimators;

[0015] Move the theodolite in front of the second small-aperture collimator, and adjust the position of the second small-aperture collimator to ensure that the crosshair of the theodolite coincides with the center point of the second small-aperture collimator, and the reading is (x1, y1); at this time, it can be ensured that the optical axes of the first small-aperture collimator and the second small-aperture collimator are consistent, which is used as the reference for optical axis calibration.

[0016] Step 3: Determine the deviation of the night vision optical axis;

[0017] The operator wears the helmet display system and sits in front of the small-aperture collimator. Install the night vision system on the helmet display system, and connect the helmet display system to the detector. When powered on, observe the display screen of the first small-aperture collimator through the helmet display system, and make the center of the display screen in the helmet display system coincide with the center of the display screen of the first small-aperture collimator; at the same time, the night vision system collects the image of the second small-aperture collimator and superimposes it on the display screen of the helmet display system. The deviation (△x, △y) of the center of the second small-aperture collimator relative to the center of the first small-aperture collimator is the deviation of the night vision optical axis.

[0018] Step 4: Adjust the deviation of the night vision optical axis.

[0019] A further technical solution of the present invention is that in the step 2, by rotating the precision guide rail 3, the theodolite 4 is driven to move.

[0020] A further technical solution of the present invention is that the distance from the center of the helmet display system to the center of the night vision system is 300 mm, and the distance between the two small-aperture collimators is the same as the distance between the two centers.

[0021] A further technical solution of the present invention is that in the step 4, the deviation △x of the night vision optical axis is the azimuth deviation, and the adjustment method is to change the thickness of the adjustment shim at the installation surface of the night vision system.

[0022] A further technical solution of the present invention is that in the step 4, the deviation △y of the night vision optical axis is the pitch deviation, and the adjustment method is to rotate the installation position of the night vision system.

[0023] Beneficial effects

[0024] The beneficial effects of the present invention are as follows: For the method of adjusting the night vision optical axis of the helmet display system of the present invention, a set of two small-aperture collimators is adopted. With the help of a theodolite, the parallelism of the optical axes of the two collimators is adjusted as the calibration reference. By the difference between the night vision image and the central reading of the display image of the helmet display system, the deviation degree of the night vision optical axis is judged, and the adjustment of the night vision optical axis is realized by adjusting the shim. It can reduce the requirement for the aperture of the collimator, and realize the adjustment of the night vision optical axis with high precision and high stability, ensuring the accurate display of the night vision image.

[0025] 1. By building a set of two small-aperture collimator systems, the present invention can ensure the adjustment of the night vision optical axis of the helmet display system with a large optical axis span.

[0026] 2. The device of the present invention has a simple structure, and the installation and adjustment method is simple, fast and universal; it is easier to realize the adjustment of the night vision optical axis, making the deviation of the central position less than 30″. Description of the drawings

[0027] Figure 1 It is a schematic diagram of the overall composition of the night vision optical axis adjustment system of the helmet display system of the present invention;

[0028] Figure 2 It is a schematic diagram of the connection of the helmet display system in the device of the present invention;

[0029] Figure 3 It is a schematic diagram of the optical axis deviation of the night vision system in the device of the present invention;

[0030] Description of the reference numerals in the drawings: 1. The first small-aperture collimator, 2. The second small-aperture collimator, 3. The precision guide rail, 4. The theodolite, 5. The helmet display system, 6. The night vision system. Specific embodiments

[0031] The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0033] Refer to Figure 1 As shown, a night vision optical axis calibration device for a helmet display system in this embodiment includes a first small-aperture collimator 1, a second small-aperture collimator 2, a precision guide rail 3, and a theodolite 4, which are composed of four parts. The axial directions of the two small-aperture collimators are arranged in parallel. The theodolite 4 is installed in front of them through the precision guide rail 3 and slides along the precision guide rail 3 to change its relative position with the two small-aperture collimators.

[0034] Refer to Figure 2 、 3 As shown, in the calibration method of the night vision optical axis of a helmet display system in this embodiment, the precondition for calibrating the night vision optical axis of the helmet display system is that the benchmarks between the two are consistent. The method takes the following steps:

[0035] 1) Theodolite 4 attitude determination

[0036] Install the theodolite 4 on the precision guide rail 3 and place it in front of the first small-aperture collimator. Read the coordinates (x1, y1) of the center point of the first small-aperture collimator through the theodolite 4, and fix the azimuth and pitch rotation axes of the theodolite 4 so that the attitude remains unchanged.

[0037] 2) Dual-collimator optical axis adjustment

[0038] Rotate the precision guide rail 3 to drive the theodolite 4 to move in front of the second small-aperture collimator. Adjust the position of the second small-aperture collimator to ensure that the crosshair of the theodolite 4 coincides with the center point of the second small-aperture collimator and the reading is (x1, y1). At this time, it can be ensured that the optical axes of the first small-aperture collimator and the second small-aperture collimator are consistent, which serves as the benchmark for optical axis calibration.

[0039] 3) Night vision optical axis deviation determination

[0040] The operator wears the helmet display system 5 and sits in front of the small-aperture collimator. Install the night vision system 6 on the helmet display system 5, and connect the helmet display system 5 to the detector. When powered on, observe the display screen of the first small-aperture collimator 1 through the helmet display system 5, and make the center of the display screen in the helmet display system 5 coincide with the center of the display screen of the first small-aperture collimator 1. At the same time, the night vision system 6 collects the image of the second small-aperture collimator 2 and superimposes it on the display screen of the helmet display system 5 worn on the head. The deviation (△x, △y) of the center of the second small-aperture collimator 2 relative to the center of the first small-aperture collimator 1 is the deviation of the night vision optical axis 5.

[0041] Among them, the distance between the center of the helmet display system 5 and the center of the night vision system 6 is 300 mm, and the distance between the two small-aperture collimators is the same as the distance between the two centers.

[0042] 4) Night vision optical axis deviation adjustment

[0043] The deviation △x is the azimuth deviation, and the adjustment method is to change the thickness of the adjustment shim at the installation surface of the night vision system 6; the deviation △y is the pitch deviation, and the adjustment method is to rotate the installation position of the night vision system.

[0044] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A calibration method for a calibration device of a night vision optical axis of a helmet display system, characterized in that: The night vision optical axis calibration device of the helmet display system includes a first small-aperture collimator, a second small-aperture collimator, a precision guide rail, and a theodolite; the axes of the two small-aperture collimators are arranged in parallel, and the theodolite is installed in front of them through the precision guide rail, and slides along the precision guide rail to change its relative position with the two small-aperture collimators; the theodolite establishes a night vision optical axis calibration reference by switching positions in front of the two small-aperture collimators. The specific steps of the calibration method are as follows: Step 1: Determine the attitude of the theodolite; Install the theodolite on the precision guide rail and place it in front of the first small-aperture collimator. Read the coordinates (x1, y1) of the center point of the first small-aperture collimator through the theodolite, and fix the azimuth and pitch rotation axes of the theodolite to keep the attitude unchanged. Step 2: Adjust the optical axes of the two collimators; Move the theodolite in front of the second small-aperture collimator, and adjust the position of the second small-aperture collimator to ensure that the crosshair of the theodolite coincides with the center point of the second small-aperture collimator, and the reading is (x1, y1); at this time, it can be ensured that the optical axes of the first small-aperture collimator and the second small-aperture collimator are consistent, serving as the reference for optical axis calibration. Step 3: Determine the deviation of the night vision optical axis; The operator wears the helmet display system and sits in front of the small-aperture collimator. Install the night vision system on the helmet display system, and connect the helmet display system to the detector. When powered on, observe the display screen of the first small-aperture collimator through the helmet display system, and make the center of the display screen in the helmet display system coincide with the center of the display screen of the first small-aperture collimator; at the same time, the night vision system collects the image of the second small-aperture collimator and superimposes it on the display screen of the helmet display system. The deviation (△x, △y) of the center of the second small-aperture collimator relative to the center of the first small-aperture collimator is the deviation of the night vision optical axis. Step 4: Adjust the deviation of the night vision optical axis.

2. The calibration method of the night vision optical axis calibration device of a helmet display system according to claim 1, characterized in that: The diameter of the small-aperture collimator is 100 mm.

3. The calibration method of the night vision optical axis calibration device for a helmet display system according to claim 1, characterized in that: The precision guide rail is a linear guide rail.

4. The calibration method of a calibration device for a night vision optical axis of a helmet display system according to claim 1, characterized in that: In Step 2, rotate the precision guide rail (3) to drive the theodolite (4) to move.

5. The calibration method of a night vision optical axis calibration device for a helmet display system according to claim 1, characterized in that: In Step 3, the distance from the center of the helmet display system to the center of the night vision system is 300 mm, and the distance between the two small-aperture collimators is the same as the distance between the two centers.

6. The calibration method of a calibration device for a night vision optical axis of a helmet display system according to any one of claims 1-5, characterized in that: In Step 4, the deviation △x of the night vision optical axis is the azimuth deviation, and the adjustment method is to change the thickness of the adjustment shim at the installation surface of the night vision system.

7. A calibration method for a calibration device of a night vision optical axis of a helmet display system according to any one of claims 1-5, characterized in that: In Step 4, the deviation △y of the night vision optical axis is the pitch deviation, and the adjustment method is to rotate the installation position of the night vision system.

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