Target component assembling and calibrating method of target simulator

Abstract

The invention discloses a method for assembling and calibrating a target assembly of a target simulator. The target assembly of the target simulator comprises a target frame and a target installed on the target frame. The target disc assembly comprises a target disc and 12 target assemblies mounted on the target disc, and the 12 target assemblies are uniformly distributed on the target disc in the circumferential direction; when the target assemblies are installed and calibrated, the target assemblies are installed on a lathe through a threaded connection tool, the installation faces of the target assemblies are trimmed through the lathe, the value of the height difference between each target face and the installation face of the target assemblies is a fixed value, and after all the target assemblies are installed on a target disc, the target assemblies are trimmed and calibrated. The position of the target surface of each target assembly on the target disc is consistent with the distance between the collimators, and then the focusing work of the whole target simulator is completed at a time by adjusting the position of the whole target disc. According to the invention, the focusing difficulty of the product is greatly reduced, the target assembly has interchangeability, the focusing efficiency of the system is improved, and the maintenance cost of replacing and upgrading the target is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of optical precision assembly and calibration, and relates to a target component assembly and calibration method of a target simulator. Background Art

[0002] The target simulator can image a close-range target to infinity to simulate a target at infinity, providing a target source for imaging system adjustment and testing. As one of the key adjustment and testing equipment for imaging infrared imaging systems, the target simulator is suitable for static and dynamic performance testing and semi-physical simulation tests, providing a target source for system adjustment and testing.

[0003] The target simulator is usually composed of key components such as a collimator, a target, and an infrared emission source (black body). The target is installed at the focal plane of the collimator. The energy emitted by the emission source passes through the target and enters the collimator, thereby forming a parallel light beam with target information. The installation and debugging of the target component is a key link in the production of the target simulator, and its installation accuracy directly affects the final accuracy of the target simulator and the accuracy of the adjustment test. At the same time, in order to meet the needs of multi-purpose testing, the target simulator needs to match targets of multiple specifications, and then integrate and switch different targets through structural parts (target disks). Therefore, the installation and calibration of the target component has always been an important guarantee for the accuracy of the target simulator, and it also restricts production efficiency. The traditional debugging method is affected by the size difference between different targets. Each target must be focused separately by adding or subtracting shims to place each target at the focal plane of the collimator, thereby ensuring that the light tube can simulate infinite parallel light. This method has the disadvantages of low debugging efficiency, poor consistency of target components, and lack of interchangeability between components. Summary of the invention

[0004] (I) Purpose of the invention

[0005] The purpose of the present invention is to propose a method for calibrating a target component of a target simulator, so as to solve the problems of low efficiency, large measurement error and poor consistency of target component calibration, and to achieve simple operation, high efficiency and good consistency of target component processing. The target components using the calibration method are interchangeable, which is more conducive to engineering applications.

[0006] (II) Technical solution

[0007] In order to solve the above technical problems, the present invention provides a target assembly calibration method for a target simulator, wherein the target assembly of the target simulator comprises a target frame and a target mounted thereon; the target disk assembly comprises a target disk and 12 target assemblies mounted thereon, and the 12 target assemblies are evenly distributed circumferentially on the target disk; when the target assembly is calibrated, the target assembly is mounted on a lathe through a threaded connection tooling, and the mounting surface of the target assembly is trimmed by the lathe so that the height difference between each target surface and the mounting surface of its assembly is a fixed value, and after each target assembly is mounted on the target disk, the position of the target surface of each target assembly on the target disk is kept consistent with the distance between the parallel light tubes, and then the focusing work of the entire target simulator is completed at one time by adjusting the position of the entire target disk.

[0008] When calibrating the target assembly, observe the position of the target hole on the target plate through the photoelectric collimation imaging system, adjust the distance between the photoelectric collimation imaging system and the target, and when the image is clear, the distance between the photoelectric collimation imaging system and the target surface is L1; use the machine tool grating ruler and micrometer to measure the relative distance between the photoelectric collimation imaging system and the target assembly installation positioning surface as L2, and then use the lathe to trim the target assembly installation surface. The height difference between the target surface and the target assembly installation surface is L, where L1 is the characteristic parameter of the photoelectric collimation imaging system and is a system invariant, L = L2-L1, set L to a fixed value, and realize each target assembly by turning the installation surface of the target assembly. The height L of the components is consistent; a full set of target components with consistent target surface height difference L is obtained, and each target component is installed on the target plate. The target plate makes the relative distance between the target surface of each target component and the collimator consistent. The target plate position is adjusted once, that is, the target plate is adjusted to the focal plane position of the collimator, the target plate is rotated to place the 12 target components in sequence at the focal plane of the collimator, the target plate assembly is focused, the standard imaging optical lens is aligned with the collimator for imaging, and the collected image is displayed on the computer through image acquisition. When a clear target image appears, it is determined that the target is located at the focal plane, the technical requirements are met, and the focus of the target plate is completed.

[0009] (III) Beneficial effects

[0010] The target component assembly and calibration method of the target simulator provided by the above technical solution realizes the online measurement and turning of the components in a single clamping, which improves the processing consistency of the 12 target components by 10 times (from the original ±0.1mm to ±0.01mm); since it is a non-contact measurement, it first solves the problem of scratching the target functional area; secondly, due to the improvement of the processing consistency of the 12 target components, the difficulty of product focusing is greatly reduced, the target components are interchangeable, the system focusing efficiency is improved, and the maintenance cost of replacing and upgrading the targets is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1is the target component diagram;

[0012] Figure 2 This is a target plate assembly diagram;

[0013] Figure 3 The target assembly is connected to the lathe fixture through a threaded connection fixture;

[0014] Figure 4 A schematic diagram of the test layout for target component processing;

[0015] Figure 5 This is a schematic diagram of the focus adjustment of the target simulator;

[0016] Figure 6 Schematic diagram of target component measurement and processing. DETAILED DESCRIPTION

[0017] In order to make the purpose, content and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below in conjunction with the drawings and examples.

[0018] Reference Figure 1 As shown, the target assembly of the target simulator includes a target frame and a target mounted thereon.

[0019] Reference Figure 2 As shown, the target disk assembly includes a target disk 13 and 12 target assemblies mounted thereon, and the 12 target assemblies are evenly distributed circumferentially on the target disk 13 .

[0020] When calibrating the target component of the target simulator, the calibration device used includes: a lathe, a lathe chuck, a threaded connection tooling, a target component, and a photoelectric collimation system arranged from left to right. The target component is installed on the lathe through the threaded connection tooling, and the photoelectric collimation imaging system, the machine tool grating scale, and the micrometer combination are used for measurement. The mounting surface of the target component is trimmed by the lathe so that the height difference between each target surface and the mounting surface of its component is a fixed value. In this way, after each target component is installed on the target disk, the position of the target surface of each target component on the target disk is consistent with the distance between the parallel light tubes. By adjusting the position of the entire target disk, the focusing work of the entire target simulator can be completed at one time.

[0021] The target assembly calibration method of the target simulator is implemented as follows: the target assembly ( Figure 1 ) is installed on the lathe through threaded connection tooling ( Figure 3 ), complete the target component processing and test layout, such as Figure 4 As shown in Figure 2, the target opening position is observed through the photoelectric collimation imaging system, as shown in Figure 2. Figure 6As shown, adjust the distance between the photoelectric collimation imaging system and the target so that a clear and sharp image can be seen. At this time, the distance between the photoelectric collimation imaging system and the target surface is L1; use the machine tool grating ruler and micrometer to measure the relative distance between the photoelectric collimation imaging system and the target component installation positioning surface as L2, and then use a lathe to trim the target component installation surface. The height difference between the target surface and the target component installation surface is L, where L1 is the characteristic parameter of the photoelectric collimation imaging system and is a system invariant. This method can effectively avoid contact measurement and solve the problem of inaccurate measurement of target deformation caused by contact measurement (the target functional area is a thin-walled part with a thickness of only 0.2mm). Figure 6 Knowing that L = L2-L1, L is set to a fixed value. By simply turning the mounting surface of the target component, the height of L of each target component can be made consistent, that is, L 1 =L 2 =L 3 =L 4 =…L 12 , the matching dimensions of each component can be made the same and interchangeable.

[0022] A full set of target components with consistent target surface height difference L (consistency ±0.01mm) are obtained, and each target component is installed on the target plate, such as Figure 2 As shown in the figure, the target plate makes the relative distance between the target surface of each target component and the parallel light tube consistent, and the position of the target plate is adjusted once, such as Figure 5 As shown, the target plate is adjusted to the focal plane position of the collimator, and the 12 target components can be placed in sequence at the focal plane of the collimator by rotating the target plate. The target plate components are focused, and the standard imaging optical lens is aligned with the collimator for imaging, and the collected image is displayed on the computer through image acquisition. When a clear and sharp target image appears, it can be determined that the target is at the focal plane, meeting the technical requirements, and the target plate focusing is completed.

[0023] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for calibrating a target component of a target simulator, characterized in that: The target assembly of the target simulator includes a target frame and a target mounted thereon; the target disk assembly includes a target disk and 12 target assemblies mounted thereon, and the 12 target assemblies are evenly distributed circumferentially on the target disk; when the target assembly is assembled and calibrated, the target assembly is installed on a lathe through a threaded connection tooling, and the mounting surface of the target assembly is trimmed by the lathe so that the height difference between each target surface and the mounting surface of its assembly is a fixed value. After each target assembly is installed on the target disk, the position of the target surface of each target assembly on the target disk is consistent with the distance between the parallel light tubes, and then by adjusting the position of the entire target disk, the focusing work of the entire target simulator is completed at one time.

2. The target assembly calibration method of the target simulator according to claim 1, characterized in that: When calibrating the target assembly, observe the position of the target hole on the target plate through the photoelectric collimation imaging system, adjust the distance between the photoelectric collimation imaging system and the target, and when the image is clear, the distance between the photoelectric collimation imaging system and the target surface is L1; use the machine tool grating ruler and micrometer to measure the relative distance between the photoelectric collimation imaging system and the target assembly installation positioning surface as L2, and then use the lathe to trim the target assembly installation surface. The height difference between the target surface and the target assembly installation surface is L, where L1 is the characteristic parameter of the photoelectric collimation imaging system and is a system invariant, L = L2-L1, set L to a fixed value, and achieve the consistency of L height of each target assembly by turning the installation surface of the target assembly; A full set of target assemblies with uniform target surface height difference L is obtained, and each target assembly is installed on a target plate. The target plate makes the relative distance between the target surface of each target assembly and the collimator consistent. The position of the target plate is adjusted once, that is, the target plate is adjusted to the focal plane position of the collimator. The target plate is rotated to place the 12 target assemblies in sequence at the focal plane of the collimator, the target plate assembly is focused, and the standard imaging optical lens is aligned with the collimator for imaging. The collected image is displayed on a computer through image acquisition. When a clear target image appears, it is determined that the target is located at the focal plane, the technical requirements are met, and the focusing of the target plate is completed.

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