A Simple Real-time Monitoring Method for the Assembly Quality of Large Aperture Spherical Reflectors

Abstract

The present invention discloses a simple real-time monitoring method for the assembly quality of a large-aperture spherical mirror, and its steps include: 1) Align the image acquisition unit with the installation area of the large-aperture spherical mirror and fix it; the installation area of the large-aperture spherical mirror is the area for assembling each mirror that constitutes the large-aperture spherical mirror; 2) Place one or more reference objects in front of the installation area of the large-aperture spherical mirror, and use the image acquisition unit to collect the images of the reference objects in each mirror to be spliced; 3) Detect whether the images of the reference objects in adjacent mirrors to be spliced are continuous. If they are continuous, it is determined that the corresponding two mirrors to be spliced meet the assembly requirements; otherwise, adjust the posture of the corresponding mirror to be spliced.

Description

Technical Field

[0001] The present invention belongs to the field of assembling large-aperture spherical mirrors, and particularly relates to a simple method for real-time monitoring of the assembling quality of large-aperture spherical mirrors. Background Art

[0002] In recent years, the research and development and application of large-aperture observation equipment in China have developed rapidly, and the use of large-aperture reflectors is involved in the observation equipment. In order to reduce the difficulty of mirror surface processing and improve the resolution, the large-aperture reflectors of the observation equipment adopt segmented reflectors. This introduces new problems. The segmented reflectors need to be assembled into a large-aperture reflector. For example, traditional Ronchi testing, wire testing, and interferometric measurement methods, etc. After assembly, during long-term use, the assembly quality will change, so long-term monitoring means are required to correct the experimental data subsequently. At the same time, evaluate the assembly quality to provide a basis for subsequent maintenance. After the large-aperture spherical mirror is installed, the traditional installation means cannot achieve real-time monitoring of the assembly quality and cannot provide a basis for maintenance. Summary of the Invention

[0003] In order to solve the above problems, the present invention proposes a simple method for real-time monitoring of the assembling quality of large-aperture spherical mirrors. This method can not only assist in the installation of spherical mirrors, but also monitor the assembly quality for a long time after installation, and independently complete the replacement of the mirror. The principle of this method is simple, the tools used are simple, convenient to operate and expand, and the accuracy is relatively high.

[0004] A simple method for real-time monitoring of the assembling quality of large-aperture spherical mirrors is as follows:

[0005] 1. Align the camera with the installation area of the large-aperture spherical mirror and fix it, and then connect it to a computer for real-time image acquisition. There are at least two or more reflectors to be spliced in the installation area.

[0006] 2. Place one or more continuous reference objects in front of the installation area of the large-aperture spherical mirror so that the camera can capture the images of the continuous reference objects in each reflector to be spliced.

[0007] 3. If the images of the continuous reference objects captured by the camera in two adjacent reflectors are not continuous, the reflectors need to be adjusted to make the images continuous. To determine whether the images are continuous, photos or videos can be taken, and after obtaining the image data, it can be processed on the computer. After opening the picture, the imaging details can be viewed through local enlarged pictures to achieve pixel-level alignment; or the imaging features can be automatically recognized through the written software, including the lines and shapes of the reference objects, and the features can be recognized through grayscale images. Based on the distance of the features in the picture, the difference in imaging is given, and when the difference is less than one pixel, the target is achieved.

[0008] 4. If the images in adjacent reflectors captured by the camera are continuous, it indicates that the assembly effect of adjacent two reflectors is good.

[0009] 5. By long-term capturing the images of the reference object in the spherical mirror by the camera, the monitoring of the assembly quality of the spherical mirror can be completed.

[0010] 6. When the large-aperture mirror is used for a long time and it is found through detection that the images in the mirror are no longer continuous and need to be adjusted or even replaced, calibration can be performed through the images of the objects captured by the camera.

[0011] The advantages of the present invention are as follows:

[0012] The applicant proposes a simple real-time monitoring method for the assembly quality of a large-aperture spherical mirror. Through the images obtained only by the reference object and the camera, the assembly adjustment and calibration of the spherical mirror can be realized, which is convenient, fast and has high precision. After the assembly of the spherical mirror is completed, the assembly quality can also be monitored for a long time through this method without additional equipment, and the method is simple and easy to implement. Brief Description of the Drawings

[0013] Figure 1 It is a setting diagram of a simple real-time monitoring method for the assembly quality of a large-aperture spherical mirror of the present invention.

[0014] Among them, 1 - the first reflector, 2 - the reference object, 3 - the camera, 4 - the image processing unit (computer), 5 - the second reflector. Detailed Embodiment

[0015] The present invention will be further described in detail below with reference to the drawings. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0016] As Figure 1 shown is a simple real-time monitoring method for the assembly quality of a large-aperture spherical mirror. The dotted lines in the mirror are the images of the continuous reference objects. The first reflector 1 and the second reflector 5 are both fixed on the corresponding adjustable brackets. The reference object 2 is fixed in front of the large-aperture mirror, and the camera 3 is fixed in front of the mirror, facing the splicing area of the mirror, and can capture the images of the reference object in the spliced mirror. The camera 3 is connected to the computer 4 and can save data in real time.

[0017] The specific monitoring method is as follows:

[0018] S1 Align the camera with the installation area of the large-aperture spherical mirror, and then connect to the computer for real-time image acquisition.

[0019] S2 Place several continuous reference objects in front of the installation area of the large-aperture spherical mirror so that the camera can capture the images in the mirror.

[0020] If the images in adjacent mirrors captured by the S3 camera are not continuous, the mirrors need to be adjusted to make the images continuous.

[0021] If the images in adjacent mirrors captured by the S4 camera are continuous, it indicates that the assembly effect of two adjacent mirrors is good.

[0022] S5 can complete the monitoring of the assembly quality of the spherical mirror by long-term shooting of the imaging of the reference object in the spherical mirror by the camera.

[0023] If, after long-term use of the large-aperture mirror, it is detected that the images in the mirror are no longer continuous and need to be adjusted or even replaced, calibration can be performed through the images of the objects captured by the camera.

[0024] The specific operation method is as follows:

[0025] In S1, the camera 3 is aimed at the installation area of the large-aperture spherical mirror. The field of view of the camera here needs to be able to completely cover the installation area of the mirror. If a single camera cannot cover all of it, multiple cameras can be used, and the data of multiple cameras are used for calibration simultaneously during adjustment. After the camera is installed, it needs to be fixed well, and the subsequent camera should not be moved as much as possible. Then each camera is connected to the computer 4, and the computer performs real-time image acquisition.

[0026] In S2, one or more continuous reference objects 2 are placed in front of the installation area of the large-aperture spherical mirror. Do not move the reference objects after installation. The installation position of the reference objects should not be too close to the mirror. The farther the installation position is from the mirror, the higher the adjustment and monitoring accuracy. The installation position of the reference objects needs to enable the camera to capture the imaging of the reference objects in the first mirror 1 and the second mirror 5.

[0027] In S3, if the images in adjacent mirrors captured by the camera 3 are not continuous, it means that the adjacent first mirror 1 and second mirror 5 are not assembled well, and one of the mirrors needs to be adjusted to make the imaging of the reference object continuous in the two spliced mirrors. This operation can play a role in assisting the adjustment of the mirror.

[0028] In S4, if the images in the adjacent first mirror 1 and second mirror 5 captured by the camera 3 are continuous, it means that the assembly effect of the two adjacent mirrors is good and no further adjustment is required.

[0029] In S5, the imaging of the reference object in the spherical mirror is continuously captured by the camera 3 for a long time, and the screenshots are continuously recorded or saved. By observing the position change of the reference object in the video or picture, the assembly quality of the mirror can be continuously detected for a long time. When the image of the reference object in the mirror is no longer continuous, the mirror can be calibrated and adjusted by the object image captured by the camera. If the mirror is damaged and needs to be replaced, the above method is also required for calibration.

[0030] Although specific embodiments of the present invention are disclosed for illustrative purposes, which are intended to help understand the content of the present invention and implement it accordingly, those skilled in the art can understand that: without departing from the spirit and scope of the present invention and the appended claims, various substitutions, changes and modifications are possible. Therefore, the present invention should not be limited to the content disclosed in the best embodiments, and the scope of protection claimed by the present invention shall be subject to the scope defined by the claims.

Claims

1. A real-time monitoring method for the assembly quality of a large-aperture spherical mirror, the steps of which include: 1) Align the image acquisition unit with the installation area of the large-aperture spherical mirror and fix it; the installation area of the large-aperture spherical mirror is the area where each mirror constituting the large-aperture spherical mirror is assembled; 2) Place one or more reference objects in front of the installation area of the large-aperture spherical mirror, and use the image acquisition unit to collect the images of the reference objects in each mirror to be spliced; 3) Detect whether the images of the reference object in adjacent mirrors to be spliced are continuous. If they are continuous, it is determined that the corresponding two mirrors to be spliced meet the assembly requirements; otherwise, adjust the postures of the corresponding mirrors to be spliced.

2. The method according to claim 1, characterized in that Transmit the images of the reference object in each mirror to be spliced to the data processing unit. The data processing unit performs pixel-level alignment detection on the images in adjacent mirrors to be spliced. If the alignment standard is met, it is determined that the corresponding two mirrors to be spliced meet the assembly requirements.

3. The method according to claim 1, characterized in that, Transmit the images of the reference object in each mirror to be spliced to the data processing unit. The data processing unit identifies the image features of the images in adjacent mirrors to be spliced and calculates the difference between the two image features. If the difference meets the set conditions, it is determined that the corresponding two mirrors to be spliced meet the assembly requirements.

4. The method according to claim 3, wherein The imaging features include the lines and shapes of the reference object.

5. The method according to claim 1 or 2 or 3, characterized in that, The reference object is a continuous reference object.

6. The method according to claim 1 or 2 or 3, characterized in that, The image acquisition unit is one or more cameras.

7. The method according to claim 1 or 2 or 3, characterized in that Use the image acquisition unit to regularly collect the images of the reference object in the spliced large-aperture spherical mirror. If the images of the reference object in two adjacent mirrors of the large-aperture spherical mirror are not continuous, adjust the postures of at least one of the two adjacent mirrors.

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