Tool and method for detecting coaxiality of mechanical shaft and optical shaft of optical machine equipment

Abstract

The invention relates to the technical field of optical-mechanical-electrical integration, in particular to a tool and method for detecting the coaxiality of a mechanical axis and an optical axis of optical-mechanical equipment, the operation process is simple and clear, professional skills or complex operation is not needed, and the working efficiency and the use experience are improved. According to the invention, the precision can be controlled by the focal length of the long-focus camera, high-precision coaxiality measurement is realized through the precise measuring device and the positioning device, and the performance and the stability of equipment are ensured. A user can adjust parameters and functions of the equipment according to specific requirements. And cameras with different focal lengths and light sources with different wavelengths can be selected to be combined according to actual requirements so as to meet the requirements of different application scenes. Compared with the traditional countershaft equipment, the design of the replaceable module greatly reduces the maintenance cost of the invention, thereby solving the problems of complex operation, high maintenance cost and low precision of the existing detection method.

Description

Technical Field

[0001] The present invention relates to the technical field of optomechanical-electrical integration, and in particular to a tool and method for detecting the coaxiality of a mechanical axis and an optical axis of an optomechanical device. Background Art

[0002] In the field of optomechanical integration, the coaxiality between the mechanical axis and the optical axis of the optomechanical device has an important impact on the performance of the device. Coaxiality refers to the relative position relationship between the mechanical axis and the optical axis. If the coaxiality is not good, it will affect the performance and accuracy of the device. Therefore, a tooling that can accurately detect the coaxiality between the mechanical axis and the optical axis of the optomechanical device is needed to ensure the performance and quality of the equipment.

[0003] Existing detection methods usually have problems such as complex operation, high maintenance cost and low precision, which are difficult to meet actual needs. For example, traditional detection methods require the use of multiple tools and equipment, which are cumbersome to operate, and the test results are easily affected by human factors and have low precision. The complexity of the equipment may also lead to difficulties in operation and maintenance, requiring professional technicians to operate and maintain. Therefore, a detection tool with simple structure, convenient operation and high precision is needed to meet actual needs. Summary of the invention

[0004] The purpose of the present invention is to provide a tool and method for detecting the coaxiality of a mechanical axis and an optical axis of an optomechanical device, aiming to solve the problems of complex operation, high maintenance cost and low precision of existing detection methods.

[0005] To achieve the above-mentioned purpose, the first invention provides a tool for detecting the coaxiality between the mechanical axis and the optical axis of an optical-mechanical device, comprising two adjustment platforms, a plane mirror, a corner cube prism, a detection optical path and a computer system;

[0006] The plane mirror is installed in front of the optical machine to be measured, the corner cube prism is installed between the two adjustment platforms, the detection light path is installed on the adjustment platform, and the computer system is connected to the detection light path through a network cable or a USB.

[0007] Wherein, the adjustment platform is composed of an xyz three-axis translation platform and a pitch azimuth angle adjuster.

[0008] The corner cube prism is used to return the incident light beam at the original angle, the incident light beam is parallel to the outgoing optical fiber and in the opposite direction, and is used to calibrate the initial center coordinates.

[0009] The detection optical path includes a 633nm laser, two beam splitting prisms, a telephoto camera and a short focal length camera, which are used to detect the coaxiality of the optical axis.

[0010] In a second aspect, a method for detecting the coaxiality between a mechanical axis and an optical axis of an optomechanical device is used in the tooling for detecting the coaxiality between a mechanical axis and an optical axis of an optomechanical device as described in the first aspect, comprising the following steps:

[0011] Select the camera focal length for detection;

[0012] Place the corner cube and record its coordinates;

[0013] Use a plane mirror to replace the corner cube;

[0014] Align the inspection fixture with the light meter and adjust the displacement and angle;

[0015] Rotate the light exit hole and observe;

[0016] Calculate new coordinates and radius;

[0017] Adjust the angle to move the light spot, repeatedly rotate the light exit hole and perform observation and calculation until the coordinates are stable and no longer change.

[0018] The present invention discloses a tool for detecting the coaxiality between the mechanical axis and the optical axis of an optical machine, comprising two adjustment platforms, a plane mirror, a corner cube prism, a detection optical path and a computer system; the plane mirror is installed in front of the optical machine to be measured, the corner cube prism is installed between the two adjustment platforms, the detection optical path is installed on the adjustment platform, and the computer system is connected to the detection optical path through a network cable or a USB. The corner cube prism is placed between the optical machine to be measured and the detection optical path 6, and the coordinates of the light spot on the short-focus and long-focus cameras are recorded after the parallel light beam emitted by the collimating lens passes through the prism and returns. The corner cube prism is removed, and the plane mirror is pasted on the light outlet of the optical machine to be measured. The detection tool is aligned with the optical machine to be measured, and the light spot appears in the camera field of view by adjusting the displacement and angle, and is fine-tuned to the recorded coordinate position. The optical machine light outlet is rotated for at least two times, and the circular motion and jitter of the light spot are observed. The data collected by the long-focus camera are fitted into a circle and the center of the circle is solved. The new coordinates are obtained by calculation, and the radius of the circle is counted by 3σ. Adjust the angle to move the light spot to the new coordinates, and repeat the above steps until the coordinates are stable. At this time, 3σ is the coaxiality. Select the appropriate camera focal length as needed to meet the accuracy requirements. Usually, the light spot is found with a short-focus camera first, and then detected with a telephoto camera. The operation process of the present invention is simple and clear, does not require professional skills or complicated operations, and improves work efficiency and user experience. The accuracy of the present invention can be controlled by the focal length of the telephoto camera. Through precise measuring devices and positioning devices, high-precision coaxiality measurement is achieved, ensuring the performance and stability of the equipment. Users can adjust the parameters and functions of the equipment according to specific needs. For example, cameras with different focal lengths and light sources of different wavelengths can be selected according to actual needs to meet the needs of different application scenarios. Compared with traditional axis alignment equipment, the design of replaceable modules also greatly reduces the maintenance cost of the present invention, thereby solving the problems of complex operation, high maintenance cost and low accuracy of existing detection methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of a tooling provided by the present invention for detecting the coaxiality of a mechanical axis and an optical axis of an optomechanical device.

[0021] Figure 2 It is a schematic diagram of the detection light path.

[0022] Figure 3It is a flow chart of a method for detecting the coaxiality between a mechanical axis and an optical axis of an optomechanical device provided by the present invention.

[0023] Figure 4 It is a schematic diagram of the detection process.

[0024] In the figure: 1-adjustment platform, 2-plane mirror, 3-corner cone prism, 4-detection optical path, 5-computer system, 6-optical machine to be measured, 41-beam splitter prism, 42-633nm laser, 43-telephoto camera, 44-short-focus camera. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0026] See also Figure 1 to Figure 2 , the first invention, the present invention provides a tool for detecting the coaxiality between the mechanical axis and the optical axis of an optical-mechanical device, comprising two adjustment platforms 1, a plane mirror 2, a corner cube prism 3, a detection optical path 4 and a computer system 5;

[0027] The plane mirror 2 is installed in front of the optical machine to be measured 6, the corner cube prism 3 is installed between the two adjustment platforms 1, the detection optical path 4 is installed on the adjustment platform 1, and the computer system 5 is connected to the detection optical path 4 through a network cable or USB.

[0028] The adjustment platform 1 is composed of an xyz three-axis translation platform and a pitch azimuth angle adjuster.

[0029] The corner cube prism 3 is used to return the incident light beam at the original angle, the incident light beam is parallel to the outgoing optical fiber and in the opposite direction, and is used to calibrate the initial circle center coordinates.

[0030] The detection optical path 4 comprises a 633 nm laser 42 , two beam splitting prisms 41 , a telephoto camera 43 and a short focal length camera, and is used to detect the coaxiality of the optical axis.

[0031] In this embodiment, the corner cube prism 3 is placed between the optical machine to be measured and the detection optical path 6, and the coordinates of the light spot on the short-focus camera 44 and the long-focus camera 43 are recorded after the parallel light beam emitted by the collimating lens passes through the prism and returns. Remove the corner cube prism 3 and stick the plane mirror 2 to the light outlet of the optical machine to be measured. Align the detection tooling with the optical machine to be measured, adjust the displacement and angle, make the light spot appear in the camera field of view, and fine-tune it to the recorded coordinate position. Let the optical machine light outlet rotate for at least two weeks, observe the circular motion and jitter of the light spot, and use the long-focus camera 43 to collect data to fit a circle and solve the center of the circle. The new coordinates are obtained by calculation, and the radius of the circle is calculated using 3σ. Adjust the angle to move the light spot to the new coordinates, repeat the above steps until the coordinates are stable, and 3σ is the coaxiality at this time. Select the appropriate camera focal length as needed to meet the accuracy requirements. Usually, the short-focus camera 44 is used to find the light spot first, and then the long-focus camera 43 is used for detection. The operation process of the present invention is simple and clear, does not require professional skills or complicated operations, and improves work efficiency and user experience. The accuracy of the present invention can be controlled by the focal length of the telephoto camera 43. Through a precise measuring device and a positioning device, high-precision coaxiality measurement is achieved, ensuring the performance and stability of the equipment. Users can adjust the parameters and functions of the equipment according to specific needs. For example, cameras with different focal lengths and light sources of different wavelengths can be selected and combined according to actual needs to meet the needs of different application scenarios. Compared with traditional axis alignment equipment, the design of replaceable modules also greatly reduces the maintenance cost of the present invention, thereby solving the problems of complex operation, high maintenance cost and low precision of existing detection methods.

[0032] Compared with traditional shaft alignment equipment, the present invention has outstanding advantages such as simple structure, easy operation, controllable precision, modular design, low maintenance cost and wide application. It can not only measure the coaxiality of the equipment but also measure the inclination and rotation error of the equipment's shaft system. It can meet actual needs and has significant technical effects and market value.

[0033] See also Figure 3 to Figure 4 In a second aspect, a method for detecting the coaxiality between a mechanical axis and an optical axis of an optomechanical device is used for the tooling for detecting the coaxiality between a mechanical axis and an optical axis of an optomechanical device as described in the first aspect, comprising the following steps:

[0034] S1 selects the camera focal length for detection.

[0035] Specifically, a suitable camera focal length is selected to meet different accuracy requirements. The longer the focal length, the higher the accuracy. Usually, a short-focus camera 44 is used to find the light spot, and then a long-focus camera 43 is used for detection.

[0036] S2 places the corner cube prism 3 and records the coordinates;

[0037] Specifically, the corner cube prism 3 is placed between the optical machine to be measured and the detection optical path 6, and the collimating lens emits a parallel light beam that passes through the corner cube prism 3 and then returns to the camera entering the detection optical path 6, and the spot coordinates (x s ,y s ) and the coordinates (x L ,y L ).

[0038] S3 uses plane mirror 2 to replace corner cube prism 3;

[0039] Specifically, remove the corner cube prism 3 and stick the plane mirror 2 tightly to the light outlet of the light meter.

[0040] S4 aligns the inspection fixture with the light meter and performs displacement and angle adjustment;

[0041] Specifically, align the inspection fixture with the optical machine to be measured, adjust the xyz displacement so that the collimated red light hits the center of the plane mirror 2 (light exit hole), and then adjust the angle of the optical machine adjustment platform 1 so that the light spot appears in the field of view of the rough camera, and then fine-tune the angle to move the light spot to (x s ,y s ), at this time, the telephoto camera 43 can observe the light spot, and move the light spot to (x L ,y L ).

[0042] S5 rotates the light exit hole and observes;

[0043] Specifically, let the optical machine light hole rotate (electrically or manually) for at least two times. If there is a deviation between the optical axis and the mechanical axis of the optical machine, the light spot will move in a circle. The jitter when drawing a circle can be represented by the axis inclination rotation error δ of the device. The system collects the light spot data of the telephoto camera 43 and fits it into an approximate circle and solves the center of the circle (x0, y0). After stopping the rotation, the coordinates are (x t ,y t ).

[0044] S6 calculates new coordinates and radius;

[0045] Specifically, after calculating Δx=x L -x0, Δy=y L -y0 and get the new coordinates (x n ,y n ), where x n =x t +Δx,y n =y t +Δy, use 3σ to calculate the radius of the circle.

[0046] S7 adjusts the angle to move the light spot to repeatedly rotate the light exit hole and perform observation and calculation until the coordinates are stable and no longer change.

[0047] Specifically, adjust the angle to move the light spot to (x n ,y n ), repeat steps S4-S5 until x t =x n ,y t =y n , the coordinates no longer change. At this time, 3σ tends to be stable, so 3σ at this time is the coaxiality, and δ is the inclination rotation error of the shaft system.

[0048] Beneficial effects:

[0049] 1. The tooling and method for detecting the coaxiality between the mechanical axis and the optical axis of an optomechanical device provided by the present invention have a simple structure: the structural design of the present invention is simpler, easy to manufacture and operate, and reduces the production cost and the use cost.

[0050] 2. The tooling and method provided by the present invention for detecting the coaxiality of the mechanical axis and the optical axis of an optomechanical device are easy to operate: the operation process of the present invention is simple and clear, does not require professional skills or complicated operations, and improves work efficiency and user experience.

[0051] 3. The tooling and method provided by the present invention for detecting the coaxiality of the mechanical axis and the optical axis of optomechanical equipment have controllable accuracy: the accuracy of the present invention can be controlled by the focal length of the telephoto camera, and high-precision coaxiality measurement is achieved through precise measuring and positioning devices, thereby ensuring the performance and stability of the equipment.

[0052] 4. The tooling and method for detecting the coaxiality between the mechanical axis and the optical axis of an optomechanical device provided by the present invention adopts a modular design: the user can adjust the parameters and functions of the device according to specific needs. For example, cameras with different focal lengths and light sources with different wavelengths can be selected and combined according to actual needs to meet the needs of different application scenarios. Compared with traditional axis alignment equipment, the design of replaceable modules also greatly reduces the maintenance cost of the present invention.

[0053] 5. The tooling and method provided by the present invention for detecting the coaxiality of the mechanical axis and the optical axis of optomechanical equipment are widely used: the present invention is applicable to various optomechanical and electrical integrated equipment, including but not limited to laser communication terminals and other equipment that require strict alignment of the optical axis and the mechanical axis, and has broad application prospects.

[0054] 6. The present invention provides a tool and method for detecting the coaxiality of the mechanical axis and the optical axis of an optomechanical device, which can not only measure the coaxiality of the device but also measure the inclination and rotation error of the shaft system of the device, and can also meet actual needs, with significant technical effects and market value.

[0055] What is disclosed above is only a preferred embodiment of the tooling and method for detecting the coaxiality of the mechanical axis and the optical axis of an optomechanical device of the present invention. Of course, this cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiments and equivalent changes made in accordance with the claims of the present invention still fall within the scope of the invention.

Claims

1. A tool for detecting the coaxiality between the mechanical axis and the optical axis of an optical-mechanical device, characterized in that: It includes two adjustment platforms, a plane mirror, a corner cube prism, a detection optical path and a computer system; The plane mirror is installed in front of the optical machine to be measured, the corner cube prism is installed between the two adjustment platforms, the detection light path is installed on the adjustment platform, and the computer system is connected to the detection light path through a network cable or a USB.

2. The tool for detecting the coaxiality between the mechanical axis and the optical axis of an optical-mechanical device according to claim 1, characterized in that: The adjustment platform consists of an xyz three-axis translation platform and a pitch azimuth angle adjuster.

3. The tool for detecting the coaxiality between the mechanical axis and the optical axis of an optical-mechanical device according to claim 1, characterized in that: The corner cube prism is used to return the incident light beam at the original angle, the incident light beam is parallel to the outgoing optical fiber and in the opposite direction, and is used to calibrate the initial circle center coordinates.

4. The tool for detecting the coaxiality between the mechanical axis and the optical axis of an optical-mechanical device according to claim 1, characterized in that: The detection optical path includes a 633nm laser, two beam splitting prisms, a telephoto camera and a short focal length camera, and is used to detect the coaxiality of the optical axis.

5. A method for detecting the coaxiality between the mechanical axis and the optical axis of an optomechanical device, used in the tooling for detecting the coaxiality between the mechanical axis and the optical axis of an optomechanical device as claimed in any one of claims 1 to 4, characterized in that: The following steps are involved: Select the camera focal length for detection; Use a plane mirror to replace the corner cube; Align the inspection fixture with the light meter and adjust the displacement and angle; Rotate the light exit hole and observe; Calculate new coordinates and radius; Adjust the angle to move the light spot to repeatedly rotate the light exit hole and perform observation and calculation until the coordinates are stable and no longer change; Place the corner cube and record the coordinates.

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