Three-dimensional standard measuring system based on laser tracker

Abstract

The utility model relates to a three-dimensional standard measuring system based on a laser tracker, which comprises the laser tracker, a plane reflecting device and a measuring computer, and the laser tracker is in wireless connection with the measuring computer. The plane reflecting device comprises a plane reflecting mirror, a two-dimensional universal mirror bracket and a three-dimensional translation lifting platform from top to bottom, the plane reflecting mirror is connected with a mirror surface bracket of the two-dimensional universal mirror bracket and can perform pitch angle adjustment and mirror surface deflection angle adjustment, and a base of the two-dimensional universal mirror bracket is connected with the top of the three-dimensional translation lifting platform below the base. The three-dimensional translation lifting platform controls the platform to shift in the corresponding x-axis direction, y-axis direction and z-axis direction through arranged adjusting knobs, and position translation adjustment of the mirror surface in a three-axis coordinate system is achieved. According to the utility model, the laser path of the laser tracker is subjected to mirror reflection through the plane reflection device, so that the laser path is changed, and the action of carrying the stereoscopic standard for multiple times to adjust the position during measurement is reduced.

Description

Technical Field

[0001] The utility model relates to a measuring device, in particular to a three-dimensional standard measuring system based on a laser tracker, belonging to the technical field of precision engineering measurement. Background Art

[0002] With the continuous development of measurement objects and measurement technology, large-scale measurement is increasingly widely used in large-scale high-end equipment manufacturing sites such as aerospace, automobiles and ships, where the environment is complex, the measurement space range is large, and there are many interference factors. As one of the commonly used standards for geometric traceability in large-scale measurement sites, stereo standards play an important role in the accuracy verification of combined measurement, the external parameter calibration of networked measuring instruments, and the error calibration of collaborative measurement networks. Correctly calibrating its reference coordinate value is the key to ensuring the uniformity of the measurement value and reliable results of the large-scale measurement process, and is an important premise and foundation for ensuring the manufacturing of large-scale high-end equipment. The stereo standard is a coordinate calibration device with a "tetrahedron" stereo frame with four vertices providing reference coordinate values. It consists of 6 cylindrical rods and corner connectors set at both ends of the rods, and standard ball seats for placing spherical reflection targets are fixed on the four rod connectors. Since the stereo standards used for large-scale measurement are usually large in size, traditional measurement methods such as coordinate measuring machines are limited by range and accuracy, and cannot achieve high-precision traceability of large-scale stereo standards. When measuring stereo standards of 1 meter or less, the measurement uncertainty of traditional coordinate measuring machines can reach the micron level. However, when measuring stereo standards larger than 1 meter, the measurement uncertainty can only reach a dozen or even dozens of microns, which is difficult to meet the high-precision traceability requirements of large-scale stereo standards. Secondly, due to factors such as inconvenient transportation and unstable reference values, large-scale stereo standards usually need to be traced at large-scale measurement sites. Therefore, finding a measurement method for stereo standards that takes into account both measurement range and measurement accuracy is an urgent problem that needs to be solved.

[0003] The laser tracker has the advantages of high measurement accuracy, good dynamic performance, and large measurement range, and the interferometric length measurement accuracy is much lower than the angle measurement accuracy. Therefore, based on this feature, the laser tracker interferometric distance measurement module is used to measure the side length between two vertices of the stereo standard with high precision, and the coordinate values ​​of the four vertices of the stereo standard are calculated according to the geometric relationship between the side length and the vertex, so as to obtain the reference coordinate value of the stereo standard.

[0004] However, there are still some shortcomings in measuring the stereo standard by directly adjusting the laser tracker:

[0005] (1) The stereo standard is relatively bulky. When adjusting the laser tracker interferometric ranging, the stereo standard needs to be moved multiple times at a large angle and fixed to stabilize it, which increases the risk of collision between the stereo standard and rigid objects.

[0006] (2) After the laser tracker is fixed in position, it is inconvenient to move and cannot be finely adjusted to the laser tracker interferometric distance measurement. The introduction of the laser tracker angle measurement error will reduce the measurement accuracy of the side lengths of two adjacent vertices. Summary of the invention

[0007] The purpose of the utility model is to solve the defects of the prior art, design a stereo standard measuring system based on a laser tracker, adopt a plane reflection device to make the laser light path of the laser tracker mirror-bend and change its laser light path, so that the mirror origin of the laser tracker and the target balls at two adjacent vertices are on the same measuring axis, reducing the need to move and adjust the position of the stereo standard for many times, so as to realize the high-precision measurement of the interferometric ranging module of the laser tracker, calculate the coordinate value of each vertex through the geometric relationship of the stereo standard, so as to obtain the reference coordinate value of each vertex of the stereo standard, the utility model not only solves the problem that it is difficult to accurately obtain the reference coordinate value of each vertex of the large-size stereo standard by using a coordinate measuring machine, but also solves the deficiency of measuring the stereo standard by directly adjusting the laser tracker.

[0008] The utility model is implemented as follows: a stereo standard measuring system based on a laser tracker, characterized in that: the measuring system includes a laser tracker, a plane reflection device and a measuring computer, the laser tracker is wirelessly connected to the measuring computer, the plane reflection device includes three parts from top to bottom: a plane reflector, a two-dimensional universal mirror frame and a three-dimensional translation lifting platform, the plane reflector is connected to the mirror bracket of the two-dimensional universal mirror frame through rotating rods arranged on both sides, and the pitch angle adjustment of the plane reflector mirror surface is achieved by horizontally flipping around the rotating rod, a vertical rotation axis is arranged at the center axis position of the bottom surface of the mirror bracket to connect with the base of the two-dimensional universal mirror frame, the mirror bracket can rotate vertically around the rotation axis on the base of the two-dimensional universal mirror frame to achieve the deflection angle adjustment of the mirror surface, and the mirror bracket of the two-dimensional universal mirror frame is provided with adjustment knobs for realizing the horizontal flipping of the mirror surface and the vertical deflection angle adjustment respectively. The bottom surface of the base of the two-dimensional universal mirror frame is provided with mounting screw holes, which are connected with the top bolts of the three-dimensional translation lifting platform below through the mounting screw holes. The three-dimensional translation lifting platform includes three platforms that move along the x, y, and z directions in the three-axis coordinate system respectively, and the platforms are controlled to shift to the corresponding x, y, and z directions through the respective adjustment knobs to achieve the position translation adjustment of the plane reflector in the three-axis coordinate system.

[0009] The plane reflection device is fixed on the front side of the vertex of the bottom edge of the stereo standard, and the plane reflection device and the line connecting two adjacent vertices of the bottom edge of the laser tracker and the stereo standard are acute angles.

[0010] The specific steps of measuring using the utility model are as follows:

[0011] Step 1: Place the stereo standard to be measured on the work surface, fix the assembled plane reflection device in front of the vertex of one bottom side of the stereo standard, set up the laser tracker, and make the angle formed by the laser tracker and the line connecting the two vertices of the bottom side of the stereo standard to be measured to the plane reflection device an acute angle.

[0012] Step 2, aligning the laser tracker with the target balls at two adjacent vertices of the bottom edge of the stereo standard, including coarse adjustment and fine adjustment. Place the target balls on two adjacent vertices of the bottom edge of the stereo standard to be measured, adjust the plane reflection device, and monitor the horizontal angle and vertical angle of the two vertices in the monitoring window of the measurement software in turn until the horizontal angle and vertical angle values ​​of the two vertices are equal, so that the mirror origin of the laser tracker and the target balls at two vertices of the stereo standard are on the same measurement axis, and the alignment of the laser tracker with the target balls at two adjacent vertices of the bottom edge of the stereo standard is completed.

[0013] The details are as follows:

[0014] (1) Coarse alignment: Place a 1.5-inch through-hole steel ball at the first vertex of the stereo standard, and a through-hole steel ball of the same specification and a laser pen at the second vertex. The laser pen is placed in the through-hole steel ball and points to the first vertex. Coarsely adjust the plane reflection device so that the laser beam emitted by the laser pen at the second vertex passes through the through-hole steel ball at the first vertex, and then is reflected by the plane reflection device to the light outlet of the laser tracker.

[0015] (2) Fine-tuning the alignment: After the rough alignment is completed, remove the through-hole steel balls at the first vertex and the second vertex and place a 1.5-inch target ball. The laser beam emitted by the laser tracker first reaches the target ball at the first vertex after being reflected by the plane reflection device. Adjust the adjustment knob of the plane reflection device. Adjust the horizontal flip, vertical deflection angle of the mirror and the x, y, and z axis offsets of the three-dimensional translation and lifting platform as needed to make the reflection point at the center of the mirror, and record the horizontal angle and vertical angle values ​​of the vertex obtained by the laser tracker. Then move the target ball to the second vertex, fine-tune the adjustment knob of the plane reflection device, so that the horizontal angle and vertical angle values ​​obtained here are as close as possible to the values ​​obtained at the first vertex and record them. Then place the target ball at the first and second vertices again, repeat the adjustment work, and fine-tune the adjustment knob of the plane reflection device each time until the horizontal angle and vertical angle values ​​obtained at the two vertices are equal, so that the mirror origin of the laser tracker and the target ball at the first and second vertices are on the same measurement axis.

[0016] Step 3: The laser beam emitted by the laser tracker is reflected by the plane reflection device and then aimed at the target ball at the first vertex, and the position coordinate data of the target ball at the first vertex is read.

[0017] Step 4, manually move the target ball along the laser light path between the first vertex and the adjacent second vertex to the position of the second vertex, read the position coordinate data of the target ball at the second vertex, calculate the distance between the two read position coordinate data, and calculate the length between the target ball at the first vertex and the second vertex by the distance formula between two points, that is, the side length of the bottom edge between two adjacent vertices of the stereo standard.

[0018] Step 5, keep the laser tracker and the plane reflection device in the same position, move the stereo standard, replace the two adjacent vertices to be measured of the stereo standard, repeat steps 2 to 4, measure the lengths of the remaining sides of the stereo standard respectively, establish a coordinate system, and calculate the reference coordinate values ​​of the four vertices of the stereo standard by geometric relationships.

[0019] Specifically, a coordinate system is established with the first vertex measured on the bottom side of the stereo standard as the origin, the line connecting it and the second vertex measured as the X-axis, and the plane determined by the third vertex on the bottom of the stereo standard as the XOY plane. In the established coordinate system, a vertex-side length relationship equation is established based on geometric relationships, and the reference coordinate values ​​of each vertex are calculated. The lengths of the six sides of the corresponding stereo standard are recorded as: l 12 , l 13 , l 23 , l 14 , l 24 , l 34 , the reference coordinate values ​​of the four vertices are recorded as: , , , .

[0020] The vertex-edge length relationship equation is as follows:

[0021] .

[0022] The utility model matches a laser tracker with a plane reflection device, and by adjusting the position, pitch and deflection angle of the plane reflection device, the laser path emitted by the laser tracker can be changed, so that the mirror origin of the laser tracker and the target balls at two adjacent vertices are conveniently located in the same measurement axis, thereby realizing the measurement of the lengths of the sides of the stereo standard by the interference ranging module of the laser tracker, and combining the Cartesian coordinate system established by the four vertices of the stereo standard and the equation established by the geometric relationship of the lengths of the sides of the stereo standard, the reference coordinate values ​​of the vertices of the stereo standard can be obtained by calculation.

[0023] The beneficial effect of the utility model is that the utility model realizes a measurement method in which a plane reflection device deflects the laser path emitted by the laser tracker and cooperates with each other, so that the laser tracker interference ranging module can achieve high-precision measurement of the length of each side of the stereo standard, thereby solving the problem that the coordinate measuring machine in the prior art cannot measure large-size stereo standards.

[0024] The utility model has simple measurement steps, convenient operation, is applicable to different scenes and venues, and has high measurement accuracy, high efficiency, low cost, and is not limited to the size of the stereo standard. At the same time, the utility model is not limited to the coordinate measurement of tetrahedral stereo standards of various sizes, but can also be used for the length measurement and coordinate measurement of one-dimensional length standards and stereo standards of various shapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the positional relationship among the laser tracker, the plane reflection device and the stereo standard in the measurement of the utility model.

[0026] Figure 2 It is a structural schematic diagram of the plane reflection device in the utility model.

[0027] In the figure: 1. first vertex; 2. second vertex; 3. third vertex; 4. fourth vertex; 5. stereo standard; 6. plane reflection device; 7. laser tracker; 61. plane reflector; 62. two-dimensional universal mirror frame; 63. three-dimensional translation and lifting platform. DETAILED DESCRIPTION

[0028] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] According to the attached Figure 1 and attached Figure 2 The utility model is a stereo standard measuring system based on a laser tracker. The measuring system includes a laser tracker 7, a plane reflection device 6 and a measuring computer. The laser tracker is wirelessly connected to the measuring computer. The plane reflection device 6 includes three parts from top to bottom: a plane reflector 61, a two-dimensional universal mirror frame 62 and a three-dimensional translation and lifting platform 63.

[0030] According to the attached Figure 2The plane reflector 61 is connected to the mirror bracket of the two-dimensional universal mirror frame 62 through the rotating rods arranged on the two sides, and can be horizontally flipped around the rotating rods to adjust the pitch angle of the plane reflector 61. A vertical rotation axis is arranged at the center axis position of the bottom surface of the mirror bracket to connect with the base of the two-dimensional universal mirror frame 62. The mirror bracket can rotate vertically around the rotation axis on the base of the two-dimensional universal mirror frame 62 to adjust the deflection angle of the mirror. The mirror bracket of the two-dimensional universal mirror frame 62 is provided with adjustment knobs for adjusting the horizontal flipping and vertical deflection angle of the mirror. The bottom surface of the base of the two-dimensional universal mirror frame 62 is provided with mounting screw holes, which are connected to the top bolts of the three-dimensional translation lifting platform 63 below through the mounting screw holes. The three-dimensional translation lifting platform 63 includes three platforms that move along the x, y, and z directions in the three-axis coordinate system respectively. Through the adjustment knobs set respectively, the platforms can be controlled to shift to the corresponding x, y, and z directions respectively, thereby realizing the translation adjustment of the position of the plane reflector 61 in the three-axis coordinate system.

[0031] The specific steps of measuring using the utility model are as follows:

[0032] Step 1: Assembly and placement of the plane reflection device 6

[0033] According to the attached Figure 2 , assemble the plane reflector 61, the two-dimensional universal mirror frame 62 and the three-dimensional translation and lifting platform 63 of the plane reflector 6 in sequence, and place them in front of a vertex on the bottom edge of the stereo standard 5.

[0034] According to the attached Figure 1 The three vertices of the bottom surface of the stereo standard are the first vertex 1, the second vertex 2 and the third vertex 3, and the fourth vertex 4 is located at the top. The plane reflection device 6 is fixed in front of the first vertex 1 of the stereo standard 5, and a laser tracker 7 is set up, and the angles between the plane reflection device 6 and the laser tracker 7 and the first vertex 1 and the second vertex 2 adjacent to the bottom edge of the stereo standard 5 are made acute.

[0035] Step 2: Align the laser tracker 7 with the two adjacent vertex target balls at the bottom edge of the stereo standard.

[0036] 1) Coarse alignment: Place a 1.5-inch through-hole steel ball at the first vertex 1 of the stereo standard 5, and place a through-hole steel ball and a laser pen of the same specification at the second vertex 2. The laser pen is placed in the through-hole steel ball and points to the first vertex 1. Coarsely adjust the plane reflection device 6 so that the laser beam emitted by the laser pen at the second vertex 2 passes through the through-hole steel ball at the first vertex 1, and then is reflected by the plane reflection device 6 to the light outlet of the laser tracker 7.

[0037] 2) Fine adjustment of the light: After the rough adjustment of the light is completed, remove the through-hole steel balls at the first vertex 1 and the second vertex 2, and place a 1.5-inch target ball. The laser beam emitted by the laser tracker 7 first reaches the target ball at the first vertex 1 after being reflected by the plane reflection device 6, and the adjustment knob of the plane reflection device 6 is adjusted. The horizontal flip, vertical deflection angle of the mirror surface and the x, y, and z axis offsets of the three-dimensional translation and lifting platform 63 are adjusted as needed to make the reflection point at the center of the mirror surface, and record the horizontal angle and vertical angle values ​​of the vertex here obtained by the laser tracker 7. Then move the target ball to the second vertex 2, fine-tune the adjustment knob of the plane reflection device 6, so that the horizontal angle and vertical angle values ​​obtained here are as close as possible to the values ​​obtained at the first vertex 1 and record them. Then place the target ball repeatedly at the first vertex 1 and the second vertex 2, repeat the adjustment work, and fine-tune the adjustment knob of the plane reflection device 6 each time until the horizontal angle and vertical angle values ​​obtained at the two vertices are equal, respectively, so that the mirror origin of the laser tracker 7 and the target ball at the first vertex 1 and the second vertex 2 are on the same measurement axis.

[0038] Step 3: Measure the length between two adjacent vertices on the bottom edge of the stereo standard

[0039] After the alignment is completed, the target ball is placed at the first vertex 1. The laser beam emitted by the laser tracker 7 is reflected by the plane reflection device 6 and then aimed at the target ball at the first vertex 1, and the position coordinate data of the target ball at the first vertex 1 is read. Then the target ball is manually moved along the laser light path between the first vertex 1 and the second vertex 2 to the second vertex 2. During the movement, the laser beam is kept aimed at the target ball, and the position coordinate data of the target ball at the second vertex 2 is read. The length between the target ball at the first vertex 1 and the second vertex 2 is calculated by the distance formula between two points, that is, the length of a bottom edge between the first vertex 1 and the second vertex 2 of the stereo standard is obtained, which is recorded as: l 12 .

[0040] Step 4: Measure the lengths of the six sides of the stereo standard

[0041] Keep the laser tracker 7 and the plane reflector 6 unchanged, move the stereo standard 5, adjust the position of the plane reflector 6, and measure the other sides of the stereo standard 5 according to steps 2 and 3, until the lengths of the six sides of the stereo standard are obtained, which are recorded as: l 12 , l 13 , l 23 , l 14 , l 24 , l 34 .

[0042] Step 5: Calculation of the reference coordinate values ​​of the vertices of the stereo standard

[0043] A Cartesian coordinate system is established with the first vertex 1 of the stereo standard 5 as the origin, the line connecting the first vertex 1 and the second vertex 2 as the X-axis, and the plane defined by the first vertex 1, the second vertex 2 and the third vertex 3 as the XOY plane. In the established coordinate system, the following vertex-side length relationship equation is established based on the geometric relationship, and the reference coordinate values ​​of each vertex of the stereo standard 5 are calculated and recorded as: , , , .

[0044] The vertex-side length relationship equation is:

[0045] .

[0046] The utility model introduces a plane reflection device in the measurement of a stereo standard to change the laser path of a laser tracker, and adjusts the position, pitch and deflection angle of the plane reflection device instead of adjusting the position of the laser tracker and the stereo standard, so as to realize high-precision measurement of the length of each side of the stereo standard by an interference ranging module of the laser tracker, and establishes a Cartesian coordinate system, and obtains the reference coordinate value of each vertex of the stereo standard according to the geometric relationship between the length of each side and the vertex of the stereo standard in the established coordinate system. Example

[0047] This embodiment uses the utility model to measure the reference coordinate values ​​of each vertex of a 1000mm stereo standard.

[0048] According to the attached Figure 1 and attached Figure 2 The specific measurement steps are as follows:

[0049] Step 1: Assembly of the plane reflection device 6

[0050] According to the attached Figure 2 , assemble the plane reflector 61, the two-dimensional universal mirror frame 62 and the three-dimensional translation and lifting platform 63 of the plane reflection device 6 in order, the size of the plane reflector 61 matches the mirror bracket of the two-dimensional universal mirror frame 62, and the mirror surface on the front side is the reflection surface. The two-dimensional universal mirror frame 62 is provided with adjustment knobs in the two directions of pitch and deflection, which can realize the pitch and deflection angle adjustment of the mirror around its horizontal axis and vertical axis, and the adjustment resolution is 0.005°. The three-dimensional translation and lifting platform 63 is provided with adjustment knobs in the three directions of x, y, and z coordinate axes, and the adjustment resolution is 0.02mm, which can realize the horizontal distance displacement and vertical height lifting adjustment in the three directions of x, y, and z.

[0051] Step 2: Placement of the plane reflection device 6

[0052] The plane reflection device 6 is fixed to the front side of the first vertex 1 of the stereo standard 5, and a laser tracker 7 is set up, and the angle between the plane reflection device 6 and the laser tracker 7 and the first vertex 1 and the second vertex 2 adjacent to the bottom edge of the stereo standard 5 is an acute angle. The laser tracker 7 is a Leica AT960 laser tracker.

[0053] Step 3: The laser tracker 7 performs rough alignment with the through-hole steel balls at two adjacent vertices on the bottom edge of the stereo standard.

[0054] like Figure 2 As shown, a 1.5-inch through-hole steel ball is placed at the first vertex 1, a through-hole steel ball of the same specification and a laser pen are placed at the second vertex 2, and the laser pen is placed inside the through-hole steel ball and points to the first vertex 1. The position of the plane reflection device 6 is adjusted so that the reflection angle of the laser emitted by the laser pen is less than 90°, and the reflection point is roughly at the center of the plane reflector 61. The adjustment knobs of the two-dimensional universal mirror frame 62 and the adjustment knobs of the three-dimensional translation and lifting platform 63 are adjusted so that the laser reflected by the mirror points to the light outlet of the laser tracker 7, and the coarse adjustment of the light is completed.

[0055] Step 4: The laser tracker 7 is finely adjusted to align the target balls at two adjacent vertices on the bottom edge of the stereo standard.

[0056] The laser tracker 7 is wirelessly connected to the measuring computer, and the three-dimensional analysis measurement software on the measuring computer is started and the laser tracker 7 is initialized. The measuring software adopts the SpatialAnalyzer software (SA for short) developed by New River Kinematics, USA. The target ball is placed at the first vertex 1, and the adjustment knobs of the two-dimensional universal mirror frame 62 and the adjustment knobs of the three-dimensional translation lifting platform 63 are fine-tuned so that the laser reflection point is located at the center of the mirror surface. The laser emitted by the laser tracker 7 is reflected by the mirror surface of the plane reflection device 6 and is aimed at the target ball at the first vertex 1. Open the measuring software and record the horizontal angle and vertical angle values ​​of the target ball at the first vertex 1 in its monitoring window. The target ball is placed at the second vertex 2, and the plane reflection device 6 is fine-tuned so that the horizontal angle and vertical angle are as close as possible to the values ​​of the first vertex 1. The target ball is moved to the first vertex 1 and the second vertex 2 again to repeat the adjustment work until the horizontal angle and vertical angle values ​​of the two are equal, and the fine adjustment of the light is completed. At this time, the mirror origin of the laser tracker 7 and the target balls at the first vertex 1 and the second vertex 2 are on the same measurement axis.

[0057] Step 5: Measure the target ball position coordinates of two adjacent vertices

[0058] The target ball is placed at the first vertex 1, and the coordinates of the target ball position are measured using the measurement software. When the laser tracker is aimed at the target ball and the light is not cut off, the target ball is manually moved to the second vertex 2 along the laser light path between the first vertex 1 and the second vertex 2. Then the position coordinates of the target ball at the second vertex 2 are measured, and the distance between the target ball at the first vertex 1 and the second vertex 2 is calculated. The side length between the first vertex 1 and the second vertex 2 of the stereo standard is obtained, which is recorded as: l 12 .

[0059] Step 6: Get the lengths of the remaining five sides of the stereo standard

[0060] The positions of the laser tracker 7 and the plane reflection device 6 do not change. The stereo standard 5 is rotated at the original position, and another side to be measured is replaced to the laser light path. Steps 3 and 4 are repeated to measure the position coordinates of the two vertices corresponding to the remaining five sides of the stereo standard, and the lengths of the remaining five sides are calculated, which are recorded as: l 13 , l 23 , l 14 , l 24 , l 34 .

[0061] Step 7: Establish the edge length-vertex relationship equation and calculate the vertex reference coordinate value

[0062] The first vertex 1 of the stereo standard 5 is taken as the origin, the line connecting the first vertex 1 and the second vertex 2 is taken as the X-axis, and the plane defined by the first vertex 1, the second vertex 2 and the third vertex 3 is taken as the XOY plane, and a Cartesian coordinate system is established. The coordinates of each vertex are expressed as , i represents the vertex number. In the constructed coordinate system, the vertex-edge length relationship equation is established by geometric relationship:

[0063] .

[0064] According to the above equation, the reference coordinate value of each vertex in the constructed coordinate system is obtained, as shown in the following table, in mm.

[0065] Table 1 Reference coordinate values ​​of the vertices of the stereo standard

[0066]

[0067] It can be seen from Table 1 that, by adopting the present invention, the measurement accuracy of the stereo standard can reach the micron level and is not limited by the size of the stereo standard.

[0068] Finally, it should be understood that the above specific embodiments are further detailed descriptions of the purpose, technical solutions and beneficial effects of the utility model, and are not used to limit the protection scope of the utility model. For ordinary technicians in this field, without paying creative labor, they can also make local changes based on the technical solutions disclosed in the utility model. Any modifications, equivalence or equivalent substitutions made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A stereo standard measuring system based on a laser tracker, characterized in that: The measuring system comprises a laser tracker, a plane reflection device and a measuring computer. The laser tracker is wirelessly connected to the measuring computer. The plane reflection device comprises three parts in order from top to bottom: a plane reflection mirror, a two-dimensional universal mirror frame and a three-dimensional translation lifting platform. The plane reflection mirror is connected to a mirror bracket of the two-dimensional universal mirror frame through rotating rods arranged on two sides. The pitch angle adjustment of the plane reflection mirror is achieved by horizontally flipping around the rotating rods. A vertical rotation axis is arranged at the center axis position of the bottom surface of the mirror bracket and is connected to the base of the two-dimensional universal mirror frame. The mirror bracket performs a vertical rotation action on the base of the two-dimensional universal mirror frame around the rotation axis to achieve the deflection angle adjustment of the mirror. The base of the two-dimensional universal mirror frame is connected to the top of the three-dimensional translation lifting platform below. The three-dimensional translation lifting platform comprises three platforms that move respectively along the x, y and z three-axis directions in the three-axis coordinate system, and the platforms are respectively controlled to deviate to the corresponding x, y and z three-axis directions through the respective adjustment knobs to achieve the position translation adjustment of the plane reflection mirror in the three-axis coordinate system.

2. According to claim 1, a laser tracker-based stereo standard measuring system is characterized by: The mirror bracket of the two-dimensional universal mirror frame is provided with adjustment knobs for adjusting the horizontal flipping and vertical deflection angle of the mirror. The two-dimensional universal mirror frame is connected to the top bolt of the three-dimensional translation lifting platform below through the mounting screw holes provided on the bottom surface of its base.

3. According to the laser tracker-based stereo standard measurement system of claim 1, it is characterized by: The plane reflection device is fixed on the front side of the vertex of the bottom edge of the stereo standard, and the plane reflection device and the line connecting two adjacent vertices of the bottom edge of the laser tracker and the stereo standard are acute angles.

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