A method for detecting positioning repeatability of temperature-controlled turntable

Abstract

The present invention discloses a method for detecting the positioning repeatability of a temperature-controlled turntable. The method uses an electronic theodolite to obtain multiple sets of azimuth and elevation angles at room temperature. The method then controls the temperature of the temperature-controlled turntable's temperature chamber, obtaining multiple sets of azimuth and elevation angles at each temperature point using the electronic theodolite. Finally, the azimuth repeatability, i.e., the inner frame positioning repeatability, is calculated based on all the azimuth data. The electronic theodolite does not need to be strictly aligned with the normal direction of the reflective component and is not easily affected by external light. Therefore, the electronic theodolite can accurately aim and read data through the glass window of the temperature chamber. This method can detect the positioning repeatability of the inner frames of various models of temperature-controlled turntables under high and low temperature conditions. The method is simple to use, convenient, and flexible, and has broad application prospects in detecting the positioning repeatability of the inner frames of various models of temperature-controlled turntables.

Description

Technical Field

[0001] The present invention relates to, and in particular to, a method for detecting the positioning repeatability of an inner frame of a temperature-controlled turntable under high and low temperature conditions. Background Art

[0002] At present, the positioning repeatability of the inner frame of the temperature-controlled turntable is usually tested at room temperature using a 23-faceted prism and a photoelectric autocollimator in accordance with GJB 1801-93 "Main Performance Test Methods for Inertial Technology Test Equipment".

[0003] The temperature-controlled turntable comes with a temperature chamber. When performing positioning repeatability testing under high or low temperature conditions, the temperature chamber door must be closed first, and then the temperature of the temperature chamber must be set to high or low. The photoelectric autocollimator needs to be aimed and read through the temperature chamber glass window. However, when performing imaging aiming, the normal direction of the photoelectric autocollimator and the plane mirror must be strictly at the same horizontal height. Therefore, it is difficult for the photoelectric autocollimator to achieve imaging aiming through the temperature chamber glass window. At the same time, the photoelectric autocollimator is easily interfered by external light. When the light is weak or strong, it will cause imaging difficulties or constantly changing readings. When passing through the temperature chamber glass window, the light intensity becomes relatively weak, making it difficult for the photoelectric autocollimator to achieve aiming and reading. In summary, it can be seen that it is difficult to use the photoelectric autocollimator to achieve positioning repeatability testing of the inner frame of the temperature-controlled turntable under high and low temperature conditions. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for detecting the positioning repeatability of a temperature-controlled turntable, so as to solve the problem that the prior art cannot use a photoelectric autocollimator to detect the positioning repeatability of an inner frame of a temperature-controlled turntable under high and low temperature conditions.

[0005] The present invention solves the above technical problems through the following technical solutions: a method for detecting the positioning repeatability of a temperature-controlled turntable, wherein a reflective component is provided on the inner frame surface of the temperature-controlled turntable, and an electronic theodolite is set up near the temperature-controlled turntable. The detection method comprises the following steps:

[0006] Step 1: Adjust the electronic theodolite so that its optical axis is perpendicular to the reflective assembly, read the azimuth angle α1 (T1) and pitch angle β1 (T1) displayed on the electronic theodolite at room temperature, and record the position of the inner frame of the temperature-controlled turntable at this time as the initial position;

[0007] Step 2: Control the inner frame of the temperature-controlled turntable to rotate 360 ​​degrees, adjust the electronic theodolite so that its optical axis is perpendicular to the reflective assembly, and read the azimuth angle α2 (T1) and pitch angle β2 (T1) displayed on the electronic theodolite at room temperature;

[0008] Step 3: Repeat the above steps 2n times to obtain n sets of azimuth angles α at room temperature i (T1) and pitch angle βi (T1), and then get the N groups of azimuth angles α at room temperature i (T1) and pitch angle β i (T1), where N = n + 2;

[0009] Step 4: Control the temperature of the temperature box of the temperature-controlled turntable to reach and maintain at T2;

[0010] Step 5: Repeat steps 1 to 3 to obtain N groups of azimuth angles α at temperature T2 i (T2) and pitch angle β i (T2);

[0011] Step 6: Control the temperature of the temperature box of the temperature-controlled turntable to reach and maintain the temperature at the next temperature point, repeat steps 4 to 5, until the azimuth and elevation angle tests at all temperature points are completed, and N groups of azimuth and elevation angles at different temperature points are obtained;

[0012] Step 7: Calculate the azimuth repeatability, i.e., the inner frame positioning repeatability, based on the N groups of azimuth and elevation angles at different temperature points in step 6.

[0013] Furthermore, the temperature-controlled turntable is a temperature-controlled single-axis turntable, a temperature-controlled double-axis turntable or a temperature-controlled three-axis turntable.

[0014] Furthermore, the reflective component is a plane mirror component or a prism component.

[0015] Furthermore, the reflective assembly is located at the center of the inner frame axis.

[0016] Furthermore, the temperature points include all temperature points within the detection temperature range at intervals of 5°C.

[0017] Furthermore, in step 7, the azimuth repeatability calculation formula is:

[0018]

[0019] Where σ is the azimuth repeatability, α i (T j ) is the temperature T j is the i-th azimuth under , N is the number of azimuths obtained under each temperature point, M is the number of temperature points, is the average value of all azimuths at all temperature points.

[0020] Furthermore, a leveling step is further included before step 1, and the specific implementation process of the leveling step is:

[0021] An electronic level is used to adjust the levelness of the temperature-controlled turntable and the electronic theodolite so that the reflective component on the inner frame table of the temperature-controlled turntable and the electronic level are at the same level.

[0022] Beneficial effects

[0023] Compared with the prior art, the advantages of the present invention are:

[0024] The present invention provides a method for detecting the positioning repeatability of a temperature-controlled turntable. At each temperature point, a set of azimuth and pitch angles are first collected at an initial position, and then a set of azimuth and pitch angles are collected every 360° rotation. The electronic theodolite does not need to be strictly aligned with the normal direction of the reflective component and is not easily interfered with by external light. Therefore, the electronic theodolite can be accurately aimed and read through the glass window of the temperature chamber. The method can realize the positioning repeatability detection of the inner frame of various models of temperature-controlled turntables under high and low temperature conditions. The method is simple to use, convenient and flexible, and has broad application prospects in the positioning repeatability detection of the inner frame of various models of temperature-controlled turntables. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only one embodiment of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 2 is a schematic structural diagram of a device for detecting positioning repeatability of an inner frame of a temperature-controlled turntable according to an embodiment of the present invention;

[0027] Figure 2 It is a flow chart of the method for detecting positioning repeatability of a temperature-controlled turntable in an embodiment of the present invention.

[0028] Among them, 1-temperature controlled turntable, 2-reflective component, 3-temperature box glass window, 4-inner frame table, 5-electronic theodolite. DETAILED DESCRIPTION

[0029] The following is a clear and complete description of the technical solutions of the present invention in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0030] The following specific embodiments are used to describe the technical solution of the present application in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0031] Figure 1This is a schematic diagram of the structure of a device for detecting repeatability of the inner frame positioning of a temperature-controlled turntable. The reflective assembly 2 is fixed to the inner frame surface 4 of the temperature-controlled turntable 1. The temperature chamber door is closed, and an electronic theodolite 5 with its own light source is set up near the temperature-controlled turntable 1. The temperature-controlled turntable 1 and the electronic theodolite 5 are located on the same vibration-isolated foundation. An electronic level is used to adjust the level of the temperature-controlled turntable 1 and the electronic theodolite 5 so that the electronic level 5 and the reflective assembly 3 on the inner frame surface of the temperature-controlled turntable 1 are at the same level. This allows for horizontal propagation and reflection of light, facilitating subsequent aiming and imaging of the electronic theodolite 5 while reducing the reading error of the electronic theodolite 5. In one specific embodiment of the present invention, the level error of the temperature-controlled turntable is ≤5", and the level error of the electronic theodolite is 1".

[0032] In a specific embodiment of the present invention, the reflective component is a plane mirror or a prism.

[0033] In a specific embodiment of the present invention, the reflective component is located at the center of the inner frame axis of the temperature-controlled turntable, which facilitates aiming and imaging of the electronic theodolite.

[0034] like Figure 2 As shown, an embodiment of the present invention provides a method for detecting positioning repeatability of a temperature-controlled turntable, comprising the following steps:

[0035] Step 1: Azimuth and pitch angle test at the initial position at room temperature

[0036] The temperature of the temperature box of the temperature-controlled turntable is at room temperature T1. The temperature-controlled turntable is started so that all axes of the temperature-controlled turntable are in an angular position control state. The pitch angle and azimuth angle of the electronic theodolite are adjusted by adjusting the pitch axis and azimuth knob of the electronic theodolite so that the optical axis of the electronic theodolite is perpendicular to the plane mirror or prism. The light source is turned on, and the light reflected back by the plane mirror or prism can realize clear imaging of the electronic theodolite. The azimuth angle α1 (T1) and pitch angle β1 (T1) displayed on the electronic theodolite at this time are read, and the position of the inner frame of the temperature-controlled turntable at this time is recorded as the initial position, that is, a set of azimuth angles α1 (T1) and pitch angles β1 (T1) at room temperature are obtained.

[0037] In this embodiment, the initial position can be any position.

[0038] Step 2: Azimuth and pitch angle test at 360° rotation at room temperature

[0039] The inner frame of the temperature-controlled turntable is controlled to rotate 360°, that is, return to the initial position, and the electronic theodolite is adjusted so that the optical axis of the electronic theodolite is perpendicular to the plane mirror or prism to achieve clear imaging of the electronic theodolite. The azimuth angle α2(T1) and the pitch angle β2(T1) displayed on the electronic theodolite at this time are read to obtain a set of azimuth angles α2(T1) and pitch angles β2(T1) at room temperature.

[0040] Step 3: Repeat step 2 multiple times to obtain multiple sets of azimuth angles α at room temperature i (T1) and pitch angle β i (T1), aim and read once per rotation.

[0041] In this embodiment, step 2 is repeated 4 times (i.e., n=4), and four sets of azimuth angles α are obtained. i (T1) and pitch angle β i (T1), plus steps 1 and 2 to obtain two sets of azimuth angles α i (T1) and pitch angle β i (T1), we get six sets of azimuth angles α at room temperature: i (T1) and pitch angle β i (T1), that is, N=n+2=6.

[0042] Step 4: Temperature Adjustment

[0043] The temperature of the temperature box is set to T2, and the temperature of the temperature box is controlled to reach and remain at T2, and the holding time is generally more than 2 hours. The detection temperature range is determined according to actual needs, and a temperature point is determined every 5°C within the detection temperature range. In this embodiment, the detection temperature range is -30°C to 50°C, and a total of 17 temperature points are set, specifically -30°C, -25°C, -20°C, -15°C, -10°C, -5°C, 0°C, 5°C, 10°C, 15°C, 20°C, 25°C, 30°C, 35°C, 40°C, 45°C, and 50°C. When controlling the temperature of the temperature box, first adjust the temperature of the temperature box to the lowest temperature point, and then increase it in sequence until it reaches the highest temperature point, that is, T2 is -30°C, the next temperature point is -25°C, and the next temperature point is -20°C, and so on, until the reading of N groups of azimuth and pitch angles at the highest temperature point of 50°C is completed.

[0044] Step 5: Repeat steps 1 to 3 to obtain N groups of azimuth angles α at temperature T2 i (T2) and pitch angle β i (T2).

[0045] Step 6: Control the temperature of the temperature box of the temperature-controlled turntable to reach and maintain the temperature at the next point, and repeat steps 4 to 5 until the azimuth and elevation angle tests at all temperature points are completed, thereby obtaining N groups of azimuth and elevation angles at different temperature points.

[0046] In this embodiment, the temperature points are room temperature and 17 temperature points within the range of -30°C to 50°C. There are 6 sets of azimuth angles and elevation angles at each temperature point, that is, M=18 and N=6.

[0047] Step 7: Azimuth Repeatability Calculation

[0048] Calculate the azimuth repeatability, i.e., the inner frame positioning repeatability, based on the N groups of azimuth and elevation angles at different temperature points in step 6. The specific calculation formula is:

[0049]

[0050] Where σ is the azimuth repeatability, α i (T j ) is the temperature T j is the i-th azimuth under , N is the number of azimuths obtained under each temperature point, M is the number of temperature points, is the average value of all azimuth angles at all temperature points. T1 is room temperature, T2 is the lowest temperature point in the detection temperature range, T2<T3<T4<…

[0051] The above disclosure is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of changes or modifications within the technical scope disclosed in the present invention, and they should all be covered by the scope of protection of the present invention.

Claims

1. A method for detecting positioning repeatability of a temperature-controlled turntable, characterized in that: A reflective component is provided on the inner frame surface of the temperature-controlled turntable, and an electronic theodolite is set up near the temperature-controlled turntable. The detection method includes the following steps: Step 1: Adjust the electronic theodolite so that its optical axis is perpendicular to the reflective assembly, read the azimuth angle α1 (T1) and pitch angle β1 (T1) displayed on the electronic theodolite at room temperature, and record the position of the inner frame of the temperature-controlled turntable at this time as the initial position; Step 2: Control the inner frame of the temperature-controlled turntable to rotate 360 ​​degrees, adjust the electronic theodolite so that its optical axis is perpendicular to the reflective assembly, and read the azimuth angle α2 (T1) and pitch angle β2 (T1) displayed on the electronic theodolite at room temperature; Step 3: Repeat the above steps 2n times to obtain n sets of azimuth angles α at room temperature i (T1) and pitch angle β i (T1), and then get the N groups of azimuth angles α at room temperature i (T1) and pitch angle β i (T1), where N = n + 2; Step 4: Control the temperature of the temperature box of the temperature-controlled turntable to reach and maintain at T2; Step 5: Repeat steps 1 to 3 to obtain N groups of azimuth angles α at temperature T2 i (T2) and pitch angle β i (T2); Step 6: Control the temperature of the temperature box of the temperature-controlled turntable to reach and maintain the temperature at the next temperature point, repeat steps 4 to 5, until the azimuth and elevation angle tests at all temperature points are completed, and N groups of azimuth and elevation angles at different temperature points are obtained; Step 7: Calculate the azimuth repeatability, i.e., the inner frame positioning repeatability, based on the N groups of azimuth and elevation angles at different temperature points in step 6; The azimuth repeatability calculation formula is: Where σ is the azimuth repeatability, α i (T j ) is the temperature T j is the i-th azimuth under , N is the number of azimuths obtained under each temperature point, M is the number of temperature points, is the average value of all azimuths at all temperature points.

2. The method for detecting positioning repeatability of a temperature-controlled turntable according to claim 1, wherein: The temperature-controlled turntable is a temperature-controlled single-axis turntable, a temperature-controlled double-axis turntable or a temperature-controlled three-axis turntable.

3. The method for detecting positioning repeatability of a temperature-controlled turntable according to claim 1, wherein: The reflective component is a plane mirror component or a prism component.

4. The method for detecting positioning repeatability of a temperature-controlled turntable according to claim 1, wherein: The reflective component is located at the center of the inner frame axis.

5. The method for detecting positioning repeatability of a temperature-controlled turntable according to claim 1, wherein: The temperature points include all temperature points within the detection temperature range at intervals of 5°C.

6. The method for detecting positioning repeatability of a temperature-controlled turntable according to any one of claims 1 to 5, wherein: Before step 1, a leveling step is also included, and the specific implementation process of the leveling step is: An electronic level is used to adjust the levelness of the temperature-controlled turntable and the electronic theodolite so that the reflective component on the inner frame table of the temperature-controlled turntable and the electronic level are at the same level.

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