CN113624257B - Method for testing horizontal one-measurement-back precision of theodolite - Google Patents
Method for testing horizontal one-measurement-back precision of theodolite Download PDFInfo
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- CN113624257B CN113624257B CN202110906693.0A CN202110906693A CN113624257B CN 113624257 B CN113624257 B CN 113624257B CN 202110906693 A CN202110906693 A CN 202110906693A CN 113624257 B CN113624257 B CN 113624257B
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- 238000001514 detection method Methods 0.000 claims 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C25/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C1/00—Measuring angles
- G01C1/02—Theodolites
Abstract
The invention discloses a method for testing the horizontal one-time return precision of a theodolite, which comprises the following steps: (1) Adjusting the multi-tooth indexing table to 0 degrees, and arranging the theodolite to be measured on the multi-tooth indexing table; (2) Aligning the image of the cross hair captured by the camera with a standard cross hair in a computer, and then zeroing the angle alpha on the display panel; (3) Under the positive mirror state, the multi-tooth dividing table is rotated by an angle delta beta, and then the collimating part is rotated, so that the camera captures the image of the cross wire, and the test angle theta is recorded 1 The method comprises the steps of carrying out a first treatment on the surface of the (4) Repeatedly executing the step (3), and rotating the multi-tooth indexing table by an angle delta beta along the same direction each time; (5) Switching to a reverse mirror state, and repeatedly executing the steps (3) - (4) to obtain a plurality of groups of reverse mirror test angles theta' i The method comprises the steps of carrying out a first treatment on the surface of the (6) Analysis of θ i θ'. i And calculating to obtain the horizontal direction one-measurement return precision mu of the theodolite to be measured. The invention can save manpower, reduce the intensity of test work, increase the accuracy of data recording and improve the test efficiency.
Description
Technical Field
The invention relates to the field of surveying and mapping instruments, in particular to a method for testing horizontal one-time measurement accuracy of a theodolite.
Background
The theodolite is a geodetic precision photoelectric goniometer for measuring azimuth angles of horizontal planes and pitch angles of vertical planes. The horizontal one-measurement accuracy is used as one of the most important technical indexes in theodolite test, is also the basis for dividing the accuracy grade of the theodolite, and is a standard for measuring the azimuth measurement accuracy of the theodolite. Therefore, the theodolite needs to be subjected to a horizontal-direction one-time accuracy test before leaving the factory, and can be sold and used only if the accuracy reaches the qualified standard. The existing theodolite horizontal direction one-measuring-back precision test mainly relies on the naked eyes to observe and measure and record data, and because the steps and the data involved in the test process are numerous, the defects of easy error in data recording links, easy fatigue in naked eye observation and measurement and the like exist, and the test efficiency is low.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides an automatic, efficient and high-test-precision horizontal one-measurement-back-precision testing method for theodolites.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the utility model provides a theodolite horizontal direction one test method of accuracy of finding back, the theodolite that awaits measuring includes base and standard portion, standard portion can set up with rotating around the rotation central line on the base, the rotation central line is followed the direction of height of theodolite that awaits measuring extends, the theodolite that awaits measuring includes the display panel that is used for showing standard portion around the rotation central line is relative the angle alpha of base rotation, standard portion includes the eyepiece, have the cross silk in the eyepiece, the test method includes the following steps:
(1) Adjusting the horizontally placed multi-tooth indexing table to beta 0 The theodolite to be measured is arranged on the multi-tooth indexing table, and the base is fixedly connected with the multi-tooth indexing table, so that the base and the multi-tooth indexing table can coaxially rotate;
(2) Rotating the collimating part to enable light rays emitted by the light source to project the image of the cross wire into a lens of a camera through the collimator, aligning the image of the cross wire captured by the camera with a standard cross wire in a computer, and then zeroing the angle alpha on the display panel;
(3) The position of the light source is kept unchanged, the theodolite to be measured is in a positive mirror state, the multi-tooth indexing table is rotated by an angle delta beta, the collimating part is rotated again, the camera captures the image of the cross wire, and the computer calculates to obtain a transverse offset angle delta gamma between the image of the cross wire and the standard cross wire 1 At this time, the angle on the display panel is alpha 1 Then the positive mirror tests the angle theta 1 =α 1 +Δγ 1 ；
(4) Repeating the step (3) n times, each time rotating the multi-tooth indexing table by an angle Δβ in the same direction, the Δβ=360°/n, wherein when the total rotation angle β of the multi-tooth indexing table is i When the positive mirror test angle of the theodolite to be tested is =i×Δβ i =α i +Δγ i Wherein i is more than or equal to 1 and less than or equal to n;
(5) Converting the theodolite to be tested into a reverse mirror state, repeatedly executing the steps (3) - (4), and rotating the multi-tooth indexing table by an angle delta beta along the same direction each time to obtain a plurality of groups of reverse mirror test angles theta'. i ；
(6) Analyzing the θ by the computer i θ'. i And calculating to obtain the horizontal direction one-measurement return precision mu of the theodolite to be measured.
Preferably, after the step (6), the method further comprises a step (7): if mu is less than or equal to mu 0 The computer judges that the theodolite to be detected is qualified and tests the positive mirror by an angle theta i The reverse mirror test angle theta' i And uploading the test result mu to a database; if said mu>μ 0 The computer judges that the theodolite to be detected is unqualified, the theodolite to be detected is subjected to rectifying, modifying and repairing, and the steps (1) - (d) are executed again after repairing7）。
Further preferably, the μ 0 =2”。
Preferably, said n=23, said Δβ=15° 39'7.8".
Preferably, the test method further comprises the step (0-1): and (3) turning on the light source, the camera and the computer, wherein the computer is respectively and electrically connected or in communication with the camera, the computer and the theodolite to be tested, and the step (0-1) and the step (1) are not sequentially performed.
Preferably, the test method further comprises the step (0-2): the light source is fixedly arranged on a light source support, the light source support is detachably arranged on a workbench, and the step (0-2) and the step (1) are not sequential.
Further preferably, in the step (0-2), the light source holder is detachably mounted to the table by a magnetic member.
Preferably, the test method further comprises the step (0-3): and (3) sequentially setting the light source, the theodolite to be tested, the collimator and the camera from back to front along the projection direction of the light source, wherein the steps (0-3) and (1) are not sequential.
Preferably, the test method further comprises the step (0-4): the camera is arranged on a guide rail, the guide rail extends along the projection direction of the light source, the camera can slide back and forth along the guide rail, and the steps (0-4) and (1) are not sequential.
Further preferably, in the step (2), the camera is slid back and forth along the guide rail to adjust a focal length so that the cross hair can be imaged in the camera.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the method for testing the horizontal one-time return precision of the theodolite has high degree of automation, the cross marks in the ocular of the theodolite to be tested are not required to be aligned with the reference coordinates by naked eyes, accurate measurement data can be obtained by only roughly aligning the ocular with a camera and processing the ocular by a computer, the measured data can be sent and recorded by the inside of the computer, errors of the data in the manual input process are avoided, the labor force is saved, the strength of testing work is reduced, the accuracy of data recording is increased, and the testing efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a test system for the horizontal-direction one-measurement-back accuracy of an existing theodolite of the applicant;
FIG. 2 is a schematic diagram of a data recording interface of the test system of FIG. 1;
FIG. 3 is a schematic diagram of a system for testing a theodolite for a horizontal direction of a return accuracy in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of a computer standard cross-hair interface in this embodiment;
wherein: 100. theodolite to be measured; 110. a base; 120. an aiming part; 121. an aiming bracket; 122. a telescope; 122a; an eyepiece; 122b, an objective lens; 123. a display panel; 200. a multi-tooth indexing table; 210. a machine table; 220. a rotary table; 300. a reference coordinate; 400. a work table; 400a, a first mesa; 400b, a second table top; 410. a bottom plate; 420. a guide rail; 431. a lens holder; 432. a guide member; 433. a collimator support; 500. a light source; 510. a light source support; 600. a collimator; 700. a camera; 710. a lens assembly; 1. an image of a cross hair; 2. standard cross filaments; 3. a tester; x, a first rotation center line; y, a second rotation center line; z, a third rotation center line; p, the projection direction of the light source.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art.
Referring to fig. 1 and 2, a testing system for a horizontal direction and a return accuracy of an existing theodolite of an applicant is shown, the testing system comprises a workbench 400, a tester 3 is located at one side (right side in the example of the view angle shown in the figure) of the workbench 400 during testing, and the testing system further comprises a multi-tooth indexing table 200, a collimator 600 and a reference coordinate 300 which are sequentially arranged on the workbench 400 along a direction gradually far away from the tester 3.
Among them, the multi-tooth indexing table 200 is used for precise rotation angle control with a precision of 0.1". The multi-tooth index table 200 includes a table 210 and a rotary table 220 rotatably provided on the table 210 about a second rotation center line Y, the table 210 being horizontally provided on the table 400, the second rotation center line Y extending in a vertical direction. The multi-tooth indexing table 200 is marked with scales, so that the angle beta of the rotating table 220 relative to the machine 210 can be read, and the angle beta is used as a reference standard angle in the test process.
The collimator 600 is cylindrical for generating a parallel light beam so that the tester 3 can observe the standard cross wire in the reference coordinate 300 through the eyepiece 122a of the theodolite 100 to be measured.
The theodolite 100 to be measured comprises a base 110 and an aiming part 120, wherein the aiming part 120 can be rotatably arranged on the base 110 around a first rotation center line X, and the first rotation center line X extends along the height direction of the theodolite 100 to be measured. The collimating part 120 further comprises a collimating bracket 121, a telescope 122 and a display panel 123, wherein the telescope 122 can be rotatably arranged on the collimating bracket 121 around a third rotation center line Z, and the third rotation center line Z extends along the width direction of the theodolite 100 to be measured. Telescope 122 has eyepiece 122a and objective 122b on opposite sides along its length, and eyepiece 122a has a cross wire for alignment with the target. During a theodolite horizontal-direction-return accuracy test, the cross hair in eyepiece 122a is primarily used to align with a standard cross hair in reference coordinate 300 to achieve accuracy measurement.
The display panel 123 is used for displaying the angle α of rotation of the collimating part 120 relative to the base 110 about the first rotation center line X, and the display panel 123 has two groups of display panels 123 disposed on two different sides of the collimating bracket 121 along the thickness direction thereof, and the display contents of the two groups of display panels 123 are the same.
In use of theodolite 100 under test, eyepiece 122a is positioned adjacent to the human eye and objective lens 122b is positioned adjacent to the object to be observed, so that tester 3 can observe an image magnified by objective lens 122b from eyepiece 122 a. The theodolite 100 to be measured has a positive mirror state and a reverse mirror state when in use, and in the positive mirror state, the telescope 122 is vertically rotated by 180 degrees around the third rotation center line Z, so that the theodolite can be converted into the reverse mirror state; conversely, in the inverted state, the telescope 122 can be vertically rotated 180 ° about the third rotation center line Z to be converted into the positive state. The two symmetrical sets of display panels 123 are arranged to facilitate reading by the user in both the forward and reverse mirror positions. The arrangement of the positive mirror state and the negative mirror state is helpful to improve the measurement accuracy of the theodolite, and the specific concept and the distinguishing method thereof are common knowledge well known to those skilled in the art, and are not described herein.
Based on the test system, the existing test method for the horizontal one-measurement-back precision of the theodolite by the applicant comprises the following steps:
s1, adjusting the rotation angle of the rotary table 220 of the multi-tooth indexing table 200 to beta 0 Base 110 of theodolite 100 to be tested is fixedly arranged on rotary table 220, so that base 110 and rotary table 220 can rotate coaxially, i.e. so that first rotation center line X and second rotation center line Y extend substantially collinearly, it is emphasized here that "substantially" because there is usually a slight error (also the error to be measured by the present test method) in theodolite 100 to be tested, it cannot be guaranteed that first rotation center line X extends completely in the vertical direction;
s2, adjusting the collimator 600 to be consistent with the extension direction of the telescope 122, and abutting the reference coordinate 300 against one end of the collimator 600, which is far away from the telescope 122, so that the tester 3 can observe the standard cross hair in the reference coordinate 300 through the ocular 122a;
s3, rotating the adjustment and collimation part 120, aligning the cross wire in the ocular 122a with the standard cross wire on the reference coordinate 300 by naked eyes, and then zeroing the horizontal angle alpha on the display panel 123;
s4, in the positive mirror state, rotating the rotary table 220 towards one direction (clockwise or anticlockwise) by delta beta=15° 39'7.8 "(=360 °/23), keeping the base 110 of the theodolite 100 to be tested fixedly connected with the rotary table 220, horizontally rotating the collimating part 120, realigning the cross wire in the eyepiece 122a with the standard cross wire on the reference coordinate 300 by naked eyes, and recording the horizontal angle alpha of rotation on the display panel 123 1 ；
S5, repeating the step S4 for 23 times, each time rotating the rotary table 220 by the same angle delta beta along the same direction, when the total rotation angle of the rotary table 220 is beta i When=15° 39'7.8"×i, the horizontal angle α of rotation on the display panel 123 of the theodolite 100 to be measured was recorded i I is more than or equal to 1 and less than or equal to 23, and a total of 23 groups of positive mirror test angles alpha are obtained i ；
S6, repeatedly executing the steps S4-S5 in the reverse mirror state to obtain 23 groups of reverse mirror test angles alpha' i ；
S7, testing the angle alpha of the positive mirror i Angle of reverse mirror test alpha' i Inputting the measured theodolite 100 into a computer, calculating average value, difference value, direction value and the like, and finally obtaining the horizontal direction one-measurement back precision of the theodolite to be measured, wherein a data recording interface is shown in fig. 2.
Therefore, the existing theodolite horizontal direction one-measurement-back precision testing system and testing method of the applicant relate to a great deal of labor which depends on manpower, namely, the human eyes are required to align the cross wires with the standard cross wires and record data manually, and each theodolite 100 to be tested needs a great deal of repeated labor, so that the testing efficiency is very low in practical operation, and the tester 3 is very easy to fatigue, so that errors occur in the aligning and recording data process.
Therefore, the invention provides a novel theodolite horizontal direction one-measurement-back precision testing method which has the advantages of high automation degree, labor saving and improvement of testing efficiency and accuracy.
Referring to FIG. 3, a test system in accordance with an embodiment of the present invention is shown. The test system includes a stage 400, a light source 500 disposed on the stage 400, and a multi-tooth index table 200, a collimator 600, and a camera 700 sequentially disposed on the stage 400 from rear to front along a projection direction P of the light source. The multi-tooth indexing table 200 and the collimator 600 may have the same structure as that of the conventional testing system, and the structure of the theodolite 100 to be tested is also the same as that of the conventional testing system, and the theodolite 100 to be tested is also fixed on the rotary table 220 during testing.
In this embodiment, the camera 700 includes a long cylindrical lens assembly 710, the light source 500 is abutted against the eyepiece 122a of the theodolite 100 to be measured, the projection direction P of the light source extends along the horizontal direction, and the lens assembly 710, the collimator 600 and the telescope 122 of the theodolite 100 to be measured extend along the projection direction P of the light source in a collinear manner, so that the light source 500 can accurately project the image 1 of the cross hair in the eyepiece 122a into the lens assembly 710.
Further, to automate the testing method, the testing system further comprises a computer (not shown in the figure), which is electrically or communicatively connected to the camera 700, and to the theodolite 100 to be tested, respectively, and in which the computer has a standard cross wire 2 for reference to the image 1 of the cross wire. The computer is used for recording the angles alpha and beta, calculating a transverse offset angle delta gamma (see fig. 4) between the image 1 of the cross hair and the standard cross hair 2, further calculating a horizontal direction-measurement return precision mu of the theodolite 100 to be measured, and judging whether the precision mu of the theodolite 100 to be measured is qualified or not.
To further optimize the testing system, in the present embodiment, the workbench 400 has a first table top 400a and a second table top 400b, the second table top 400b is higher than the first table top 400a, the light source 500 and the multi-tooth indexing table 200 are disposed on the first table top 400a, and the collimator 600 and the camera 700 are disposed on the second table top, so that the theodolite 100 to be tested can be conveniently carried, the multi-tooth indexing table 200 can be operated, and the lens assembly 710, the collimator 600, the telescope 122 and the light source 500 can be disposed at the same level.
In this embodiment, the light source 500 is detachably disposed on the first table top 400a, so as to facilitate installation, maintenance, replacement, etc. Specifically, the light source 500 is fixedly disposed on the light source holder 510, and the light source holder 510 is detachably mounted on the first table 400 a. Here, the disassembly connection is specifically realized by using a magnetic element, a first magnetic element (not shown in the figure) is arranged at the bottom of the light source support 510, a second magnetic element (not shown in the figure) is arranged on the first table top 400a, and the first magnetic element and the second magnetic element can be magnetically attracted, so that the connection is stable, and the disassembly and the assembly are convenient. In other embodiments, the light source support 510 and the first table top 400a may be detachably connected by mechanical engagement.
In this embodiment, the bottom plate 410 is fixed on the second table 400b, and the camera 700 and the collimator 600 are both disposed on the bottom plate 410. The bottom plate 410 is made of aluminum alloy material, and is light, high in strength and low in cost. The collimator mount 433 is fixedly provided on the bottom plate 410 for fixedly supporting the collimator 600. The camera 700 and its lens assembly 710 are provided on the base plate 410 to be movable back and forth in the projection direction P of the light source. Specifically, along the projection direction P of the light source, the front end portion of the bottom plate 410 is located at the outer side of the second table 400b, so as to facilitate manual adjustment, a guide rail 420 extending along the projection direction P of the light source is fixed on the front end portion, the lens assembly 710 is fixed on the lens bracket 431, a guide member 432 is arranged at the bottom of the lens bracket 431, in this embodiment, the guide member 432 specifically adopts a roller, and the roller can be rollingly arranged on the guide rail 420 along the extending direction of the guide rail 420, so that the camera 700 and the lens assembly 710 thereof can be driven to slide back and forth along the guide rail 420, and the focal length can be adjusted.
The following specifically describes a method for testing a theodolite horizontal direction one-measurement accuracy in this embodiment, including the following steps:
(0-1) turning on the light source 500, the camera 700 and the computer, and enabling the computer to be electrically connected or in communication with the camera 700 and the theodolite 100 to be tested respectively;
(0-2) fixedly disposing the light source 500 on the light source holder 510, and mounting the light source holder 510 to the first table 400a through the first magnetic member;
(0-3) arranging the light source 500, the theodolite 100 to be tested, the collimator 600 and the camera 700 in sequence from back to front along the projection direction P of the light source;
(0-4) mounting the camera 700 on the guide rail 420, mounting the collimator 600 on the collimator mount 433, and mounting the base plate 410 on the second table 400 b;
(1) The rotation angle of the rotary table 220 of the horizontally placed multi-tooth indexing table 200 is adjusted to beta 0 =0°, fixedly arranging the base 110 of the theodolite 100 to be measured on the rotary table 220 so that the base 110 and the rotary table 220 can coaxially rotate;
(2) The light source 500 is lightened, the sighting portion 120 of the theodolite 100 to be tested is rotated, the objective lens 122b is aligned with the collimator tube 600, the camera 700 slides forwards and backwards along the guide rail 420, the focal length is adjusted, the light rays emitted by the light source 500 can project the image 1 of the cross wire in the eyepiece 122a into the lens component 710 through the collimator tube 600, the cross wire can clearly image in the camera 700, the rotation angle of the sighting portion 120 is further adjusted, the image 1 of the cross wire is completely aligned with the standard cross wire 2 in the computer, and then the angle alpha on the display panel 123 is reset to zero;
(3) The position of the light source 500 on the first table 400a is kept unchanged, the theodolite 100 to be measured is in a positive mirror state, the rotary table 220 is rotated by an angle delta beta=15° 39 '7.8', the collimating part 120 is rotated again, and when the object mirror 122b is approximately aligned with the collimator 600, the camera 700 can capture the image 1 of the cross wire again, so that the transverse offset angle delta gamma between the image 1 of the cross wire and the standard cross wire 2 can be calculated by the computer 1 At this time, the angle on the display panel 123 is α 1 Then the positive mirror tests the angle theta 1 =α 1 +Δγ 1 ；
(4) Repeating step (3) for 23 times, each time rotating the rotary table 220 by an angle Δβ in the same direction, when the total rotation angle β of the rotary table 220 i When =i×Δβ, the positive mirror test angle θ of the theodolite 100 to be measured i =α i +Δγ i Wherein 1.ltoreq.i.ltoreq.23, where, when alpha i >β i At the time of delta gamma i Is negative; when alpha is i <β i At the time of delta gamma i Positive values;
(5) Converting the theodolite 100 to be tested into a reverse mirror state, and repeatedly executing the steps (3) - (4), wherein the rotary table 220 is rotated by an angle delta along the same direction each timeBeta, a plurality of groups of reverse mirror test angles theta 'are obtained' i ；
(6) Analysis of θ by computer i θ'. i The horizontal one-measurement-back accuracy μ of the theodolite 100 to be measured is calculated.
(7) If mu is less than or equal to mu 0 The computer judges that the theodolite 100 to be tested is qualified and tests the positive mirror by an angle theta i Angle of reverse mirror test θ' i And uploading the test result mu to a database; if mu is>μ 0 The computer judges that the theodolite 100 to be tested is unqualified, the theodolite 100 to be tested is subjected to rectification and repair, and the steps (1) to (7) are carried out again after the repair, in the embodiment, mu 0 =2”。
Wherein, the steps (0-1), (0-2), (0-3), (0-4) and (1) are not separated from each other.
In this way, in the testing method of the embodiment, the tester 3 only needs to align the objective lens 122b approximately with the collimator 600, so that the precise alignment of the image 1 of the cross wire with the standard cross wire 2 by naked eyes is not required, and the manual data recording is not required, the labor intensity is greatly reduced, and the testing efficiency and the accuracy of data recording are both remarkably improved.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
Claims (9)
1. The utility model provides a theodolite horizontal direction one test method of accuracy of finding back, the theodolite that awaits measuring includes base and standard portion, standard portion can set up with rotating around the rotation central line on the base, the rotation central line is followed the direction of height of theodolite that awaits measuring extends, the theodolite that awaits measuring includes the display panel that is used for showing standard portion around the rotation central line is relative the angle alpha of base rotation, standard portion includes eyepiece and objective, have the cross hair in the eyepiece, its characterized in that, the test method includes the following steps:
(1) Adjusting the horizontally placed multi-tooth indexing table to beta 0 The theodolite to be measured is arranged on the multi-tooth indexing table, and the base is fixedly connected with the multi-tooth indexing table, so that the base and the multi-tooth indexing table can coaxially rotate;
(2) Rotating the collimating part to enable light rays emitted by the light source to project the image of the cross wire into a lens of a camera through the collimator, aligning the image of the cross wire captured by the camera with a standard cross wire in a computer, and then zeroing the angle alpha on the display panel;
(3) The position of the light source is kept unchanged, the theodolite to be measured is in a positive mirror state, the multi-tooth indexing table is rotated by an angle delta beta, the collimating part is rotated again, and when the objective lens is approximately aligned with the collimator tube, the camera can capture the image of the cross wire again, so that the computer calculates and obtains a transverse offset angle delta gamma between the image of the cross wire and the standard cross wire 1 At this time, the angle on the display panel is alpha 1 Then the positive mirror tests the angle theta 1 ＝α 1 +Δγ 1 ；
(4) Repeating the step (3) n times, each time rotating the multi-tooth indexing table by an angle Δβ in the same direction, the Δβ=360°/n, wherein when the total rotation angle β of the multi-tooth indexing table is i When the positive mirror test angle of the theodolite to be tested is =i×Δβ i ＝α i +Δγ i Wherein i is more than or equal to 1 and less than or equal to n;
(5) Converting the theodolite to be tested into a reverse mirror state, repeatedly executing the steps (3) - (4), and rotating the multi-tooth indexing table by an angle delta beta along the same direction each time to obtain a plurality of groups of reverse mirror test angles theta' i ；
(6) Analyzing the θ by the computer i θ'. i Calculating to obtain a first detection accuracy mu in the horizontal direction of the theodolite to be detected;
(7) If mu is less than or equal to mu 0 The computer judges the longitude and latitude to be measuredQualified instrument and testing the angle theta of the positive mirror i The reverse mirror test angle theta' i And uploading the test result mu to a database; if said mu>μ 0 And (3) judging that the theodolite to be detected is unqualified by the computer, rectifying, modifying and repairing the theodolite to be detected, and executing the steps (1) - (7) again after repairing.
2. The method for testing the horizontal one-time return accuracy of the theodolite according to claim 1, wherein: said mu 0 ＝2”。
3. The method for testing the horizontal one-time return accuracy of the theodolite according to claim 1, wherein: said n=23, said Δβ=15° 39'7.8".
4. The method for testing the horizontal one-time return accuracy of a theodolite according to claim 1, wherein said method further comprises the steps of (0-1): and (3) turning on the light source, the camera and the computer, wherein the computer is respectively and electrically connected or in communication with the camera, the computer and the theodolite to be tested, and the step (0-1) and the step (1) are not sequentially performed.
5. The method for testing the horizontal one-time return accuracy of a theodolite according to claim 1, wherein said method further comprises the steps of (0-2): the light source is fixedly arranged on a light source support, the light source support is detachably arranged on a workbench, and the step (0-2) and the step (1) are not sequential.
6. The method for testing the horizontal one-time return accuracy of the theodolite according to claim 5, wherein: in the step (0-2), the light source holder is detachably mounted to the table by a magnetic member.
7. The method for testing the horizontal one-time return accuracy of a theodolite according to claim 1, wherein said method further comprises the steps of (0-3): and (3) sequentially setting the light source, the theodolite to be tested, the collimator and the camera from back to front along the projection direction of the light source, wherein the steps (0-3) and (1) are not sequential.
8. The method for testing the horizontal one-time return accuracy of a theodolite according to claim 1, wherein said method further comprises the steps of (0-4): the camera is arranged on a guide rail, the guide rail extends along the projection direction of the light source, the camera can slide back and forth along the guide rail, and the steps (0-4) and (1) are not sequential.
9. The method for testing the horizontal one-time return accuracy of the theodolite according to claim 8, wherein: in the step (2), the camera is slid back and forth along the guide rail to adjust a focal length so that the cross hair can be imaged in the camera.
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