CN104596420B - The accurate measurement method of laser tracker measuring basis prism square center position - Google Patents
The accurate measurement method of laser tracker measuring basis prism square center position Download PDFInfo
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- CN104596420B CN104596420B CN201510037500.7A CN201510037500A CN104596420B CN 104596420 B CN104596420 B CN 104596420B CN 201510037500 A CN201510037500 A CN 201510037500A CN 104596420 B CN104596420 B CN 104596420B
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Abstract
The invention discloses a kind of accurate measurement method of benchmark prism square center, the measurement to prism square center is realized using laser tracker measuring system, the method has obtained sufficient checking in airship second phase model.Specific method is：By the 0.5 of laser tracker and standard configuration " small target mirror; three normal surfaces to benchmark prism square carry out Point Measurement; the plane in each face is calculated using least square fitting; translate the Fitting Calculations into three coordinate systems by three normal surfaces again, the origin of coordinates is desired benchmark prism square center.The present invention instead of the method with transit survey benchmark prism square center completely, meet precision of the measuring basis prism square center precision in 0.07mm in the range of 10m, certainty of measurement is influenceed small by the position that instrument is put, certainty of measurement stabilization, high precision, speed is fast, substantially increases measurement efficiency.
Description
Technical field
The invention belongs to technical field of industrial measurement, and in particular to laser tracker measuring system is in optical reference prism square
Application on measuring center point position.
Background technology
There is the equipment of installation accuracy requirement on spacecraft, what conventional optical reference prism square was measured as precision of equipment installation
The regular cube of measuring basis, generally 20mm × 20mm × 20mm specifications, machining accuracy is 3 ".And the benchmark prism square center
Coordinate value of the position on spacecraft structure benchmark, measured equipment is in spacecraft structure coordinate required for typically representing user
The positional precision of system.And with the high-precision demand of the in-orbit docking of spacecraft, gesture stability etc., to benchmark prism square central point
The uncertainty of position measurement is it is also proposed that demand higher.As met 0.1mm uncertainty measurement demands in 10m, or in 20m in fact
The demand of existing 0.2mm.
The measurement at conventional spacecraft benchmark prism square center takes 2 theodolite intersection's measuring principles, it is necessary to two
Operating personnel, take aim at a little by human eye, by 2 face central points that measuring basis prism square is orthogonal, then are retracted in mirror
The value of 10mm, the method for carrying out calculating benchmark prism square center position, the method receives measuring environment, place and 2 theodolites
Decorating position is limited, artificially take aim at the pair warp and weft instrument measuring system such as difference in operation measurement point position measurement uncertainty influence compared with
Greatly, the certainty of measurement less than 0.2mm can be accomplished in 5m, electronic theodolite measuring system certainty of measurement is low in a word, speed is slow, efficiency compared with
It is low.
At present, the instrument and equipment used by domestic and international accurate measurement mainly includes：Electronic theodolite measuring system, Digital Photogrammetric System, three
Coordinate measuring system, laser tracking measurement system, Laser Radar Scanning measuring system etc..Precision highest measuring system category swashs
Optical tracker system measuring system, highest measurement precision reaches≤0.5 μm/m；Certainty of measurement can reach≤10 μm in 80m measurement ranges；
Using speed >=1000 point/second, and the measurement of benchmark prism square central point is directed to, undoubtedly laser tracker measurement is precision highest
's.And how to realize laser tracker to the measurement at prism square center and how to ensure certainty of measurement it is critical that.
The content of the invention
It is an object of the invention to provide a kind of accurate measurement of new laser tracker measuring basis prism square center position
Method, it is intended to improve certainty of measurement and operating efficiency.
To achieve the above objectives, the present invention is adopted the following technical scheme that：
A kind of accurate measurement method of laser tracker measuring basis prism square center position, comprises the following steps：
1) according to the position of measured benchmark prism square, height and fixed position that laser sets up with instrument are adjusted；
2) laser tracker measuring system carries out online preheating 30 minutes, starts computer and enters people's laser tracker calibration journey
Sequence, forward sight/backsight precision calibration and compensation are carried out using the flat base of laser tracker 1.5 " measurement target ball, 1.5 "；
3) calibration menu is exited, enters people's SA software measuring systems, it is online to carry out type selecting, and selected element measurement menu；
4) using IFM interferometries, select laser tracker 0.5, " measurement target ball is distinguished on three normal surfaces of prism square
Uniform design is not less than 5 measurement points, and measuring sequence is according to measured counterclockwise mode；
5) mode for meeting right-hand rule is chosen, formation level, side-play amount selection offsets downward laser tracker 0.5 and " surveys
The radius size (6.35mm) of target ball is measured, is corresponded to be defined as A faces, B faces, C faces respectively；
6) mode for choosing construction coordinate system is three methods in face, and A faces, B faces, C faces are fitted into coordinate system, side-play amount
/ 2nd of prism square length are chosen, is finally given and benchmark prism square coordinate is set to by the coordinate system of three orthogonal surface constructions
System；
7) the origin value of benchmark prism square coordinate system is the benchmark prism square central point position of laser tracker measurement
Put.
Wherein, the radius size of laser tracker 0.5 " measurement target ball is 6.35mm.
The present invention instead of the method with transit survey benchmark prism square center completely, have the effect that：
Measuring method of the invention, than the measuring system such as theodolite, laser radar, photogrammetric, is measuring basis cube
Mirror center precision highest method.And, certainty of measurement is influenceed small by instrument putting position, certainty of measurement good stability, speed
Degree is fast, substantially increases measurement efficiency.
Brief description of the drawings
Three normal surfaces of prism square and center schematic diagram on the basis of Fig. 1.
Wherein：1-1 is prism square A faces；1-2 is prism square B faces；1-3 is prism square C faces；1-4 is prism square central point.
Fig. 2 is the setting schematic diagram of laser tracker of the invention.
Wherein：2-1 is laser tracker；2-2 is laser tracker support.
Fig. 3 is the setting direction schematic diagram of prism square minute surface measurement point in the method for the present invention.
Wherein：3-1 is the 1st point on cube minute surface；3-2 is the 2nd point on cube minute surface；3-3 is on cube minute surface
3rd point.
Fig. 4 is the schematic diagram of laser measurement annex in the method for the present invention.
Wherein：" measurement target ball that 4-1 is laser tracker 1.5；4-2 is the " base of laser tracker 1.5；4-3 be laser with
Track instrument 0.5 " measures target ball.
Specific embodiment
Measurement process of the invention is described in detail below in conjunction with accompanying drawing, these explanations are only schematical, and
It is not intended to carry out any limitation to protection scope of the present invention.
1. the required equipment and annex at laser tracker measuring basis prism square center
Laser tracker measuring system include laser tracker head, laser tracker special stand, notebook computer, swash
Optical tracker system control cabinet, laser tracker measuring system configuration Proofreading Software TrackerCalib and Spatial Analyzer are surveyed
Amount software (abbreviation SA softwares).
Frock annex needed for measurement：Glue rifle and appropriate glue stick (outsourcing), specification are 20mm × 20mm × 20mm cubes
(target ball and base are the flat base of mirror, laser tracker 1.5 " measurement target ball, laser tracker 0.5 " measurement target ball, 1.5 "
The annex of laser tracker measuring system standard configuration).
1) according to the position of Fig. 1 benchmark prism squares, in the distance apart from 3m~5m, laser tracker 2- of the invention is placed
The 1 and laser tracker support 2-2 of support laser tracker, its concrete structure is referring to Fig. 2.Adjust laser tracker support to conjunction
Suitable height (determines three normal surface 1-1 prism square A faces of benchmark prism square, 1-2 prism square B faces, 1-3 prism square C faces can be by
Laser tracker measurement head is traced into, and setting direction is referring to Fig. 3).Glue stick is fitted into glue rifle, plug-in is preheated；With preheating
Good glue rifle fixes laser tracker support.
2) line of connection laser tracker, control cabinet and notebook computer；Start computer, enter people's TrackerCalib journeys
Sequence, preheating 30 minutes is carried out to laser tracker.Using 4-1 laser trackers 1.5 " measurement target ball, 4-2 laser trackers 1.5 "
Flat base, in the vicinity that benchmark prism square is put, carry out forward sight/backsight precision calibration and compensation, compensation result control exists
Within 0.001mm, the schematic diagram of wherein laser measurement annex is shown in Fig. 4.
3) calibration menu is exited, enters people's SA software measuring systems, carry out on-line operation, then selected element measurement menu.
4) IFM interferometries, " the measurement target ball, respectively in the A of Fig. 1 benchmark prism squares of selection 4-3 laser trackers 0.5 are used
Face, B faces, on the normal surface of three, C faces, measuring sequence is according to the 1st point of the 3-1 cubes of minute surface indicated in Fig. 3；3-2 cubes of minute surface the 2nd
Point；3-3 cubes of the 3rd point of minute surface；Measured counterclockwise mode；Uniform design is not less than 5 measurement points and measures.
5) its three-dimensional point coordinate value under laser tracker coordinate system is obtained by a measurement.To measure on each face
Point calculates least square fitting plane by least square fitting, and during formation level, selection meets the mode of right-hand rule,
Choose side-play amount offset downward 6.35mm (laser tracker 0.5 " measurement target ball radius size), respectively correspond to be defined as A faces,
B faces, C faces.
6) with A faces, B faces, the orthogonal surface construction coordinate system in three, C faces, side-play amount chooses the length of 1/2nd prism square,
Finally give prism square coordinate system on the basis of being set by the coordinate system of A faces, B faces, the orthogonal surface construction in three, C faces；
7) the origin value of benchmark prism square coordinate system is 1-4 cubes shown in Fig. 1 of laser tracker measurement
Mirror center position.
The benchmark prism square specification of measurement can be different, and the selected point on cube minute surface also can be different, and benchmark stands
The machining accuracy of Fang Jing also can be variant, but can be using the point on the method measuring basis cube minute surface, and construction face and seat
Mark system, i.e., data processing method ditto just can obtain the coordinate value of prism square center position.
Measuring method of the invention disclosure satisfy that in the range of 10m measuring basis prism square (specification 20mm × 20mm ×
20mm, angle reaches U=0.07mm, K=2 (confidential intervals less than 3 ") center position measurement expanded uncertainties between face and face
95%) precision.
Although specific embodiment of the invention is described in detail and is illustrated above, it should be noted that
We can make various changes and modifications to above-mentioned implementation method, but these are without departure from of the invention spiritual and appended power
Profit requires described scope.
Claims (2)
1. a kind of laser tracker measures the accurate measurement method of spacecraft benchmark prism square center position, comprises the following steps：
1) according to the position of measured benchmark prism square, height and fixed position that laser tracker sets up are adjusted；
2) laser tracker measuring system carries out online preheating 30 minutes, starts computer and enters laser tracker calibration program, profit
Forward sight/backsight precision calibration and compensation are carried out with the flat base of laser tracker 1.5 " measurement target ball, 1.5 "；
3) calibration menu is exited, into Spatial Analyzer software measuring systems, it is online to carry out type selecting, and selected element is surveyed
Amount menu；
4) IFM interferometries, " three normal surfaces of the measurement target ball in prism square of selection laser tracker laser tracker 0.5 are used
Upper uniform design respectively is not less than 5 measurement points, and measuring sequence is according to measured counterclockwise mode；
5) mode for meeting right-hand rule, formation level are chosen, " measurement target is chosen and offset downward laser tracker 0.5 to side-play amount
The radius size of ball, corresponds to be defined as A faces, B faces, C faces respectively；
6) mode for choosing construction coordinate system is to construct coordinate system with three normal surfaces, and A faces, B faces, C faces are fitted into coordinate
System, side-play amount chooses 1/2nd of prism square length, finally gives and is set to benchmark by the coordinate system of three orthogonal surface constructions and stands
Square mirror coordinate system；
7) the origin value of benchmark prism square coordinate system is the benchmark prism square center position of laser tracker measurement.
2. the method for claim 1, wherein laser tracker 0.5 " measures the radius size of target ball for 6.35mm.
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