CN101865698B

CN101865698B - A Method of Discriminating Error Sources of Angle Measuring Instruments

Info

Publication number: CN101865698B
Application number: CN201010189623XA
Authority: CN
Inventors: 孟庆华
Original assignee: Changchun Institute of Optics Fine Mechanics and Physics of CAS
Current assignee: Changchun Institute of Optics Fine Mechanics and Physics of CAS
Priority date: 2010-06-02
Filing date: 2010-06-02
Publication date: 2012-04-11
Anticipated expiration: 2030-06-02
Also published as: CN101865698A

Abstract

The invention discloses a method for judging error source of angle measuring instrument, belonging to the technical field of precision instrument measurement, which comprises the following steps: two 0.2 'self-collimating tubes are used for mutually aiming to establish a datum line, and the error of the datum line is less than 1'; a plane reflector is fixed on a rotary table of the angle measuring instrument; rotating a rotary table of the angle measuring instrument, utilizing a plane reflector to respectively carry out self-calibration on the two light pipes, and recording the reading of an encoder of the angle measuring instrument; observing the condition that the angular difference value of the encoders aligned twice deviates 180 degrees, and if the measured deviation value is within the allowable deviation according to the overall precision distribution requirement of the angle measuring instrument, determining that an error source influencing the measurement precision is an optical aiming system; if the measured deviation value is not within the allowable deviation according to the overall precision distribution requirement of the angle measuring instrument, the error source influencing the measurement precision is a shaft or an encoder. The method can accurately and effectively judge the error source influencing the measurement precision, and can also be used as a method for process inspection of components of angle measuring instruments such as theodolites and the like.

Description

A kind of method of differentiating the error source of angle measuring instrument

Technical field

The present invention is mainly used in the photoelectric measurement field, belongs to the exact instrument field of measuring technique, relates to a kind of method of differentiating the error source of angle measuring instrument.

Background technology

Along with development and the application of angle measuring instrument, increasingly high to the measuring accuracy requirement of angle measuring instrument in fields such as national defence, military project, aerospaces.In order to guarantee the measuring accuracy of angle measuring instrument, debug with use in, when measuring accuracy was overproof, accurately the error in judgement source had become important link.Do absolute timing signal at Subnano-class high-precision dot diffraction interferometer, need accurately to rotate the measured optical unit and carry out the interferogram collection, the method for differentiating error source is complicated.After the single part of angle measuring instruments such as transit is debug detection, be assembled together again and carry out precision measure.When each parts debug detect qualified after, or after angle measuring instrument used a period of time, the measuring accuracy of instrument possibly not reach measurement requirement because it is more influence the parts and the factor of precision, it is relatively difficult to judge that sometimes which parts precision does not meet the demands.Therefore, how can differentiate the error source of angle measuring instrument rapidly and accurately, be problem anxious to be solved.

Summary of the invention

The purpose of this invention is to provide a kind of method of differentiating the error source of angle measuring instrument, this method can be differentiated the error source of angle measuring instrument rapidly and accurately, and is time saving and energy saving.

In order to achieve the above object, technical scheme of the present invention is following:

A kind of method of differentiating the error source of angle measuring instrument comprises the steps:

Step 1: with two 0.2 " the autocollimatic light pipe to taking aim at, is set up datum line mutually, and the datum line error is less than 1 ";

Step 2: a fixing plane mirror on the turntable of angle measuring instrument;

Step 3: rotate the turntable of angle measuring instrument, " the autocollimatic light pipe carries out autocollimatic, writes down the reading of angle measuring instrument scrambler respectively to two 0.2 to utilize plane mirror;

Step 4: the angle measuring instrument scrambler reading difference of observing twice autocollimatic departs from 180 ° situation; If the deviation value that records according to angle measuring instrument overall accuracy allocation requirements in permissible variation; Show that then axial system error, encoder errors meet the demands, the error source that influences measuring accuracy is an optical aiming system; If the deviation value that records not in permissible variation, shows then that the error source that influences measuring accuracy is axle system or scrambler according to angle measuring instrument overall accuracy allocation requirements; Thereby accomplish the method for the error source of differentiating angle measuring instrument.

The invention has the beneficial effects as follows: the factor of the decision influence angle measuring instrument measuring accuracy that this method can be accurate and effective is axle system, scrambler, or optical aiming system; Method of the present invention also can be used as the method for angle measuring instrument parts procedure inspections such as transit.

Embodiment

Below in conjunction with specific embodiment the present invention is done further explain.

The present invention differentiates the method for the error source of angle measuring instrument and in multiple angle measurement quasi-instrument, successfully tries out, such as, angle measuring instruments such as point-diffraction interferometer, transit.

Be that example explains that the present invention differentiates the method for error source below with the transit.

Concrete grammar is: with two 0.2 " the autocollimatic light pipe to taking aim at, is set up datum line mutually, and the datum line error is less than 1 "; Fixing a plane mirror on the transit four-way or on the transverse axis spindle nose; Rotate the Z-axis or the transverse axis of transit, utilize plane mirror respectively two light pipes to be carried out autocollimatic, write down the reading of pitching scrambler and azimuth encoder; The scrambler angle difference of observing twice aligning departs from the situation of 180 degree; If the deviation value that records of scrambler is 180 ° 3 ", and actual permissible variation according to transit overall accuracy allocation requirements is 5 ", showing that then the axial system error of transit, encoder errors meet the demands, the error source that influences measuring accuracy is an optical aiming system.If the deviation value that records of scrambler is 180 ° 3 "; and actual permissible variation according to transit overall accuracy allocation requirements is 1 "; Then show transit axial system error and encoder errors one of them do not reach designing requirement or in use change, the error source that influences measuring accuracy is the axle system or the scrambler of transit.

In addition, when certain model ballistic camera is always examined, find that precision index is overproof; Be difficult to judge that which subsystem is out of joint; Each subsystem all reexamines one time to waste time and energy, and has discharged axle system and scrambler soon through method of the present invention, and final the discovery is the fault of optical aiming system.

Claims

1. A method for discriminating the source of error of a goniometer, characterized in that the method may further comprise the steps:

Step 1: Use two 0.2" self-collimating light tubes to aim at each other to establish a baseline, and the error of the baseline is less than 1";

Step 2: Fix a plane reflector on the turntable of the goniometer;

Step 3: Turn the turntable of the goniometer, use the plane reflector to self-align the two 0.2" self-collimating light tubes, and record the readings of the goniometer encoder;

Step 4: Observe the deviation of the encoder readings of the two self-calibrating goniometers from 180°. If the measured deviation is within the allowable deviation according to the overall accuracy distribution requirements of the goniometer, it indicates that the shafting error, the encoder The error meets the requirements, and the error source that affects the measurement accuracy is the optical aiming system; if the measured deviation value is not within the allowable deviation according to the overall accuracy distribution requirements of the goniometer, it indicates that the error source that affects the measurement accuracy is the shafting or encoder; thus Complete the method for identifying sources of error in goniometric instruments.

2. The method for discriminating the error source of a goniometer according to claim 1, wherein the goniometer is a point diffraction interferometer or a theodolite or a ballistic camera.

3. the method for the source of error of discriminating goniometric instrument according to claim 1, is characterized in that, when described goniometric instrument is a theodolite, the fixed position of the plane reflector described in step 2 is on the theodolite four-way or horizontal On the shaft head, the turntable of the rotary goniometer described in step 3 is the vertical axis or horizontal axis of the rotary theodolite.