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ASME B89.4.19 2021

ASME B89.4.19 2021

$98.04

ASME B89.4.19 – 2021 – Performance Evaluation of Laser-Based Spherical Coordinate Measurement Systems

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ASME 2021
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This Standard establishes requirements and methods for the performance evaluation of laser-based spherical coordinate measurement systems, with a specific focus on laser trackers, and provides a basis for performance comparisons among such systems. Definitions, environmental requirements, and test methods are included with emphasis on point-to-point length measurements. The specified test methods are appropriate for the performance evaluation of a majority of such instruments and are not intended to replace more complete tests that may be required for special applications. Additional tests are included that evaluate the range measurement capability of laser trackers equipped with absolute distance meters (ADMs). This Standard focuses specifically on the use of laser trackers as industrial measurement tools rather than their use in surveying or geodesy.

PDF Catalog

PDF Pages PDF Title
4 CONTENTS
6 FOREWORD
7 ASME B89 COMMITTEE ROSTER
8 CORRESPONDENCE WITH THE B89 COMMITTEE
10 ASME B89.4.19-2021 SUMMARY OF CHANGES
12 1 SCOPE
2 INTRODUCTION
13 3 DEFINITIONS
15 4 SPECIFICATIONS AND RATED CONDITIONS
5 TEST ENVIRONMENT
6 PERFORMANCE EVALUATION TESTS
6.1 General Requirements
16 Forms
Form 4-1 Specifications of Rated and Limiting Operating Conditions
17 Form 4-2 Manufacturer’s Performance Specifications and Test Results
18 6.2 Length Measurement System Tests
Tables
Table 6.1-1 Laser Tracker Performance Evaluation Requirements
19 Table 6.2.1-1 Horizontal Length Measurement System
20 Table 6.2.1-2 Vertical Length Measurement System Test
21 Table 6.2.1-3 Right Diagonal Length Measurement System Test
22 Table 6.2.1-4 Left Diagonal Length Measurement System Test
23 6.3 Two-Face System Tests
24 6.4 Ranging Tests
Table 6.3.1-1 Two-Face System Test
25 Table 6.4.1-1 Ranging Test
28 Figures
Figure 6.4.4.1-1 Laser Tracker and Reference Interferometer Alignment
Figure 6.4.4.1-2 Cosine Error Versus Offset C From Reference Line
29 7 ANALYSIS OF PERFORMANCE EVALUATION TESTS
7.1 Evaluation of Length Measurement System Tests of Para. 6.2
7.2 Evaluation of Two-Face System Tests of Para. 6.3
7.3 Evaluation of Ranging Tests of Para. 6.4
30 Figure 7.1-1 Form 4-2 With Example Default Method Data
31 7.4 Examples of Failure to Satisfy MPE Requirements
Figure 7.3.1-1 Least-Squares Line Fit to 12 Short Reference Lengths
32 8 REFERENCES
33 Figure 7.4.2-1 Form 4-2 With Example Alternative Method Data
34 MANDATORY APPENDIX I REFERENCE LENGTH TRACEABILITY
I-1 GENERAL TRACEABILITY ISSUES
I-2 REFERENCE LENGTH TRACEABILITY
35 I-3 METROLOGICAL TERMINUS
36 NONMANDATORY APPENDICES
NONMANDATORY APPENDIX A TRACEABILITY OF SUBSEQUENT MEASUREMENTS
A-1 INTRODUCTION
A-2 METROLOGICAL TRACEABILITY EXAMPLE
37 Table A-2-1 Example Uncertainty Budget
38 NONMANDATORY APPENDIX B SPHERICALLY MOUNTED RETROREFLECTOR (SMR) TESTS
B-1 INTRODUCTION
B-2 DETERMINING CENTERING ERROR OF VERTEX OF SMR
39 Figure B-2.1-1 Microscope Schematic for Measuring Lateral Centering Error
Figure B-2.2-1 Setup for Measuring Radial Centering Error
40 B-3 DIHEDRAL-ANGLE ERRORS
41 Figure B-3-1 Beam Orientations That Minimize Effects of Dihedral Angle Errors
B-4 POLARIZATION EFFECTS
42 Figure B-3-2 Laser Path With Unintended Offset Between Incoming and Outgoing Beams
Figure B-3-3 Path of Laser Beam in Cube-Corner Retroreflector
Figure B-3-4 Top View of Laser Beam Path in Cube-Corner Retroreflector
43 Figure B-3-5 Top View of Cube Corner With Extended Lines of Intersection
Figure B-3-6 Laser Beams Superimposed on Top View of Dihedral Prism
Figure B-3-7 Encoder Runout Pattern
44 NONMANDATORY APPENDIX C REFRACTIVE INDEX OF AIR
C-1 INTRODUCTION
C-2 PHASE REFRACTIVE INDEX
C-3 GROUP REFRACTIVE INDEX
45 C-4 EQUATIONS FOR REFRACTIVE INDEX OF AIR
C-5 REFRACTIVE INDEX UNCERTAINTY AND DISPLACEMENT MEASUREMENTS
47 Figure C-5-1 Refractivity for Standard Dry Air
48 NONMANDATORY APPENDIX D REFERENCE LENGTHS FOR LASER TRACKER SYSTEM TESTS AND TEST VALUE UNCERTAINTY
D-1 INTRODUCTION
D-2 DECISION RULE FOR DECIDING CONFORMANCE WITH MPE SPECIFICATION
49 D-3 REFERENCE LENGTH REALIZED USING A CALIBRATED SCALE BAR
52 D-4 REFERENCE LENGTH REALIZED USING TARGET NESTS CALIBRATED USING AN IFM
55 D-5 REFERENCE LENGTH REALIZED USING TARGET NESTS CALIBRATED USING AN ADM
D-6 REALIZATION OF REFERENCE LENGTHS USING A LASER RAIL SYSTEM
56 Figure D-6-1 Schematic of Laser Rail System
57 Figure D-6.2-1 Illustrating the Origin of Abbé Errors
58 Figure D-6.2-2 Abbé Error Versus Carriage Angular Motion for Various Values of Abbé Offset
60 NONMANDATORY APPENDIX E EFFECT OF AIR TEMPERATURE ON LASER TRACKER MEASUREMENTS
E-1 INTRODUCTION
E-2 RADIAL AND TRANSVERSE ERRORS
63 Figure E-2.3-1 Change in Refractive Index Versus Transverse Distance, x
E-3 UNAMBIGUOUS ENVIRONMENTAL SPECIFICATIONS
64 Figure E-2.3-2 Angle of Laser Beam Versus Distance Traveled
Figure E-2.3-3 Transverse Displacement of Laser Beam Versus Distance Traveled
65 Figure E-2.3-4 Example of Fractional Error Versus Distance
66 NONMANDATORY APPENDIX F LASER TRACKER INTERIM TESTING
F-1 INTRODUCTION
F-2 ENVIRONMENTAL CONSIDERATIONS
F-3 FREQUENCY OF INTERIM TESTING
F-4 A BEST PRACTICE GUIDELINE
F-5 INTERIM TEST PROCEDURE
67 Figure F-5.1.2-1 Scale Bar With Three Nests for Interim Testing
68 Figure F-5.1.2-2 Five Test Positions to Perform the Interim Check of a Laser Tracker
69 Figure F-5.2.2-1ð21Þ Setup for Inclinometer Tests
71 F-6 REFERENCE

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