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Title: Numerical analysis of error sources associated with a laser interferometer used in the calibration of rotary tables
Author: Evans, M. E.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1993
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The main objective of the work was to investigate the measurement errors in an interferometer system which arise from manufacture or from the level of skill of the operator. A computer model using a ray-trace was used to simulate the use of the interferometer in calibrating a rotary table. This application of an angle measuring interferometer is currently being developed by Renishaw Transducer Systems, Ltd. as an extension to their existing product. The errors associated with this application have been investigated both in isolation and in combination. The theoretical results indicate that without compensation, errors an order of magnitude larger than the required accuracy of 0.1 '' may be introduced. However, the use of a pre-calibration cycle in conjunction with a compensating data processing routine can reduce the measurement errors to within 0.1 ''. Experimental data taken with the interferometer and a rotary table of known accuracy confirmed the order of magnitude and general form of the results. Data from the calibration of a rotary table showed that the errors from the table were much larger than those seen with the interferometer and accurate table alone. Other errors due to thermal effects on the interferometer components, and to the method of supporting the components were also investigated, by finite element analysis and experiment, respectively.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available