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Design and development of an oblique incidence interferometer Bajaj, Vijay Kumar
Abstract
Interferometry offers great scope in the study of surface topography and small surface displacements. The fundamentals of surface as encountered in engineering practice and a few of the optical methods available for the metrology of surface have been reviewed. In particular, Oblique Incidence Interferometry has been developed in detail for the study of relatively rough surfaces. The relationship between this method and the recent and more general method of holography has been explained. Some preliminary experiments were conducted to gain a feeling for the latter two methods and an oblique incidence interferometer was designed, constructed, and tested for its suitability for measuring industrial surfaces of approximately 22 inches in span from the following aspects: 1. The determination of surface topography of rough surfaces; 2. The measurement of small surface displacements; 3. The execution of forward scatter and back scatter holography for normal qualitative recording and subsequent comparison—holographic interferometry. A rough turned surface of a 12 inch diameter circular aluminium plate was examined. Small surface displacements of the same plate were measured and compared with theoretical predictions. Further holographic interferometry was performed on a turbine blade. Some of the difficulties encountered, such as the significance of diffraction effects at edges and marks on the surface and the determination of scale were studied and are discussed. Future studies on tubes and cylinders are discussed.
Item Metadata
Title |
Design and development of an oblique incidence interferometer
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1971
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Description |
Interferometry offers great scope in the study of surface topography and small surface displacements. The fundamentals of surface as encountered in engineering practice and a few of the optical methods available for the metrology of surface have been reviewed. In particular, Oblique Incidence Interferometry has been developed in detail for the study of relatively rough surfaces. The relationship between this method and the recent and more general method of holography has been explained.
Some preliminary experiments were conducted to gain a feeling for the latter two methods and an oblique incidence interferometer was designed, constructed, and tested for its suitability for measuring industrial surfaces of approximately 22 inches in span from the following aspects:
1. The determination of surface topography of rough surfaces;
2. The measurement of small surface displacements;
3. The execution of forward scatter and back scatter holography for normal qualitative recording and subsequent comparison—holographic interferometry.
A rough turned surface of a 12 inch diameter circular aluminium plate was examined. Small surface displacements of the same plate were measured and compared with theoretical predictions. Further holographic interferometry was performed on a turbine blade.
Some of the difficulties encountered, such as the significance of diffraction effects at edges and marks on the surface and the determination of scale were studied and are discussed. Future studies on tubes and cylinders are discussed.
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Genre | |
Type | |
Language |
eng
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Date Available |
2011-05-02
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0101898
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
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Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.