Compressed data for temporal fringe analysis in interferometry

Tuck Wah Ng; Kar Tien Ang

doi:10.1117/12.557143

2 August 2004 Compressed data for temporal fringe analysis in interferometry

Tuck Wah Ng, Kar Tien Ang

Proceedings Volume 5531, Interferometry XII: Techniques and Analysis; (2004) https://doi.org/10.1117/12.557143
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

Temporal fringe pattern analysis is gaining prominence in interferometry; in particular for transient phenomena studies. This form of analysis, nevertheless, necessitates large data storage. Current compression schemes do not facilitate efficient data retrival and may even result in important data loss. Here, we describe a novel compression scheme that does not result in crucial data loss and allows the efficient retrieval of data for temporal fringe analysis. In sample tests using digital speckle inferometry or fringe patterns of a plate and of a cantilever beam subjected to temporal phase and load evolution respectively, a compression ratio of 1.6 was achieved without filtering out any data from discontinuous and low fringe modulation spatial points. By eliminating 38% of the data from discontinuous and low fringe modulation special points, a very significant compression ratio of 2.4 was attained.

Citation Download Citation

Tuck Wah Ng and Kar Tien Ang "Compressed data for temporal fringe analysis in interferometry", Proc. SPIE 5531, Interferometry XII: Techniques and Analysis, (2 August 2004); https://doi.org/10.1117/12.557143

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KEYWORDS

Fringe analysis

Modulation

Interferometry

Phase shift keying

Image compression

Data storage

Binary data

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