Three-wavelength combination source for white-light interferometry

A three-wavelength combination source in white-light interferometry (WLI) is used to simplify the central fringe identification. It is found that, by using this technique, the minimum signal-to-noise ratio required by the system to identify the central fringe position can be reduced when compared wi...

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Bibliographic Details
Published in:IEEE photonics technology letters 1993-11, Vol.5 (11), p.1350-1352
Main Authors: Wang, D.N., Ning, Y.N., Grattan, K.T.V., Palmer, A.W., Weir, K.
Format: Article
Language:English
Subjects:
Coherence
Diode lasers
Exact sciences and technology
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Interference
Interferometers
Light sources
Metrology
Optical coupling
Optical instruments, equipment and techniques
Optical interferometry
Physics
Power generation
Signal to noise ratio
Stability
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Summary:A three-wavelength combination source in white-light interferometry (WLI) is used to simplify the central fringe identification. It is found that, by using this technique, the minimum signal-to-noise ratio required by the system to identify the central fringe position can be reduced when compared with the use of two-wavelength combination sources. This technique is simple and effective and has potential uses in coherence-multiplexed interferometric sensor systems.< >
ISSN:1041-1135
1941-0174
DOI:10.1109/68.250066