CERES > School of Engineering (SoE) > Staff publications - School of Engineering >

Please use this identifier to cite or link to this item: http://dspace.lib.cranfield.ac.uk/handle/1826/7403

Document Type: Conference paper
Title: Optical coherence tomography with a Fizeau interferometer configuration
Authors: Casaubieilh, P.
Ford, Helen D.
James, Stephen W.
Tatam, Ralph P.
Issue Date: 2005
Citation: P. Casaubieilh, H. D. Ford, S. W. James and R. P. Tatam. Optical coherence tomography with a Fizeau interferometer configuration. Proceedings of the SPIE Nano- and Micro-Metrology, 16-17 June 2005, Munich, Germany. Volume 5858, 58580I. Eds. Heidi Ottevaere, Peter DeWolf, Diederik S. Wiersma
Abstract: We report the investigation of a Fizeau interferometer-based OCT system. A secondary processing interferometer is necessary in this configuration, to compensate the optical path difference formed in the Fizeau interferometer between the end of the fibre and the sample. The Fizeau configuration has the advantage of 'downlead insensitivity', which eliminates polarisation fading. An optical circulator is used in our system to route light efficiently from the source to the sample, and backscattered light from the sample and the fibre end through to the Mach-Zehnder processing interferometer. The choice of a Mach- Zehnder processing interferometer, from which both antiphase outputs are available, facilitates the incorporation of balanced detection, which often results in a large improvement in the Signal-to-Noise ratio (SNR) compared with the use of a single detector. Balanced detection comprises subtraction of the two antiphase interferometer outputs, implying that the signal amplitude is doubled and the noise is well reduced. It has been discerned that the SNR drops when the refractive index variation at a boundary is small. Several OCT images of samples (resin, resin + crystals, fibre composite) are presented.
URI: http://dx.doi.org/10.1117/12.612737
http://dspace.lib.cranfield.ac.uk/handle/1826/7403
Appears in Collections:Staff publications - School of Engineering

Files in This Item:

File Description SizeFormat
Optical_coherence_tomography-Fizeau-2005.pdf151.02 kBAdobe PDFView/Open

SFX Query

Items in CERES are protected by copyright, with all rights reserved, unless otherwise indicated.