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Proceedings Paper

Stationary low-coherence light-imaging and spectroscopy using a CCD camera
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Paper Abstract

We describe a new optical low-coherence reflectometer (interferometer) for depth profiling and lateral scanning without moving parts which can also be employed as a stationary FT-IR spectrometer. The reflectometer covers a range of 0.45 mm and 1 mm in the depth and lateral dimensions, respectively. The entire depth range is recorded simultaneously in one scan using a cooled 16-bit CCD camera; the lateral dimension is covered by scanning the probe beam sequentially across the sample with an acousto- optic deflector. The frequency shift generated by this deflector and an additional one placed in the reference arm creates an AC heterodyne signal with a frequency of 2kHz. Since the CCD camera cannot record the AC signal directly, a special readout scheme is employed. Stationary imaging was demonstrated using an artificial phantom. Using the same interferometer configured as a stationary FT-IR spectrometer, we measured the emission spectrum of a LED with a resolution of 0.74 nm at a central wavelength of 820 nm. We discuss the performance of the stationary CCD imaging system and compare it to that of a single-detector system employing moving parts.

Paper Details

Date Published: 19 May 1994
PDF: 12 pages
Proc. SPIE 2135, Advances in Laser and Light Spectroscopy to Diagnose Cancer and Other Diseases, (19 May 1994); doi: 10.1117/12.175998
Show Author Affiliations
Alexander R. Knuettel, National Institutes of Health (United States)
Joseph M. Schmitt, National Institutes of Health (United States)
M. Shay, National Institutes of Health (United States)
Jay R. Knutson, National Institutes of Health (United States)

Published in SPIE Proceedings Vol. 2135:
Advances in Laser and Light Spectroscopy to Diagnose Cancer and Other Diseases
Robert R. Alfano, Editor(s)

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