Graduation Semester and Year

2006

Language

English

Document Type

Thesis

Degree Name

Master of Science in Biomedical Engineering

Department

Bioengineering

First Advisor

Digant Davè

Abstract

A fast spectrometer capable of operating at 27.8 KHz is designed and calibrated to work in the wavelength range of 700-900 nm, to perform Fourier Domain Optical Coherence Tomography (FD-OCT). The OCT system is based on fiber-based Michelson's interferometer set up utilizing the spectrometer at the detector end. In FD-OCT system no reference scanning is necessary and hence images can be acquired at a much faster rate without any penalty to signal-to-noise ratio (SNR). A broadband Ti- sapphire source is used as input to this interferometer. Data at the rate of 60 MHz is acquired from the spectrometer using a frame grabber and a DAQ card is used for synchronization and scanning of the galvanometers in the sample path. Lab-VIEW is used as interface for data collection and processing. The theoretical resolution of the spectrometer is calculated to be 0.11 nm resulting in the measurable depth range of 1.54 mm. Signal-to-noise for the system was experimentally found to be 52.05 dB. Video-rate OCT image acquisition capability of the FD-OCT system is demonstrated.

Disciplines

Biomedical Engineering and Bioengineering | Engineering

Comments

Degree granted by The University of Texas at Arlington

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