Biomedical Engineering Reference
In-Depth Information
Fig. 5.11
(
a
) Schematic of a typical fiber optics-based time-domain OCT setup, (
b
) reflectivity
profile of target position in the ocular medium, (
c
) detected interference signal by the photodetector,
(
d
) detected signal with reference signal filtered out, and (
e
) demodulated and envelop detected
OCT signal
Figure
5.11
b shows the relative target positions in the eye, and Fig.
5.11
cshows
the raw interferograms (A-scan) which are obtained by scanning the reference arm
mirror and correspond to the different structural features of the ocular medium.
Figure
5.11
d shows the reference arm signal-subtracted interference signal from
the output of the balanced detector. In the preceding step, the interferograms are
amplified and backed up with a band-pass filter tuned to the Doppler frequency,
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