Optics: measuring and testing – By light interference – Spectroscopy
Reexamination Certificate
2011-01-18
2011-01-18
Connolly, Patrick J (Department: 2877)
Optics: measuring and testing
By light interference
Spectroscopy
C356S479000, C356S497000
Reexamination Certificate
active
07872757
ABSTRACT:
Apparatus and method for increasing the sensitivity in the detection of optical coherence tomography and low coherence interferometry (“LCI”) signals by detecting a parallel set of spectral bands, each band being a unique combination of optical frequencies. The LCI broad bandwidth source is split into N spectral bands. The N spectral bands are individually detected and processed to provide an increase in the signal-to-noise ratio by a factor of N. Each spectral band is detected by a separate photo detector and amplified. For each spectral band the signal is band pass filtered around the signal band by analog electronics and digitized, or, alternatively, the signal may be digitized and band pass filtered in software. As a consequence, the shot noise contribution to the signal is reduced by a factor equal to the number of spectral bands. The signal remains the same. The reduction of the shot noise increases the dynamic range and sensitivity of the system.
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Bouma Brett Eugene
De Boer Johannes F.
Tearney Guillermo J.
Connolly Patrick J
Dorsey & Whitney LLP
The General Hospital Corporation
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