| BMEG400C/591C
OCT Signal Processing I
| BMEG400C/591C
Experiment System
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L &M:Les&Mirror
FC : Fiber collimator
PC : Polarization controller
GS : Galvanometer scanner
DCP : Dispersion compensation prism
Swept Source
Calibration Interferometer
Balanced + Photo-
Detector −
| BMEG400C/591C
Dual Balanced Interference Signals – Fringe
| BMEG400C/591C
Dual Balanced Interference Signals – FFT
| BMEG400C/591C
Hilbert Transform
• The Hilbert transform facilitates the formation of the analytic signal.
• The toolbox function hilbert computes the Hilbert transform for a real input sequence x and returns a
complex result of the same length, y = hilbert(x), where the real part of y is the original real data and the imaginary part is the actual Hilbert transform. y is sometimes called the analytic signal, in reference to the continuous-time analytic signal.
• The Hilbert transform is related to the actual data by a 90-degree phase shift; sines become cosines and vice versa.
| BMEG400C/591C
Resampling Process
| BMEG400C/591C
Binary Windowing Processing
| BMEG400C/591C
Non-linear Phase Slope
| BMEG400C/591C
Before vs After Resampling
| BMEG400C/591C
Resampling Results
| BMEG400C/591C
Depth Index → Depth Position
| BMEG400C/591C
Spectral Shift – Fringes
| BMEG400C/591C
Spectral Shift – FFT Signals
| BMEG400C/591C
Complex Conjugate Multiplication
| BMEG400C/591C
Spectral Shift Compensation Process
| BMEG400C/591C
Spectrum Shift Compensation Results
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