Research of optical coherence tomography microscope based on CCD detector
2008
The reference wave phase was modulated with a sinusoidal vibrating mirror attached to a Piezoelectric Transducer (PZT),
the integration was performed by a CCD, and the charge storage period of the CCD image sensor was one-quarter period
of the sinusoidal phase modulation. With the frequency- synchronous detection technique, four images (four frames of
interference pattern) were recorded during one period of the phase modulation. In order to obtain the optimum
modulation parameter, the values of amplitude and phase of the sinusoidal phase modulation were determined by
considering the measurement error caused by the additive noise contained in the detected values. The PZT oscillation
was controlled by a closed loop control system based on PID controller. An ideal discrete digital sine function at 50Hz
with adjustable amplitude was used to adjust the vibrating of PZT, and a digital phase shift techniques was used to adjust
vibrating phase of PZT so that the phase of the modulation could reach their optimum values. The CCD detector was
triggered with software at 200Hz. Based on work above a small coherent signal masked by the preponderant incoherent
background with a CCD detector was obtained.
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