We report on a high-speed time-domain optical coherence tomography (TD-OCT) technology that is capable of imaging 10 fps with 2000 A-scan. A duplex scanning optical delay line that is driven by a 1-kHz sinusoidal wave function was implemented and characterized. The reference and sample arms in a Michelson interferometer were simultaneously scanned using two identical piezoelectric transducers (PZTs). We adopted a sinusoidal wave function with constant voltages as the input functions for the PZTs. A recalibration of the measurement depth was necessary for the sinusoidal wave function operation. A recalibration with a spatial transformation was performed on the A-scan. We achieved an A-scan speed of 6 m/s. To the best our knowledge, this is the highest speed achieved in conventional TD-OCT systems to date.
In this study, a duplex scanning optical delay line is implemented and characterized for optical coherence tomography. The reference and sample arms in Michelson interferometer are simultaneously scanned by use of two identical piezoelectric transducers (PZT). It is obtained that scanning range, thermal drift, repeatability, and axial scanning velocity of duplex optical scanning delay line are distinctly superior to those of single scanning optical delay line.