Abstract
We present a full-range complex spectral domain optical coherence tomography with an ultra-broadband light source based on sinusoidal modulation. For the sinusoidal modulation strategy, a lead zirconate titanate stack actuator is employed to achieve the sinusoidal vibration of a mirror and therefore to get a series of spectral interferogram with different phase delays. The purpose of this strategy is to get higher performance complex-conjugate artifact elimination. Bessel separation of the signal sequence at each wavelength of the spectrometer was used to reconstruct the real and imaginary components of interference fringes; however, the sinusoidal modulation method is independent of light source wavelength. The experimental results demonstrated that the method had an excellent performance in a complex-conjugate suppression of 50 dB for a full width at half maximum bandwidth of 236 nm, and it has better anti-artifact ability and more flexible range in phase shifting than the conventional wavelength-dependent phase-shifting method on a full-range complex spectral optical coherence tomography system. Furthermore, the effect of the hysteresis error of lead zirconate titanate actuators on the performance of complex-conjugate artifact elimination was investigated and the solution of lead zirconate titanate positioning performance for both conventional phase-shifting and sine-modulation methods was suggested.
Highlights
Optical coherence tomography (OCT)[1] is a rapid developed imaging technology in the past 20 years.[2]
In the last few years, the focus of new developments has shifted toward spectral domain optical coherence tomography (SD-OCT) and swept-source optical coherence tomography (SS-OCT) since it has been shown that these versions of OCT have huge advantages in terms of acquisition speed and sensitivity, as compared to time domain optical coherence
In SD-OCT, depth-resolved information is encoded in the frequency of the spectral density function recorded by a spectrometer and is retrieved by the Fourier transform.[6]
Summary
Optical coherence tomography (OCT)[1] is a rapid developed imaging technology in the past 20 years.[2]. In a conventional phase-shifting full-range complex spectral OCT system, the lead zirconate titanate (PZT) is generally used to drive the reference mirror by various fractions of wavelength of the light between each A-scan. They are three-phase, four-phase, and fivephase shifting methods. 200 mm is the lateral resolution of the developed OCT system which is possible to perform 2D OCT imaging, such as for non-destructive testing (NDT) of thermal barrier coatings and glass-fiber reinforced plastic (GFRP) materials Both the backscattered lights from the sample and the mirror travel back toward the beam splitter and are collected by a broadband CCD-based spectrometer (USB2000 + ; Ocean Optics, USA). The corresponding computation can be achieved only in few microseconds
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