研究目的
To extend the measurement range of frequency-domain low coherence interferometry (FD-LCI) from 3 mm to 2 cm and to minimize the effects of fall-off.
研究成果
A system of two tandem interferometers was used, based on the FD-LCI technique, which allows the measurement of an OPD of several centimeters. The system allows the conventional measuring range of FD-OCT to be increased with very low cost, offering a good solution for industrial problems. At the same time, the tuning of the technique allows the measurement of a large OPD, minimizing the effects of the loss of intensity generated by the fall-off.
研究不足
The measurement of larger distances is difficult due to fall-off, and the accuracy of the system is the addition of the micrometric translator and FD-LCI accuracies. This error could be reduced with better quality displacement systems.
1：Experimental Design and Method Selection:
The setup uses a supercontinuum laser as the light source, limited to a bandwidth of 130 nm centered at 850 nm. An extra interferometer is added before the spectrometer in a typical FD-LCI setup.
2：Sample Selection and Data Sources:
Several samples were tested, including a coverslip, a transparent acrylic slide, and two slides separated by more than a centimeter.
3：List of Experimental Equipment and Materials:
Supercontinuum laser (NKT model SuperK Extreme IR), optical filter, circulator (PIOC-3-85-P-1-21-1 by AC Photonics), fiber-optic collimators (TC06APC-780 by Thorlabs), mirrors (PF10-03-P01 by Thorlabs), manual micrometric translator, spectrometer (Ocean Optics HR4000).
4：0). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The light is transmitted to a circulator, which acts as a one-arm fiber interferometer. Reflections are collected by the same optical fiber and carried to the heterodyne Michelson interferometer (HMI). Axial reflectivity profiles (A-scans) are obtained.
5：Data Analysis Methods:
Data are processed with Matlab using routines developed by the authors.
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Circulator
PIOC-3-85-P-1-21-1
AC Photonics
Acts as a one-arm fiber interferometer.
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Fiber-optic collimators
TC06APC-780
Thorlabs
Used to illuminate the sample.
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Mirrors
PF10-03-P01
Thorlabs
Used at the end of each arm in the heterodyne Michelson interferometer.
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Spectrometer
HR4000
Ocean Optics
Used for detection after the heterodyne Michelson interferometer.
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Supercontinuum laser
SuperK Extreme IR
NKT
Acts as the light source in the experimental setup.
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