研究目的
To present and analyze a system of two interferometers in tandem for Optical Coherence Tomography (OCT) that expands the measurement range beyond that of conventional single interferometer systems with a spectrometer as a detector.
研究成果
The tandem interferometer system based on FD-OCT technique is a feasible and low-cost method to extend the dynamic range of measurements beyond conventional limits and reduce the fall-off effect. It is particularly suitable for samples with large OPDs where variations are within the spectrometer's dynamic range.
研究不足
The technique is not recommended for measuring thin samples due to potential confusion between peaks and their aliasing. Additionally, the system requires an initial estimation of the OPD to be measured for proper tuning of the second interferometer's OPD.
1：Experimental Design and Method Selection:
The study utilizes a combined system of two interferometers in the frequency domain to expand the measurement range. Theoretical models for signal generation and analysis are employed.
2：Sample Selection and Data Sources:
Two types of glass plates (a cover slip and a slide) are used as samples to verify the system's performance.
3：List of Experimental Equipment and Materials:
A supercontinuum laser (NKT SuperK Extrem IR), an Ocean Optics HR 4000 spectrometer, and a Michelson interferometer setup are used.
4：Experimental Procedures and Operational Workflow:
Light reflected from the sample interfaces generates interference signals, which are detected by the spectrometer after passing through the tandem interferometer setup. The signal is processed using Matlab.
5：Data Analysis Methods:
The Fourier transform of the interference signal is analyzed to determine the optical path difference (OPD), with adjustments made to the second interferometer's OPD to extend the measurement range.
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