研究目的
To introduce a frequency pair model and implement an adjustment of a frequency filter for processing interference fringes of an APRIL-based interferometer.
研究成果
The frequency pair model, based on a simple but important relationship between the MPD point of fringe pattern and the MPD point of each frequency pair, was examined with optical experiments for the selection of the frequency filter. The proposed method provides a means to balance the filter center width and standard deviation of the phase cross point by iteratively computing an optimal filter.
研究不足
The study does not address the performance of the proposed method in terms of measurement range, dead zone, etc., of the original APRIL method.
1：Experimental Design and Method Selection:
The study uses a frequency pair model to select spectral components of the measured interferogram for regeneration of phase information.
2：Sample Selection and Data Sources:
The study uses a conventional Michelson interferometer for optical experiments, with a femtosecond optical frequency comb laser source.
3：List of Experimental Equipment and Materials:
The equipment includes a femtosecond optical frequency comb, optical fiber, collimator lens, beam splitter cube, photo detector, piezo actuator, mirrors, and an oscilloscope.
4：Experimental Procedures and Operational Workflow:
The position of the object mirror is fixed, and the reference mirror is shifted via a piezo actuator to generate interferometric patterns.
5：Data Analysis Methods:
The phases of the left and right components of the frequency pair are obtained, and the minimum phase difference point is identified.
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femtosecond optical frequency comb
Laser source for the interferometer
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optical fiber
Transmission of the laser beam
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collimator Lens
Collimation of the laser beam
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beam splitter cube
Splitting the laser beam
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photo detector
Detection of interferometric patterns
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Piezo actuator
Shifting the reference mirror
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mirrors
Reflection of the laser beam
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oscilloscope
Sampling the waveform
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