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Single-beam heterodyne three-degree-of-freedom interferometric measurement method based on sparse sampling using a fiber array
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DOI：10.1016/j.optlastec.2026.116059.png)
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Abstract
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• A fiber-array sparse sampling scheme is developed for single-beam heterodyne three-degree-of-freedom interferometry. • A dual-frequency Gaussian beam interference model is coupled with four-circular-aperture integrated reception. • Signal formation under the finite-aperture integration effect is analyzed for multi-channel phase retrieval. • Beam waist, fiber spacing, and core diameter are linked to angular range, interference contrast, and angular noise. • Integrated prototype experiments validate the model-guided parameter design and three-degree-of-freedom measurement.
Keywords:
Fiber array
Sparse sampling
Single-beam heterodyne interferometer
Three-degree-of-freedom measurement
Heterodyne demodulation
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