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Single mirror panoramic digital speckle pattern interferometer
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DOI：10.1088/2631-8695/ae22c4.png)
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Abstract
En 中文
We present a panoramic speckle interferometer designed to measure micro-displacements on the inner surfaces of cylindrical objects across a full 360 degrees field of view. The system employs a single parabolic mirror to expand the optical field and enable comprehensive displacement analysis within cylindrical structures. Speckle fringe patterns are generated in response to mechanical state changes and recorded in real-time, capturing displacements along the X, Y, and Z axes. The relationship between induced displacement and fringe formation was established through prior characterization of a piezoelectric actuator, ensuring that each applied voltage corresponded to a known physical displacement. A synthetic speckle generation algorithm was also implemented using a deterministic geometric model of the optical system. Experimental results confirm the system's ability to detect micro-displacements from 473 nm to 4.1 mu m. Simulated fringe patterns closely matched the experimental ones, validating the accuracy of the geometric model and demonstrating the system's potential as a compact and effective tool for panoramic interferometric metrology.
Keywords:
speckle
fringes
displacements
real-time
correlated
induced
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