2019/08/30 by Vijayakumar Anand, Anand, Vijayakumar, Shanti Bhattacharya +3
Engineering · Medicine · Physics and Astronomy · #Advanced Fiber Optic Sensors #Advanced Optical Sensing Technologies #FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #Ocular and Laser Science Research #Optical Coherence Tomography Applications #Optics (physics.optics) #Surface Roughness and Optical Measurements
paper · pdf · doi:10.48550/arxiv.1909.02095
openalex publication_date 2019/08/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Speckle correlation based optical levers SC OptLev possess attractive\ncharacteristics suitable for sensing small changes in the angular orientations\nof surfaces. In this study, we propose and demonstrate a spatial multiplexing\ntechnique for improving the dynamic range of SC OptLev. When the surface is in\nits initial position, a synthetic speckle intensity pattern, larger than the\narea of the image sensor is created by transversely shifting the image sensor\nand recording different sections of a larger speckle pattern. Then, the\nacquired images are stitched together by a computer program into one relatively\nlarge synthetic speckle pattern. Following the calibration stage, the synthetic\nspeckle intensity pattern is used to sense changes in the surfaces angular\norientation. The surface is monitored in realtime by recording part of the\nspeckle pattern which lies within the sensor area. Next, the recorded speckle\npattern is a cross correlated with the synthetic speckle pattern in the\ncomputer. The resulting shift of the correlation peak indicates the angular\norientations of the reflective surface under test. This spatial multiplexing\ntechnique enables sensing changes in the angular orientation of the surface\nbeyond the limit imposed by the physical size of the image sensor.\n