Laser-based measurement scheme for rotational measurement of specularly reflective shafts

Steen Gruner Hanson; Bengt Hurup Hansen

doi:10.1117/12.191861

1 November 1994 Laser-based measurement scheme for rotational measurement of specularly reflective shafts

Steen Gruner Hanson, Bengt Hurup Hansen

Proceedings Volume 2292, Fiber Optic and Laser Sensors XII; (1994) https://doi.org/10.1117/12.191861
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

A novel method for measurement of rotational speed for reflective (machined or polished) shafts is presented. The method is based on Fourier transforming the scattered field from a single laser beam that illuminates the target. The detected intensity at two spatially separated positions in the Fourier plane will provide two signals, which, to a high degree, are identical except for a time delay. Tracking of the time delay for maximum covariance thus facilitates temporal probing of the instantaneous rotational speed and torsional vibrations. The method is insensitive to the shape and radius of the rotating shaft and to any additional translational motion. Further, the signal level is usually superior to the level in the existing method because direct reflection is detected. Mounting of retroreflective tape is, therefore, not required. A theoretical description is given with measurements based on using a delay-locked loop

Citation Download Citation

Steen Gruner Hanson and Bengt Hurup Hansen "Laser-based measurement scheme for rotational measurement of specularly reflective shafts", Proc. SPIE 2292, Fiber Optic and Laser Sensors XII, (1 November 1994); https://doi.org/10.1117/12.191861

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