Buesse Wolter Sanks & Maire
Coherence gated doppler motion sensor and medical applications
A motion sensor applicable to medical procedures includes a source of light with a wavelength bandwidth and an optical detector. A first optical coupler terminates in a first probe tip and couples the light into the first probe tip. A second optical coupler terminates in a second probe tip and directs onto the detector scattered light returning through the second probe tip. A presentation device outputs a signal that indicates motion in a target volume of a sample in a vicinity of the probe tips based on a Doppler shift of the scattered light. The volume depends on coherence distance determined by the bandwidth. In variations, the first and second tips are the same tip, a multimode fiber is included, the bandwidth is between 0.1% and 5% of a center wavelength, or the presentation device is a speaker, or some combination.
University of Maryland, Baltimore University of Maryland, College Park St. Jude Medical The United States of America as represented by the Department of Veterans Affairs
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Chia-Pin Yu Cha-Min Joseph Ashraf Nicholas
Liang Chen Tang Schmitt Fouad Woolsey