University System of Maryland

The United States Government As Represented by the Department of Veterans Affairs

St. Jude Medical, Inc.

Chia-Pin Liang

Joseph M Schmitt

Yu Chen

Cha-Min Tang

Nicholas Woolsey

Ashraf Fouad

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.

Coherence gated doppler motion sensor and medical applications

Growing community of inventors

College Park, MD, United States of America

Chia-Pin Liang