Interferometric Fiber Optic Doppler Velocimeter with High Dynamic Range
Patent application, filed 20 May 97
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
A fiber optic velocity sensor system for measuring the Doppler shift in the optical frequency of light reflected from a moving surface is disclosed. The velocity sensor system comprises a source of coherent light a sensor for directing the coherent light to a moving surface and collecting a Doppler-shifted return signal from the moving surface an unbalanced optical interferometer for changing the Doppler-shifted return light into an optical phase shift and a processor for converting the optical phase shift from the interferometer into a voltage signal proportional to the velocity of the moving surface. Other embodiments of the fiber optic Doppler velocity sensor system of the invention include an embodiment with enhanced dynamic range, an embodiment with selectable responsivity, and an embodiment with multiple optical pickup heads.
- Lasers and Masers
- Fiber Optics and Integrated Optics