Highly doped d-shaped fiberoptic probe for hydrophone applications
AssigneeDrexel University
InventorsMahmoud A. El-Sherif, Afshin S. Daryoush, Peter A. Lewin, Rupa Gopinath Minasamudram
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Abstract
The fiber optic probe detects changes in ultrasound pressure in an immersion medium such as a liquid, a gas, or a solid, where the system includes an optical fiber probe having a fiber of the probe has a highly doped (or regular) core with a diameter in the range 5 to 10 μm and a clad diameter equal to or more than 50 μm; and the optical fiber tip has been modified in a D-shaped (or V-shaped) structure where the clad material has been removed from one side of the cylindrical fiber to the surface of the fiber core; then, this modified region of the fiber is coated, with a very thin layer of a metallic material, ranging from 3 to 10 nm.
Claims8
A sensory system for detecting ultrasound pressure waves in an immersion medium, the system comprising;
- an optical fiber probe including a doped fiber core surrounded by a fiber cladding layer, wherein the optical fiber probe includes an end face coated with a layer of a metallic material;
- wherein immersing the end face in an immersion medium provides a contact with the immersion medium, wherein detecting a pressure in the immersion medium is based on interaction between evanescent electromagnetic fields that exist outside the optical fiber probe surface and ultrasound waves propagating in the immersion medium or solid;
- wherein the end face includes a tapered end wherein the fiber cladding that has been etched away or removed from one side of the optical fiber probe leaving a planar surface that forms a D-shaped fiber tip.
Dependencies are inferred from the claim text.