Diaphragm-based fiber acoustic sensor
AssigneeThe Board of Trustees of the Leland Stanford Junior University
InventorsMichel J.F. Digonnet, Behrad Habib Afshar
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Abstract
A sensor includes at least one optical waveguide having a mode-field diameter greater than 11 μm and an optical reflector optically coupled to the at least one optical waveguide. The optical reflector includes a first substrate portion configured to reflect a first portion of a light beam back to the at least one optical waveguide and a diaphragm configured to reflect a second portion of the light beam back to the at least one optical waveguide. The diaphragm is responsive to a perturbation by moving relative to the first substrate portion. The light beam is centered on a region between the first substrate portion and the diaphragm.
Claims22
A sensor comprising:
- at least one optical waveguide configured to emit light in a direction, the at least one optical waveguide having a mode-field diameter greater than 11 μm;
- and
- an optical reflector optically coupled to the at least one optical waveguide, the optical reflector configured to reflect at least a portion of the light, the optical reflector comprising:
- a first portion of the optical reflector configured to reflect a first portion of the light back to the at least one optical waveguide;
- and
- a second portion of the optical reflector configured to reflect a second portion of the light back to the at least one optical waveguide, the second portion of the optical reflector responsive to a perturbation by moving relative to the first portion of the optical reflector, the reflected second portion of the light differing in phase from the reflected first portion of the light by a phase difference that is not substantially equal to an integer multiple of π when the second portion of the optical reflector is in an equilibrium position in absence of the perturbation.
A sensor comprising:
- at least one optical waveguide configured to emit a light beam;
- and
- an optical reflector optically coupled to the at least one optical waveguide, the optical reflector configured to be illuminated by the light beam and to reflect at least a portion of the light beam to the at least one optical waveguide, the optical reflector comprising:
- a first substrate portion configured to reflect a first portion of the light beam back to the at least one optical waveguide;
- and
- a diaphragm configured to reflect a second portion of the light beam back to the at least one optical waveguide, the diaphragm responsive to a perturbation by moving relative to the first substrate portion, the light beam centered on a region between the first substrate portion and the diaphragm.
Dependencies are inferred from the claim text.