Demodulation method and apparatus for fiber optic sensors
AssigneeLuna Innovations Incorporated
InventorClark Davis Boyd
Life of this patent
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Abstract
An interferometric sensing arrangement includes an interferometric sensor having an optical path length that varies depending on one or more physical parameters to be measured using the interferometric sensor. One or more light sources are used to generate light at three or more predetermined different fixed wavelengths. In a preferred example embodiment, four fixed wavelength lasers are used to generate light at four predetermined different fixed wavelengths. An optical coupler couples the multiple wavelength light to the interferometric sensor, and a detector measures an amplitude response of an interferometric signal produced by the interferometric sensor. A controller determines the optical path length based on the measured amplitude response.
Claims33
A measuring method for use with an interferometric sensor, comprising:
- generating light at three or more predetermined different fixed wavelengths;
- providing the light at three or more predetermined different fixed wavelengths to the interferometric sensor;
- measuring an amplitude response of an interferometric signal produced by the interferometric sensor;
- and
- determining an optical path length associated with the interferometric sensor based on the measured amplitude response,
- wherein the optical path length varies depending on one or more physical parameters to be measured using the interferometric sensor.
An interferometric sensing arrangement, comprising an interferometric sensor associated with an optical path length that varies depending on one or more physical parameters to be measured using the interferometric sensor, comprising:
- one or more light sources arranged to generate light at three or more predetermined different fixed wavelengths;
- an optical coupler arranged to provide the light at three or more predetermined different fixed wavelengths to the interferometric sensor;
- a detector arranged to measure an amplitude response of an interferometric signal produced by the interferometric sensor;
- and
- a controller configured to determine the optical path length associated with the interferometric sensor based on the measured amplitude response.
Dependencies are inferred from the claim text.