Method of decoding a spectrally modulated light signal
Patent 5400140 Issued on March 21, 1995. Estimated Expiration Date: 
June 10, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 10, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMethod and apparatus for sensing or determining one or more properties or the identity of a sample Wavelength multiplexed optical transducer with a swept wavelength optical source Method and apparatus for detecting and measuring a physical magnitude Fabry-perot optical sensing device for measuring a physical parameter Patent #: 5202939 InventorAssigneeApplicationNo. 260204 filed on 06/10/1994US Classes:356/482For distance or displacement measurementExaminersPrimary: Housel, James C.Assistant: Le, Long V. Attorney, Agent or FirmForeign Patent References
International ClassesG01L 013/02G01B 009/00 Foreign Application Priority Data1991-07-30 GBAbstractIn a method of analyzing a spectrally modulated light signal received from an interferometric transducer the value of an optical path difference associated with a parameter to be remotely sensed is encoded as a characteristic frequency of spectral modulation in the received light. The intensity of the received light is measured at a number of wavelengths within a selected range of wavelengths to obtain data defining a measured spectrum. Reference data is generated to represent a theoretical spectrum corresponding to a nominal optical path difference, the reference data being generated for a greater range of wavelengths than the selected range of wavelengths of the measured spectrum. The measured spectrum is correlated with successive portions of the reference data to identify a portion of the reference data exhibiting correlation with the measured spectrum, and an output signal is then generated which is representative of the location of the correlating portion within the wavelength range of the reference data. The method provides improved resolution for remote sensing of parameters such as pressure. | |
