Distributed fiber optic temperature sensors and systems
March 11, 2016. 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 References 3456211 Optical analytical device, waveguide and method Optical fibre with enhanced security Fiber optic temperature sensor Fiber optic temperature sensor Fiber optic hot spot detector Optical temperature probe employing rare earth absorption Temperature sensing arrangement and method Optical fiber temperature sensor Fiber optic temperature sensing InventorApplicationNo. 613352 filed on 03/11/1996US Classes:385/123, OPTICAL FIBER WAVEGUIDE WITH CLADDING250/227.11, Light conductor250/227.14, Condition responsive light guide (e.g., light guide is physically affected by parameter sensed which results in light conveyed to the photocell)250/227.18, Causing light spectral frequency/wavelength change250/227.22, Keyboard or other manual switch controlled250/227.23, With spectral frequency/wavelength discrimination356/319, Utilizing a spectrophotometer (i.e., plural beam)356/320, Having plural wavelengths356/432, FOR LIGHT TRANSMISSION OR ABSORPTION356/445, OF LIGHT REFLECTION (E.G., GLASS)385/12, OPTICAL WAVEGUIDE SENSOR385/13, Including physical deformation or movement of waveguide385/126, Utilizing multiple core or cladding385/127ConcentricExaminersPrimary: Healy, BrianInternational ClassesG02B 006/02H04J 014/00 G01J 003/42 H01J 005/16 AbstractThe invention relates to fiber optic methods and devices for sensing physical parameters, like temperature or force, by converting a fraction of the intensity of the interrogating light into a positive signal with wavelengths and/or light propagation modes different from those of the interrogating light. Preferred embodiments make use of the redistribution of the intensity of the interrogating light between the core and a secong light-guiding region of an optical fiber probe, and the processing of the light carried by said second light-guiding region into a positive signal separable from the interrogating light.Field of SearchOPTICAL WAVEGUIDE SENSORIncluding physical deformation or movement of waveguide Particular coupling function Coupling between modes in a waveguide or fiber Mode strippers Evanescent wave coupling Input/output coupler Particular coupling structure End fire OPTICAL FIBER WAVEGUIDE WITH CLADDING Utilizing nonsolid core or cladding Utilizing multiple core or cladding Concentric MISCELLANEOUS HAVING PARTICULAR OPTICAL CHARACTERISTIC MODIFYING CHEMICAL COMPOSITION Light conductor Condition responsive light guide (e.g., light guide is physically affected by parameter sensed which results in light conveyed to the photocell) With detection of fiber microbend caused by parameter affecting fiber Causing light spectral frequency/wavelength change Keyboard or other manual switch controlled With spectral frequency/wavelength discrimination LUMINOPHOR IRRADIATION Methods OPTICAL FIBER LASER OPTICAL PYROMETERS With sample engaging rod or tube FOR OPTICAL FIBER OR WAVEGUIDE INSPECTION BY DISPERSED LIGHT SPECTROSCOPY With Raman type light scattering Utilizing a spectrophotometer (i.e., plural beam) Having plural wavelengths FOR LIGHT TRANSMISSION OR ABSORPTION OF LIGHT REFLECTION (E.G., GLASS) | |
