Distributed and spatially averaged fiber optic temperature sensors and method using same
September 13, 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 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. 305252 filed on 09/13/1994US 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 AbstractMethods and devices for sensing temperature changes at a plurality of locations use a light-transmitting optical fiber system along a path including said locations, said optical fiber system having a first end and a second end and a sensing element of said locations, each sensing element being so characterized that, when exposed to the temperature changes to be sensed and transmitting interrogating light of suitable wavelength or wavelengths λv and an intensity Po, it converts a fraction Po of the intensity of said interrogating light into a light separable from the interrogating light, at least part of the intensity of which is emitted from at least one of said two ends of the probe at wavelengths λf different from λv, where is a temperature-dependent fraction smaller than unity, the value of which increases with increasing temperature within a temperature range, the intensity of said light of wavelengths λf being substantially proportional to the value of . The system can be used to sense the temperature distribution among the different locations, or to provide the spatially averaged temperature along the optical fiber system.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) | |
