Abstract: Distributed fiber optic sensor includes a composite support tube that closely matches the coefficient of thermal expansion of the optical sensing fiber contained therewithin for applications including but not limited to Rayleigh back-scattering, (OFDR, Optical Frequency Domain Reflectometry), Brillouin frequency shift (BOTDA, Brillouin Optical Time Domain Analysis, BOTDR, Brillouin Optical Time Domain Reflectometry), Raman (Optical Time Domain Reflectometry), DPP-BOTDA (Differential Pulse Pair Brillouin Optical Time Domain Analysis), Dual-Index BOTDA, PCF (Photonic Crystalline Fibers), and dense packed Fiber Bragg Gratings, both time and wave length modulated are described in detail.

Abstract: A method for monitoring the operating conditions of an electric generator for mechanical strain and temperature includes means of distributive fiber optic sensors based on both Rayleigh back scattering techniques and Brillouin frequency shift fiber optic sensor analysis as both Rayleigh and Brillouin scans and allow accurate strain and temperature determinations at all points along standard fiber optic cables of considerable length, which effectively yields thousands of sensors throughout the entire standard fiber optic cable. Raman distributive temperature sensing also has a limited application. Single mode and polarizing maintaining fibers can both be analyzed and read with any Rayleigh or Brillouin distributive fiber optic sensor laser system allowing great flexibility in sensor spatial resolution, total sensed length, resolution and other factors.

Abstract: Distributed fiber optic sensor includes a composite support tube that closely matches the coefficient of thermal expansion of the optical sensing fiber contained therewithin for applications including but not limited to Rayleigh back-scattering, (OFDR, Optical Frequency Domain Reflectometry), Brillouin frequency shift (BOTDA, Brillouin Optical Time Domain Analysis, BOTDR, Brillouin Optical Time Domain Reflectometry), Raman (Optical Time Domain Reflectometry), DPP-BOTDA (Differential Pulse Pair Brillouin Optical Time Domain Analysis), Dual-Index BOTDA, PCF (Photonic Crystalline Fibers), and dense packed Fiber Bragg Gratings, both time and wave length modulated are described in detail.

Abstract: A method for monitoring the operating conditions of an electric generator including the entire stator core and all winding components for conditions of mechanical strain and temperature throughout the machine by means of distributive fiber optic sensors based on both Rayleigh back scattering techniques and Brillouin frequency shift fiber optic sensor analysis both of which do not have the gaps and limitations associated with standard fiber Bragg grating fiber optic point sensors, by virtue of the fact that both Rayleigh and Brillouin scans and allow accurate strain and temperature determinations at all points along standard fiber optic cables of considerable length, approximately two kilometers in the case of the Brillouin, which effectively yields many tens of thousands of sensors throughout the entire standard fiber optic cable. Raman distributive temperature sensing also has a limited application.

Abstract: A machine (10) that can clean and spray coat the inside of a hollow pipe (14) can contain a support bar (16) and associated motors (6 and 8) with a moveable carriage (12) which mounts a thermal spray coating device (28) and/or an abrasion cleaning/profiling head (30) where a programmable controller external to the pipe is capable of controlling the motors (6 and 8).

Abstract: A machine (10) that can clean and spray coat the inside of a hollow pipe (14) can contain a support bar (16) and associated motors (6 and 8) with a moveable carriage (12) which mounts a thermal spray coating device (28) and/or an abrasion cleaning/profiling head (30) where a programmable controller external to the pipe is capable of controlling the motors (6 and 8).

Abstract: A process for repairing leaks in turbine generators that have water cooled stator coils with hollow conductor strands, wherein the lead ends of the conductor strands are joined to a header. First a vacuum enclosure is provided around a portion of one of the stator coils in proximity to the header. Then a vacuum is applied to the portion. Finally, a resin is injected into voids in the portion. In a second embodiment, the header first is cut into an outboard section, and into an inboard section that remains attached to the conductor strands. Then the exposed lead ends of the conductor strands and the attached inboard section are cleaned to remove oxidation. Next, a water-tight braze seal is applied over the lead ends of the conductor strands. Then the stator coil and the inboard section are joined to a new outboard section and a vacuum is subsequently applied to the inboard section. The resin is then injected into voids in the inboard section.