Abstract: When implementing a PMU network, creation of synchrophasors is achieved by centralising the determining of phasors and corresponding time-stamps at a location away from the actual measurement locations. Alternatively, or in addition to time-stamping phasors, time-stamping of any received signals and/or measurements derived from those signals is enabled. These signals are received from appropriate sensors distributed along optical fibres such as may be incorporated in modern power cables. Likewise, control signals can be communicated along optical fibres such as may be incorporated in modern power cables, and a number of approaches to ensuring control signals are received by the intended control modules are provided. Either or both the PMU network and control system can be implemented in a power network by exploiting existing optical fibre infrastructure in this way, and control signals can be transmitted dependent on analysis performed on synchrophasors.

Abstract: The invention enables the measurement of the voltage between phases (phase-to-phase voltages) of a multi-phase power cable, e.g. a three-phase power cable, such as may be used in subsea or subterranean environments for electrical power transfer. The invention does not require a power supply at the measurement location, and relies solely on optical fibres (typically present in such cables) to carry light to and from the sensors. Fibre Bragg grating (FBG) based sensors sample the electric field between conductors and convert to a strain on the fibre, as a result of which certain wavelengths of the reflected light are modulated by the instantaneous magnitude of the phase-to-phase voltages to be measured. A sensor module embodying the invention includes a spacer which holds the conductors in a predetermined geometry and locates the FBG sensors between pairs of conductors on which the phase-to-phase voltage measurements are to be performed.

Abstract: The invention enables the complexity and cost of implementing a PMU network and/or a control system to be substantially reduced by eliminating the requirement for power supplies, GPS equipment, and telecommunication equipment at each measurement and/or control location. In the case of implementing a PMU network, creation of synchrophasors is achieved by centralising the determining of phasors and corresponding time-stamps at a location away from the actual measurement locations. Alternatively, or in addition to time-stamping phasors, the invention enables the time-stamping of any received signals and/or measurements derived from those signals. These signals are received from appropriate sensors distributed along optical fibres such as may be incorporated in modern power cables. Likewise, control signals can be communicated along optical fibres such as may be incorporated in modern power cables, and a number of approaches to ensuring control signals are received by the intended control modules are provided.

Abstract: The invention enables the measurement of the voltage between phases (phase-to-phase voltages) of a multi-phase power cable, e.g. a three-phase power cable, such as may be used in subsea or subterranean environments for electrical power transfer. The invention does not require a power supply at the measurement location, and relies solely on optical fibres (typically present in such cables) to carry light to and from the sensors. Fibre Bragg grating (FBG) based sensors sample the electric field between conductors and convert to a strain on the fibre, as a result of which certain wavelengths of the reflected light are modulated by the instantaneous magnitude of the phase-to-phase voltages to be measured. A sensor module embodying the invention includes a spacer which holds the conductors in a predetermined geometry and locates the FBG sensors between pairs of conductors on which the phase-to-phase voltage measurements are to be performed.

Abstract: An aircraft fuselage (4) comprising: an aircraft door or access panel (2) comprising a receiving element (14); and locking apparatus for securing the aircraft door/panel (2) in an opening of aircraft fuselage (4), the locking apparatus comprising: a shaft (8); a mounting member (10) for mounting the shaft (8) to the fuselage (4); securing means (12) fixedly mounted to the shaft (8) and arranged such that rotation of the shaft (8) about its longitudinal axis moves the securing means (12) from being not coupled to a receiving element (14) to being coupled to a receiving element (14) or vice versa; a locking member (52) for coupling to the shaft (8) such that rotation of the shaft (8) causes movement of the locking member (52); and fixing means for fixedly attaching the locking member (52) to the aircraft fuselage (4) thereby preventing rotation of the shaft (8).

Abstract: Aspects of the present disclosure generally relate to sanitizing wipe that provides a visual indication that a sufficient amount of abrasive scrubbing has occurred for a given period of time to properly sterilize various medical devices and medical equipment including needless intravenous hub-and-port systems. The sanitizing wipe can change color when used to properly sanitize medical equipment. The sanitizing swab can comprise a plurality of layers of non-woven material (e.g., cotton) in addition to an indicating film disposed between two layers of non-woven material. The indicating film can comprise a polymeric film and a plurality of microencapsulated dyes incorporated into the polymeric film. The microencapsulated dyes can be adapted to burst upon sufficient force being applied thereto, and the bursting of the microencapsulated dyes can cause the sanitizing wipe to undergo a change in visual state (e.g., change color).

Abstract: A monitoring system for monitoring a plurality of fiber Bragg gratings in an optical fiber, each fiber Bragg grating being sensitive to a different wavelength of light. The system comprises a broadband source for illuminating the optical fiber; at least one optical interferometer; light feeding means for feeding to an input of the interferometer light reflected from the fiber Bragg gratings, and a processor for processing the output from the interferometer to determine the wavelength of the reflected light. The light feeding means comprise a wavelength division multiplexer operable to separate light received from the optical fiber into a plurality of wavelengths, each associated with one of the fiber Bragg gratings and/or a time division mulitplexer operable to separate light received from the optical fiber into in a time separated series.

Abstract: An aircraft fuselage (4) comprising: an aircraft door or access panel (2) comprising a receiving element (14); and locking apparatus for securing the aircraft door/panel (2) in an opening of aircraft fuselage (4), the locking apparatus comprising: a shaft (8); a mounting member (10) for mounting the shaft (8) to the fuselage (4); securing means (12) fixedly mounted to the shaft (8) and arranged such that rotation of the shaft (8) about its longitudinal axis moves the securing means (12) from being not coupled to a receiving element (14) to being coupled to a receiving element (14) or vice versa; a locking member (52) for coupling to the shaft (8) such that rotation of the shaft (8) causes movement of the locking member (52); and fixing means for fixedly attaching the locking member (52) to the aircraft fuselage (4) thereby preventing rotation of the shaft (8).

Abstract: A monitoring system for monitoring a plurality of fibre Bragg gratings in an optical fibre, each fibre Bragg grating being sensitive to a different wavelength of light. The system comprises a broadband source for illuminating the optical fibre; at least one optical interferometer; light feeding means for feeding to an input of the interferometer light reflected from the fibre Bragg gratings, and a processor for processing the output from the interferometer to determine the wavelength of the reflected light. The light feeding means comprise a wavelength division multiplexer operable to separate light received from the optical fibre into a plurality of wavelengths, each associated with one of the fibre Bragg gratings and/or a time division mulitplexer operable to separate light received from the optical fibre into in a time separated series.