A method to determine a characteristic on a turbine shaft is provided. The method includes disposing a reflective/absorptive target comprising a plurality of markings in a geometric pattern on the component. A light emitting source will then be focused onto a predetermined starting position on the target. The plurality of markings will linearly traverse across the light emitting source from the predetermined starting position. The reflected/absorbed light pulses from the plurality of markings will be detected and recorded. From the timing of the recorded light pulses, the characteristic of the component is determined. The geometric pattern comprises at least two non-parallel lines and a third line including the predetermined position. A system to determine a characteristic on a turbine shaft as well as a method to determine the torsional deflection of a turbine shaft are also provided.

A welding system includes a first sensor associated with a welding helmet and configured to sense a parameter indicative of a position of a welding torch relative to the welding helmet. The travel speed sensing system also includes a processing system communicatively coupled to the first sensor and configured to determine a position of the welding torch relative to a workpiece based on the sensed first parameter.

A welding system includes a first sensor associated with a welding helmet and configured to sense a parameter indicative of a position of a welding torch relative to the welding helmet. The travel speed sensing system also includes a processing system communicatively coupled to the first sensor and configured to determine a position of the welding torch relative to a workpiece based on the sensed first parameter.

Aspects of the present disclosure include a rotational oscillation sensor, a method of detecting rotational oscillation of an object, and a rotational oscillation sensor unit. One embodiment of the rotational oscillation sensor may comprise a first plurality of parallel dipole line (PDL) sensor unit units. In some embodiments, each of the plurality of PDL sensor units may comprise a plurality of cylindrical diametric magnets (CDMs) mounted in parallel around a first open region, and a diamagnetic object in the first open region.

Aspects of the present disclosure include a rotational oscillation sensor, a method of detecting rotational oscillation of an object, and a rotational oscillation sensor unit. One embodiment of the rotational oscillation sensor may comprise a first plurality of parallel dipole line (PDL) sensor unit units. In some embodiments, each of the plurality of PDL sensor units may comprise a plurality of cylindrical diametric magnets (CDMs) mounted in parallel around a first open region, and a diamagnetic object in the first open region.

A modular pavement slab comprises a body, a strain sensor array, and a sensor processor. The body includes a top surface, a bottom surface, and four side surfaces. The modular pavement slab is configured to be coupled to at least one other modular pavement slab via connectors along at least one of the side surfaces. The strain sensor array is retained within the body and is configured to detect a plurality of strains on the body resulting from vehicular traffic across the top surface of the body. The sensor processor is in communication with the strain sensor array. The sensor processor is configured to communicate input signals to the strain sensor array, receive output signals from the strain sensor array, and determine a plurality of time-varying strain values, each strain value indicating a strain experienced over time by a successive one of a plurality of regions of the body.

A modular pavement slab comprises a body, a strain sensor array, and a sensor processor. The body includes a top surface, a bottom surface, and four side surfaces. The modular pavement slab is configured to be coupled to at least one other modular pavement slab via connectors along at least one of the side surfaces. The strain sensor array is retained within the body and is configured to detect a plurality of strains on the body resulting from vehicular traffic across the top surface of the body. The sensor processor is in communication with the strain sensor array. The sensor processor is configured to communicate input signals to the strain sensor array, receive output signals from the strain sensor array, and determine a plurality of time-varying strain values, each strain value indicating a strain experienced over time by a successive one of a plurality of regions of the body.

Disclosed is a photonic doppler velocimetry (PDV) system for ultra-high-speed instantaneous measurement, relating to laser velocity interferometry. The PDV system includes a laser velocity interferometry module, a microwave photonic module, and a data acquisition and signal processing module. The laser velocity interferometry module includes a continuous-wave laser, a circulator, a fiber optic probe, and a first photodetector. The microwave photonic module includes a femtosecond-pulse laser, a first dispersion optical fiber, a second dispersion optical fiber, a Mach-Zehnder (M-Z) modulator, and an optical fiber amplifier. The data acquisition and signal processing module includes a second photodetector, an oscilloscope, and a computer.

A measurement system for assisting in guiding an elongated medical device in a body is described. The measurement system comprises a multicore fiber for insertion into an elongated medical device such that a position of the tip of the multicore fiber corresponds with a position near the tip of the elongated medical device, the multicore fiber comprising a plurality of cores, and a measurement device being adapted for determining, based on the optical signals measured from the multicore fiber, a known shape applied to the multicore fiber, and for deriving based thereon, a length of the portion of the multicore fiber that has been introduced in the body or a position of the multicore fiber in the body.

A measurement system for assisting in guiding an elongated medical device in a body is described. The measurement system comprises a multicore fiber for insertion into an elongated medical device such that a position of the tip of the multicore fiber corresponds with a position near the tip of the elongated medical device, the multicore fiber comprising a plurality of cores, and a measurement device being adapted for determining, based on the optical signals measured from the multicore fiber, a known shape applied to the multicore fiber, and for deriving based thereon, a length of the portion of the multicore fiber that has been introduced in the body or a position of the multicore fiber in the body.