Abstract:
A gas sensor (100,200) includes at least one sensor device including a surface acoustic wave (SAW) device (110) or a quartz crystal microbalance (QCM) device (210), and a layer of metal organic framework (MOF) material (120,220) disposed on each of the at least one sensor device. The at least one sensor device is structured to sense a change in mass of the MOF material.
Abstract:
Die Erfindung betrifft ein Verfahren zum Überwachen eines Zustands einer Kolbendichtung (104) eines Zylinders (100), wobei in einem Schritt des Durchführens ein Vergleich zwischen einem in den Zylinder (100) eingekoppelten Schwingungssignal (120) und einem aus dem Zylinder (100) ausgekoppelten, an der Kolbendichtung (104) reflektierten Reflexionssignal (124) des Schwingungssignals (120) und/oder einem aus dem Zylinder (100) ausgekoppelten, an der Kolbendichtung (104) vorbei transmittierten Transmissionssignal (126) des Schwingungssignals (120) durchgeführt wird, und in einem Schritt des Ermittelns ein den Zustand repräsentierender Zustandswert (136) unter Verwendung eines Ergebnisses (138) des Vergleichsermittelt wird.
Abstract:
Die vorliegende Erfindung betrifft insbesondere ein Verfahren zur Bestimmung von physikalischen, chemischen und/oder biologischen Eigenschaften eines Mediums (M), bei dem mittels eines Empfängers (SE2, SE3) eines ersten und zweiten Sender-Empfänger-Paares (SE1, SE2; SE1, SE3) Oberflächenwellen (OW1, OW2, OW3) empfangen werden, die zumindest teilweise auf eine erste oder zweite akustische Welle (VW1, VW2,...) zurückgehen, welche durch sich an der Mantelfläche (11, 12, 21, 22) eines Leitelements (R) ausbreitende akustische Oberflächenwellen (OW1, OW2, OW3) angeregt wird, sich im Medium (M) ausbreitet und zumindest teilweise wieder als Oberflächenwelle (OW1, OW2, OW3) in die Mantelfläche (11, 12, 21,22) des Leitelements, z.B. eines Rohres (R) oder Rohrsegments, einkoppelt. Erfindungsgemäß ist vorgesehen, dass - von einem Sender (SE1) des ersten Sender-Empfänger-Paares (SE1, SE2) Oberflächenwellen (OW1, OW2) angeregt werden, deren Ausbreitungsrichtung parallel zu einer Längserstreckungsrichtung (z) des Leitelements (R) verläuft, und - von einem Sender (SE1) des zweiten Sender-Empfänger-Paare (SE1, SE3) Oberflächenwellen (OW3) angeregt werden, deren Ausbreitungsrichtung auf einen definierten Winkel α zur Längserstreckungsrichtung (z) des Leitelements (R) eingestellt ist, mit 0°
Abstract:
A device for testing a test material for defects within the test material has an acoustic broadband transducer offset from the test material surface during testing by a distance so that the transducer acquires acoustic waves across an air gap from the test material, wherein the acoustic waves arise from impact of an impact member on the test material.
Abstract:
Methods are provided for identifying a cementation status of a multi-string cased wellbore utilizing sonic tools with monopole and/or dipole transmitters and with an array of sonic receivers axially displaced from the transmitter(s). The sonic tool is used to record waveforms. The waveforms are then processed to generate slowness and/or attenuation dispersions. The slowness and/or attenuation dispersions are projected onto a slowness and/or attenuation axis, and the results are compared to a data set of projected slowness and/or attenuation dispersions representing a plurality of different multi-string cased wellbore cement status scenarios in order to select the scenario most closely associated with the results. The presence or lack of eccentering of a casing is similarly obtained where the data set includes projected dispersions representing properly centered and eccentered casings.
Abstract:
An acoustic device is described for inspection of an object. The device comprises an ultrasonic source comprising a snap-through buckling actuator (2). The device may be used for non-destructive testing of objects. The device may be carried by a platform, such as a coordinate measuring machine, to allow inspection of objects or it may be embedded within an object for life cycle monitoring purposes.
Abstract:
The present application relates to systems for detection of partial discharges in a power transformer. In embodiments, the systems utilize fiber optic acoustic sensors to monitor the pressure waves associated with partial discharges and localize the discharges using appropriate measurement and analysis software. The present application provides systems and methods that meet the needs identified above. In embodiments, systems for detection of a partial discharge in a power transformer are provided.
Abstract:
A gas turbine engine includes an inner shaft extending axially along the gas turbine engine, a plurality of disks extending radially inwardly and toward the inner shaft, at least one hole in at least one of the plurality of disks, and an obstruction positioned between the inner shaft and an end of the disk having the at least one hole, such that a bore flow that flows along an axial length of the inner shaft is obstructed from flowing along the shaft by the obstruction, and forced to flow radially outward from the obstruction, through the at least one hole, and radially inward toward the inner shaft.
Abstract:
A method and system to map density and temperature of a chip, in situ, is disclosed. The method includes measuring a propagation time that a mechanical propagation wave (100) travels along at least one predefined path (12, 14) in a substrate (10). The method further includes calculating an average substrate density and temperature along the at least one predefined path as a function of the propagation time and distance. The method further includes determining a defect or unauthorized modification (18) in the substrate based on the average substrate density being different than a baseline substrate density.