Abstract:
A conduit pressure sensor system and a process for non-intrusively determining the pressure within a conduit. In one example, the sensor system has a base section having an external surface and an internal region in fluid connection with the conduit. A strain sensor and a temperature sensor are positioned adjacent to the external surface of the base section.
Abstract:
A Bourdon tube pressure gauge is mounted for sensing the pressure of a system. The Bourdon tube is connected to at least one optical strain sensor mounted to be strained by movement of the Bourdon tube such that when the Bourdon tube is exposed to the pressure of the system, movement of the tube in response to system pressure causes a strain in the optical sensor. The optical sensor is responsive to the strain and to an input optical signal for providing a strain optical signal which is directly proportional to the pressure. A reference or temperature compensation optical sensor is isolated from the strain associated with the pressure of the system and is responsive to temperature of the system for causing a temperature-induced strain. The reference optical sensor is responsive to the temperature induced strain and the input optical signal for providing a temperature optical signal which is directly proportional to the temperature of the system. The temperature optical signal is provided for temperature compensation of the strain optical signal. The optical sensors include an optical fiber having intrinsic Bragg grating sensors formed in the optical fiber. The optical fiber is attached to a reference point and to the Bourdon tube such that changes in the position of the tube changes the strain on the optical fiber resulting in a wavelength shift of light reflected by the Bragg grating. The magnitude of the wavelength shift is directly proportional to a change in pressure.
Abstract:
Die Erfindung betrifft ein Verfahren und eine Einrichtung zur Bestimmung des Drucks (1) eines in einer Rohrleitung (2) angeordneten Fluids (3), wobei in einem Deformationsschritt (101) die Rohrleitung (2) durch den Druck (1) deformiert wird, in mindestens einem Erfassungsschritt (102a; 102b; 102c; 102d) jeweils ein Bereich (4a; 4b; 4c; 4d) der Außenseite der Rohrleitung (2) optisch durch jeweils eine Digitalkamera (6a; 6b; 6c; 6d) erfasst wird, in mindestens einem Analyseschritt (103a; 103b; 103c; 3d) jeweils eine optische Dehnungsanalyse eines erfassten Bereichs (4a; 4b; 4c; 4d) durchgeführt wird, und in einem Berechnungsschritt (104) aus der mindestens einen optischen Dehnungsanalyse der Druck (1) des Fluids (3) errechnet wird. Die Erfindung betrifft ebenfalls eine entsprechende Druckmessvorrichtung (13).
Abstract:
An electronic bourdon tube pressure gauge is disclosed, in which a pressure value indcated by an indicating needle of a bourdon tube pressure gauge is outputted as an electrical signal for the use in other devices. In a bourdon pressure gauge formed of a bourdon tube (110) that is formed in a spiral shape and is expanded by pressure applied thereto; a variation gear (120) for converting a variation of the bourdon tube (110) into a rotational movement; and a needle shaft gear (140) that has an indicating needle (130) for indicating scales (150), there is further provided a tube detection unit for converting a variation of a bourdon tube (110) based on a change in pressure value into an electrical pressure signal and outputting the same.
Abstract:
A residual pressure sensor for ascertaining a zero residual pressure, and an apparatus for monitoring the sensor for failure thereof. In order to detect a residual pressure reduced to zero, the condition of variation of an output from a residual pressure sensor is detected. This residual pressure sensor is not allowed to generate an output representative of zero residual pressure while the first-mentioned output varies. The energizing condition of a driving solenoid (21) for a solenoid valve which is adapted to open and close a pressure supply passage is monitored by using a current sensor (21) of a fail-safe structure adapted to detect the presence of a current and output a logical value 0, and detect the absence of a current and output a logical value 1, and the residual sensor is monitored for failure based on the monitor output condition of the current sensor and the output condition of the residual pressure sensor.
Abstract:
A system and method are provided for determining wall thickness of a structure such as a metallic pressurized pipe. The system includes an optical fiber having a plurality of Fiber Bragg Gratings (FBGs), and a mounting for securing the FBGs over discrete portions of the exterior surface of the pipe such that strain in the pressurized pipe wall is transmitted to the FBGs. The system further includes a light source and a light sensor coupled to an end of the optical fiber. The light sensor converts light reflected back from the FBGs into electrical signals that a digital processor converts into strain measurements. The FBGs are mounted around portions of the pipe expected to have significant metal loss as well as portions of the pipe expected to have negligible metal loss. The method includes at least one of comparing relative strains at locations with negligible metal loss to those with significant metal loss to accurately determine the thickness of the wall with metal loss; compensating for temperature effects by considering relative strains at areas of the pipe with and without metal loss; and measuring axial strain on the pipe with one or more of the FBGs to correct for at least one of bending and torsion effects on hoop strain.
Abstract:
A sensor (1) to determine the pressure in a milk transport system of an installation for milking animals, more particularly to determine to what extent a vacuum is present in the milk transport system. The sensor is provided with a first space (4), bounded by one first wall (2), which, in use, is in open communication with the milk transport system or is part of the milk transport system. The sensor is further provided with a first electrode (8) which is mechanically in contact with the first wall, a second electrode (12) and an electronic measuring circuit (16) for measuring a parameter which depends at least on the capacity formed by the first and the second electrode. The sensor is designed such that a distance between the first and second electrode varies as a function of a difference in pressure between the first space and the second space so that the parameter is a measure of the pressure prevailing in the first space relative to the pressure prevailing in the second space.
Abstract:
Die Erfindung betrifft eine Druckmessvorrichtung (1) zur Druckmessung in einem biologischen System mit einem biegeflexibel oder biegeelastisch ausgestalteten Messzellenträger (3), wobei in dem Messzellenträger (3) mindestens zwei zueinander beabstandet angeordnete FBG-Sensoren (4) vorliegen. Der Messzellenträger (3) kann mehrere Schichten (5, 6) aufweisen, in die die FBG-Sensoren (4) integriert sein können.
Abstract:
Dynamic sensors for sensing and adaptively controlling various events, operations and/or conditions in various systems including combustion engines and thermochemical regeneration systems are disclosed. A dynamic sensor includes one or more transducer components for detecting conditions and events and generating detected signals, a controller for receiving and processing detected signals to generate an output signal for controlling one or more conditions, a transceiver component that can be controlled using radio frequency, acoustic or other means, and that can report the output signal continuously, periodically or when interrogated, a memory for storing instructions, calibration data and/or measured data, and an energy harvester component that harvests energy from events to power one or more components of the dynamic sensor.