Patent
Method and apparatus for the non-invasive measurement of pressure inside pipes using a fiber optic interferometer sensor
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TLDR
In this article, a method and apparatus for the non-invasive sensing of the pressure within a pipe (or other vessel) is disclosed, where an optical source produces a first light beam.Abstract:
A method and apparatus for the non-invasive sensing of the pressure within a pipe (or other vessel) is disclosed. An optical source produces a first light beam. This first light beam is split between a first (reference) and a second (measurement) optical fiber. The second optical fiber is associated with the pipe such that circumferential displacements in the pipe, due to changes in internal pressure, result in corresponding displacements in the length of the second optical fiber. Length changes in the optical fibers result in variations in the phase of the light emerging therefrom. The phase difference between the light beams emitted from the first and second optical fibers is then determined and related to changes in the internal pressure of the pipe.read more
Citations
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Fluid parameter measurement in pipes using acoustic pressures
TL;DR: In this article, a spatial array of acoustic pressure sensors (14, 16, 18) placed at predetermined axial locations x1,x2,x3 along the pipe is used to measure the speed of sound amix.
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Distributed sound speed measurements for multiphase flow measurement
Daniel L. Gysling,Mark R. Myers +1 more
TL;DR: In this article, a multiphase flow meter distributed system is described that is capable of measuring phase flow rates of a multi-phase fluid, which includes at least one flow meter disposed along the pipe, an additional sensor disposed along a pipe spatially removed from the flow meter, and a mult-phase flow model that receives flow related parameters from a flow meter and the additional sensor to calculate the phase flow rate.
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TL;DR: In this paper, an apparatus for non-intrusively sensing fluid flow within a pipe is provided, which includes a first sensing array for sensing acoustic signals traveling at the speed of sound through fluid flow in a pipe, a second sensing array to measure local pressure variations traveling with the fluid flow, and a housing attached to the pipe for enclosing the sensing arrays.
References
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Patent
Structural monitoring system using fiber optics
TL;DR: In this article, a preferred optic fiber construction comprises a core and cladding contained within a protective buffer coating, wherein the buffer coating includes a particulate material for engaging the cladding in a manner altering reflective or transmission or other "electro-optic signature" characteristics of the fiber when the buffer is subjected to radial forces.
Journal ArticleDOI
Fiber optic acoustic sensor
PatentDOI
Fiber-optic acoustic sensor
TL;DR: In this article, an optical fiber acoustical sensor for detecting sound waves in a fluid mum is presented, where a sound wave propagating through the fluid medium and incident on the optical fiber coil changes the index of refraction and the length of the optical fibre at the area of incidence.
Patent
Quadrature fiber-optic interferometer matrix
TL;DR: In this paper, the reference and signal waveguides are coupled to one another at two different points (38, 40) so that interference between the light in the waveguide occurs under two different phase conditions, with a phase difference between these conditions approaching pi/2 radians.
Patent
Fiber optic interferometer using two wavelengths or variable wavelength
TL;DR: In this paper, a fiber optic interferometric physical sensor is used with a transducer coupled to the sensor arm to measure the phase of light signals passing therethrough in response to a physical quantity, and the phase difference is adjusted such that the sensitivity of the two output components to the physical quantity are never simultaneously at a minimum.