PatentDOI
Planar and linear fiber optic acoustic sensors embedded in an elastomer material
TLDR
In this paper, a planar and linear fiber optic sensor system comprised of a sensor element and a reference element is presented. But the sensor and reference fibers are shaped circularly and uniformly, heat treated or bonded together and embedded in a spiral pattern within a low Bulk Modulus and Young's Modulus elastomer encapsulant.Abstract:
A interferometric planar and linear fiber optic sensor system comprised of a sensor element and a reference element. In the planar fiber optic sensor system the sensor and reference fibers are shaped in loops circularly and uniformly, heat treated or bonded together and embedded in a spiral pattern within a low Bulk Modulus and Young's Modulus elastomer encapsulant. The invention results in high and frequency independent sensitivity which minimizes acceleration effects. For the linear sensor, the sensing fiber is shaped in loops forming a linear chain which is embedded in an appropriate low bulk modulus elastomeric encapsulant. The reference fiber is shaped in loops around a cylindrical aluminum mandrel within which the input and output fiber cables and couplers are encapsulated in a high bulk modulus material epoxy resin. In both the planar and linear forms, the sensing and reference fiber may be of equal length, however, the reference fiber may be of a shorter length when a coherent light source is utilized.read more
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Patent
Implantable wireless sensor for pressure measurement within the heart
TL;DR: In this paper, the progress of a endovascular cardiac repair can be monitored by inserting a pressure transducer sensor using a catheter into a chamber of the heart during the procedure and then using a small, hand-held read out device to measure pressure easily, safely, inexpensively and accurately.
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High Q factor sensor
TL;DR: In this article, a sensor for wirelessly determining a physical property within a defined space comprises an electrical resonance and has a high quality factor Q. The quality factor is sufficiently high that a signal generated by the sensor can be received outside the defined space.
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Implantable wireless sensor
TL;DR: In this article, the progress of endovascular aneurysm repair can be monitored by inserting a pressure transducer sensor using a catheter into the sac during aneurysis repair and then using a small, hand-held read out device to measure pressure easily, safely, inexpensively and accurately.
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Oilfield Apparatus Comprising Swellable Elastomers Having Nanosensors Therein And Methods Of Using Same In Oilfield Application
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Optic fibres and fibre optic sensing
TL;DR: In this article, the core is offset from the center of the cable to increase the bending effect on the core compared with the core being located at the centre of a cable, which can be used for distributed sensing.
References
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Journal ArticleDOI
Frequency and temperature dependence of elastic moduli of polymers
TL;DR: In this article, the frequency and temperature dependence of the elastic moduli of commercially available polymers has been studied in the temperature range of 0-35°C and for frequencies 102-106 Hz.
PatentDOI
Planar fiber-optic interferometric acoustic sensor
TL;DR: In this paper, a sensing portion for an interferometric acousto-optic sensor and a sensor using that sensing fiber are disclosed, which has an outer coating of a material having a low bulk modulus.
PatentDOI
Low flow-noise conformal fiber optic hydrophone
TL;DR: A fiber-optic hydrophone with a pair of jacketed fiber optic windings fed in a concentric planar spiral configuration in a layer of polyurethane is provided in this article.
Patent
Pressure insensitive optical fiber
TL;DR: In this article, an optical fiber waveguide is rendered pressure insensitive by concentrically surrounding it with a substrate of high bulk modulus material having a wall of selected thickness whereby acoustic pressures (e.g. hydrostatic) on the waveguide induce phase change cancellations such that the algebraic sum of e z P +e r P + e z l = 0.
Patent
Pressure sensitive optical fiber having optimized coatings
TL;DR: In this paper, the acoustic pressure sensitivity of an optical fiber waveguide is maximized by surrounding it with an outer coating which is selected from a material having high Young's modulus and low bulk modulus.