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Sensors 2017, 17(11), 2543;

An FBG Optical Approach to Thermal Expansion Measurements under Hydrostatic Pressure

Condensed Matter and Magnet Science Group, Los Alamos National Laboratory, MS K764, Los Alamos, NM 87545, USA
National High Magnetic Field Laboratory, Los Alamos National Laboratory, MS E536, Los Alamos, NM 87545, USA
Institute for Materials Science, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
Author to whom correspondence should be addressed.
Received: 30 September 2017 / Revised: 25 October 2017 / Accepted: 27 October 2017 / Published: 4 November 2017
(This article belongs to the Special Issue Fiber Bragg Grating Based Sensors)
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We report on an optical technique for measuring thermal expansion and magnetostriction at cryogenic temperatures and under applied hydrostatic pressures of 2.0 GPa. Optical fiber Bragg gratings inside a clamp-type pressure chamber are used to measure the strain in a millimeter-sized sample of CeRhIn5. We describe the simultaneous measurement of two Bragg gratings in a single optical fiber using an optical sensing instrument capable of resolving changes in length [dL/L = (LL0)/L0] on the order of 10−7. Our results demonstrate the possibility of performing high-resolution thermal expansion measurements under hydrostatic pressure, a capability previously hindered by the small working volumes typical of pressure cells. View Full-Text
Keywords: optical fiber Bragg grating; hydrostatic pressure; quantum criticality optical fiber Bragg grating; hydrostatic pressure; quantum criticality

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Rosa, P.F.S.; Thomas, S.M.; Balakirev, F.F.; Betts, J.; Seo, S.; Bauer, E.D.; Thompson, J.D.; Jaime, M. An FBG Optical Approach to Thermal Expansion Measurements under Hydrostatic Pressure. Sensors 2017, 17, 2543.

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