All-fiber vibration sensor based on a Fabry-Perot interferometer and a microstructure beam

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Original languageEnglish
Pages (from-to)1211-1215
Journal / PublicationJournal of the Optical Society of America B: Optical Physics
Volume30
Issue number5
Publication statusPublished - May 2013

Abstract

We demonstrate an all-fiber sensor for low-frequency vibration measurements. The sensor is based on the configuration of a Fabry-Perot interferometer (FPI), where the first mirror of the FPI is a splice joint between a singlemode fiber and a hollow-core fiber (HCF) and the second mirror is the end face of an etched microstructure support beam inserted into the HCF. The support beam consists of a mass block in the middle and can oscillate freely in the HCF when the sensor is subject to vibration. Our experimental sensor using a 60 mm long support beam with a diameter of 35 μm and a mass block of 2.95 × 10-8 kg can detect vibrations at frequencies lower than 1 Hz with an acceleration resolution of 8.35 × 10-7g and a measurement range of ±2.24 g. The sensor output varies by only 2.5% when the temperature changes from 20°C to 120°C. The sensor could be embedded in composite material and find applications in harsh environments. © 2013 Optical Society of America.