Sagnac interferometer based stable phase demodulation system for diaphragm based acoustic sensor

Jun Ma; Yongqin Yu; Wei Jin

doi:10.1117/12.2184271

Sagnac interferometer based stable phase demodulation system for diaphragm based acoustic sensor

Jun Ma, Yongqin Yu, Wei Jin

The Hong Kong Polytechnic University

Research output: Chapter in book / Conference proceeding › Conference article published in proceeding or book › Academic research › peer-review

Abstract

A modified fiber-optic Sagnac interferometer with a stable π/2 phase bias is demonstrated for the demodulation of diaphragm-based acoustic sensors. The phase bias is obtained by introducing a nonreciprocal frequency shift between the counter-propagating waves. The system is passive and without complicated servo-control for phase stabilization. Interrogated by the proposed demodulation system, a 100 nm-thick graphite diaphragm-based acoustic sensor demonstrated a minimum detectable pressure level of ∼ 450 μPa/Hz^1/2at the frequency of 5 kHz and the output signal stability is less than 0.35 dB over an 8-hour period.

Original language	English
Title of host publication	Fifth Asia-Pacific Optical Sensors Conference, APOS 2015
Publisher	SPIE
Volume	9655
ISBN (Electronic)	9781628418651
DOIs	https://doi.org/10.1117/12.2184271
Publication status	Published - 1 Jan 2015
Event	5th Asia-Pacific Optical Sensors Conference, APOS 2015 - Lotte City Hotel Jeju, Jeju, Korea, Republic of Duration: 20 May 2015 → 22 May 2015

Conference

Conference	5th Asia-Pacific Optical Sensors Conference, APOS 2015
Country/Territory	Korea, Republic of
City	Jeju
Period	20/05/15 → 22/05/15

Keywords

acoustic sensor
graphite diaphragm
Optical fiber sensor
Sagnac interferometer

ASJC Scopus subject areas

Applied Mathematics
Computer Science Applications
Electrical and Electronic Engineering
Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1117/12.2184271

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title = "Sagnac interferometer based stable phase demodulation system for diaphragm based acoustic sensor",

abstract = "A modified fiber-optic Sagnac interferometer with a stable π/2 phase bias is demonstrated for the demodulation of diaphragm-based acoustic sensors. The phase bias is obtained by introducing a nonreciprocal frequency shift between the counter-propagating waves. The system is passive and without complicated servo-control for phase stabilization. Interrogated by the proposed demodulation system, a 100 nm-thick graphite diaphragm-based acoustic sensor demonstrated a minimum detectable pressure level of ∼ 450 μPa/Hz1/2at the frequency of 5 kHz and the output signal stability is less than 0.35 dB over an 8-hour period.",

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AU - Ma, Jun

AU - Yu, Yongqin

AU - Jin, Wei

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N2 - A modified fiber-optic Sagnac interferometer with a stable π/2 phase bias is demonstrated for the demodulation of diaphragm-based acoustic sensors. The phase bias is obtained by introducing a nonreciprocal frequency shift between the counter-propagating waves. The system is passive and without complicated servo-control for phase stabilization. Interrogated by the proposed demodulation system, a 100 nm-thick graphite diaphragm-based acoustic sensor demonstrated a minimum detectable pressure level of ∼ 450 μPa/Hz1/2at the frequency of 5 kHz and the output signal stability is less than 0.35 dB over an 8-hour period.

AB - A modified fiber-optic Sagnac interferometer with a stable π/2 phase bias is demonstrated for the demodulation of diaphragm-based acoustic sensors. The phase bias is obtained by introducing a nonreciprocal frequency shift between the counter-propagating waves. The system is passive and without complicated servo-control for phase stabilization. Interrogated by the proposed demodulation system, a 100 nm-thick graphite diaphragm-based acoustic sensor demonstrated a minimum detectable pressure level of ∼ 450 μPa/Hz1/2at the frequency of 5 kHz and the output signal stability is less than 0.35 dB over an 8-hour period.

KW - acoustic sensor

KW - graphite diaphragm

KW - Optical fiber sensor

KW - Sagnac interferometer

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DO - 10.1117/12.2184271

M3 - Conference article published in proceeding or book

VL - 9655

BT - Fifth Asia-Pacific Optical Sensors Conference, APOS 2015

PB - SPIE

T2 - 5th Asia-Pacific Optical Sensors Conference, APOS 2015

Y2 - 20 May 2015 through 22 May 2015

ER -

Sagnac interferometer based stable phase demodulation system for diaphragm based acoustic sensor

Abstract

Conference

Keywords

ASJC Scopus subject areas

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