Interferometric and fibre Bragg grating sensor interrogation using an arrayed waveguide grating

David C.C. Norman; David J. Webb; Ralf D. Pechstedt

doi:10.1117/12.545069

Interferometric and fibre Bragg grating sensor interrogation using an arrayed waveguide grating

David C.C. Norman, David J. Webb, Ralf D. Pechstedt

Aston Institute of Photonic Technologies (AiPT)

Research output: Chapter in Book/Published conference output › Conference publication

Abstract

We investigate the use of an arrayed waveguide grating (AWG) to interrogate both fibre Bragg grating (FBG) and interferometric sensors. A broadband light source is used to illuminate both the FBG and interferometric sensors. Reflected spectral information is directed to an AWG with integral photodetectors providing 40 electrical outputs. To interrogate interferometric sensors we investigated the dual wavelength technique to measure the distance of a Fabry-Perot cavity, which produced a maximum unambiguous range of 1440μm with an active sensor. Three methods are described to interrogate FBG sensors. The first technique makes use of the reflected light intensity in an AWG channel passband from a narrow bandwidth grating, giving a usable range of 500με and a dynamic strain resolution of 96nε/√Hz at 30Hz. The second approach utilises wide gratings larger than the channel spacing of the AWG; by monitoring the intensity present in corresponding AWG channels an improved range of 1890με was achieved. The third method improves the dynamic range by utilising a heterodyne approach based on interferometric wavelength shift detection providing a dynamic strain resolution of 17nε/√Hz at 30Hz.

Original language	English
Title of host publication	Optical sensing
Editors	Brian Culshaw, Anna G. Mignani, Rainer Riesenberg
Publisher	SPIE
Pages	101-108
Number of pages	8
ISBN (Print)	978-0-8194-5381-5
DOIs	https://doi.org/10.1117/12.545069
Publication status	Published - 2004
Event	Optical Sensing - Strasbourg, France Duration: 26 Apr 2004 → 27 Apr 2004

Publication series

Name	SPIE proceedings
Publisher	SPIE
Volume	5459
ISSN (Print)	0277-786X

Conference

Conference	Optical Sensing
Country/Territory	France
City	Strasbourg
Period	26/04/04 → 27/04/04

Bibliographical note

David C. C. Norman ; David J. Webb and Ralf D. Pechstedt; "Interferometric and fibre Bragg grating sensor interrogation using an arrayed waveguide grating", Proc. SPIE 5459, Optical Sensing, 101 (September 1, 2004).

Copyright 2004 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

http://dx.doi.org/10.1117/12.545069

Keywords

arrayed waveguide grating
fibre Bragg grating
interferometric
Mach-Zehnder
Sensor

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10.1117/12.545069

Interferometric and fibre Bragg grating sensor interrogation using an arrayed waveguide grating
David C. C. Norman ; David J. Webb and Ralf D. Pechstedt; "Interferometric and fibre Bragg grating sensor interrogation using an arrayed waveguide grating", Proc. SPIE 5459, Optical Sensing, 101 (September 1, 2004). Copyright 2004 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. http://dx.doi.org/10.1117/12.545069
Final published version, 307 KB

Cite this

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title = "Interferometric and fibre Bragg grating sensor interrogation using an arrayed waveguide grating",

abstract = "We investigate the use of an arrayed waveguide grating (AWG) to interrogate both fibre Bragg grating (FBG) and interferometric sensors. A broadband light source is used to illuminate both the FBG and interferometric sensors. Reflected spectral information is directed to an AWG with integral photodetectors providing 40 electrical outputs. To interrogate interferometric sensors we investigated the dual wavelength technique to measure the distance of a Fabry-Perot cavity, which produced a maximum unambiguous range of 1440μm with an active sensor. Three methods are described to interrogate FBG sensors. The first technique makes use of the reflected light intensity in an AWG channel passband from a narrow bandwidth grating, giving a usable range of 500με and a dynamic strain resolution of 96nε/√Hz at 30Hz. The second approach utilises wide gratings larger than the channel spacing of the AWG; by monitoring the intensity present in corresponding AWG channels an improved range of 1890με was achieved. The third method improves the dynamic range by utilising a heterodyne approach based on interferometric wavelength shift detection providing a dynamic strain resolution of 17nε/√Hz at 30Hz.",

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AU - Webb, David J.

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N1 - David C. C. Norman ; David J. Webb and Ralf D. Pechstedt; "Interferometric and fibre Bragg grating sensor interrogation using an arrayed waveguide grating", Proc. SPIE 5459, Optical Sensing, 101 (September 1, 2004). Copyright 2004 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. http://dx.doi.org/10.1117/12.545069

PY - 2004

Y1 - 2004

N2 - We investigate the use of an arrayed waveguide grating (AWG) to interrogate both fibre Bragg grating (FBG) and interferometric sensors. A broadband light source is used to illuminate both the FBG and interferometric sensors. Reflected spectral information is directed to an AWG with integral photodetectors providing 40 electrical outputs. To interrogate interferometric sensors we investigated the dual wavelength technique to measure the distance of a Fabry-Perot cavity, which produced a maximum unambiguous range of 1440μm with an active sensor. Three methods are described to interrogate FBG sensors. The first technique makes use of the reflected light intensity in an AWG channel passband from a narrow bandwidth grating, giving a usable range of 500με and a dynamic strain resolution of 96nε/√Hz at 30Hz. The second approach utilises wide gratings larger than the channel spacing of the AWG; by monitoring the intensity present in corresponding AWG channels an improved range of 1890με was achieved. The third method improves the dynamic range by utilising a heterodyne approach based on interferometric wavelength shift detection providing a dynamic strain resolution of 17nε/√Hz at 30Hz.

AB - We investigate the use of an arrayed waveguide grating (AWG) to interrogate both fibre Bragg grating (FBG) and interferometric sensors. A broadband light source is used to illuminate both the FBG and interferometric sensors. Reflected spectral information is directed to an AWG with integral photodetectors providing 40 electrical outputs. To interrogate interferometric sensors we investigated the dual wavelength technique to measure the distance of a Fabry-Perot cavity, which produced a maximum unambiguous range of 1440μm with an active sensor. Three methods are described to interrogate FBG sensors. The first technique makes use of the reflected light intensity in an AWG channel passband from a narrow bandwidth grating, giving a usable range of 500με and a dynamic strain resolution of 96nε/√Hz at 30Hz. The second approach utilises wide gratings larger than the channel spacing of the AWG; by monitoring the intensity present in corresponding AWG channels an improved range of 1890με was achieved. The third method improves the dynamic range by utilising a heterodyne approach based on interferometric wavelength shift detection providing a dynamic strain resolution of 17nε/√Hz at 30Hz.

KW - arrayed waveguide grating

KW - fibre Bragg grating

KW - interferometric

KW - Mach-Zehnder

KW - Sensor

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DO - 10.1117/12.545069

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SN - 978-0-8194-5381-5

T3 - SPIE proceedings

SP - 101

EP - 108

BT - Optical sensing

A2 - Culshaw, Brian

A2 - Mignani, Anna G.

A2 - Riesenberg, Rainer

PB - SPIE

T2 - Optical Sensing

Y2 - 26 April 2004 through 27 April 2004

ER -

Interferometric and fibre Bragg grating sensor interrogation using an arrayed waveguide grating

Abstract

Publication series

Conference

Bibliographical note

Keywords

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