Femtosecond laser inscribed Bragg sensor in Terfenol-D coated optical fibre with ablated microslot for the detection of static magnetic fields

Graham N. Smith; Thomas D.P. Allsop; Kyriacos Kalli; Charalambos Koutsides; Ron Neal; Kate  Sugden; Philip Culverhouse; Ian Bennion

doi:10.1117/12.885122

Femtosecond laser inscribed Bragg sensor in Terfenol-D coated optical fibre with ablated microslot for the detection of static magnetic fields

Graham N. Smith, Thomas D.P. Allsop, Kyriacos Kalli, Charalambos Koutsides, Ron Neal, Kate Sugden, Philip Culverhouse, Ian Bennion

Research output: Chapter in Book/Published conference output › Other chapter contribution

Abstract

A novel device for the detection and characterisation of static magnetic fields is presented. It consists of a femtosecond laser inscribed fibre Bragg grating (FBG) that is incorporated into an optical fibre with a femtosecond laser micromachined slot. The symmetry of the fibre is broken by the micro-slot, producing non-uniform strain across the fibre cross section. The sensing region is coated with Terfenol-D making the device sensitive to static magnetic fields, whereas the symmetry breaking results in a vectorial sensor for the detection of magnetic fields as low as 0.046 mT with a resolution of ±0.3mT in transmission and ±0.7mT in reflection. The sensor output is directly wavelength encoded from the FBG filtering, leading to simple demodulation through the monitoring of wavelength shifts that result as the fibre structure changes shape in response to the external magnetic field. The use of a femtosecond laser to both inscribe the FBG and micro-machine the slot in a single stage, prior to coating the device, significantly simplifies the sensor fabrication.

Original language	English
Title of host publication	21st international conference on optical fiber sensors
Editors	Wojtek J. Bock, Jacques Albert, Xiaoyi Bao
Publisher	SPIE
Number of pages	4
ISBN (Print)	978-0-8194-8246-4
DOIs	https://doi.org/10.1117/12.885122
Publication status	Published - Jan 2011
Event	21st International Conference on Optical Fiber Sensors - Ottawa, ON, Canada Duration: 15 May 2011 → 19 May 2011 http://www.ofs21.org/

Publication series

Name	SPIE proceedings
Publisher	SPIE
Volume	7753
ISSN (Print)	0277-786X

Conference

Conference	21st International Conference on Optical Fiber Sensors
Abbreviated title	OFS21
Country/Territory	Canada
City	Ottawa, ON
Period	15/05/11 → 19/05/11
Internet address	http://www.ofs21.org/

Bibliographical note

G. N. Smith ; T. Allsop ; K. Kalli ; C. Koutsides ; R. Neal ; K. Sugden ; P. Culverhouse and I. Bennion "Femtosecond laser inscribed Bragg sensor in Terfenol-D coated optical fibre with ablated microslot for the detection of static magnetic fields", Wojtek J. Bock ; Jacques Albert ; Xiaoyi Bao (eds); Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77536N (May 17, 2011).
Copyright 2011 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/10.1117/12.885122

Keywords

fiber Bragg gratings
optical fiber sensors
femtosecond laser

Access to Document

10.1117/12.885122

Femtosecond laser inscribed Bragg sensor in Terfenol-D
G. N. Smith ; T. Allsop ; K. Kalli ; C. Koutsides ; R. Neal ; K. Sugden ; P. Culverhouse and I. Bennion "Femtosecond laser inscribed Bragg sensor in Terfenol-D coated optical fibre with ablated microslot for the detection of static magnetic fields", Wojtek J. Bock ; Jacques Albert ; Xiaoyi Bao (eds); Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77536N (May 17, 2011). Copyright 2011 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/10.1117/12.885122
Final published version, 984 KB

Cite this

Smith, G. N., Allsop, T. D. P., Kalli, K., Koutsides, C., Neal, R., Sugden, K., Culverhouse, P., & Bennion, I. (2011). Femtosecond laser inscribed Bragg sensor in Terfenol-D coated optical fibre with ablated microslot for the detection of static magnetic fields. In W. J. Bock, J. Albert, & X. Bao (Eds.), 21st international conference on optical fiber sensors (SPIE proceedings; Vol. 7753). SPIE. https://doi.org/10.1117/12.885122

@inbook{1a56b17d642b4ef4ae3992b690007e73,

title = "Femtosecond laser inscribed Bragg sensor in Terfenol-D coated optical fibre with ablated microslot for the detection of static magnetic fields",

abstract = "A novel device for the detection and characterisation of static magnetic fields is presented. It consists of a femtosecond laser inscribed fibre Bragg grating (FBG) that is incorporated into an optical fibre with a femtosecond laser micromachined slot. The symmetry of the fibre is broken by the micro-slot, producing non-uniform strain across the fibre cross section. The sensing region is coated with Terfenol-D making the device sensitive to static magnetic fields, whereas the symmetry breaking results in a vectorial sensor for the detection of magnetic fields as low as 0.046 mT with a resolution of ±0.3mT in transmission and ±0.7mT in reflection. The sensor output is directly wavelength encoded from the FBG filtering, leading to simple demodulation through the monitoring of wavelength shifts that result as the fibre structure changes shape in response to the external magnetic field. The use of a femtosecond laser to both inscribe the FBG and micro-machine the slot in a single stage, prior to coating the device, significantly simplifies the sensor fabrication.",

keywords = "fiber Bragg gratings, optical fiber sensors, femtosecond laser",

author = "Smith, {Graham N.} and Allsop, {Thomas D.P.} and Kyriacos Kalli and Charalambos Koutsides and Ron Neal and Kate Sugden and Philip Culverhouse and Ian Bennion",

note = "G. N. Smith ; T. Allsop ; K. Kalli ; C. Koutsides ; R. Neal ; K. Sugden ; P. Culverhouse and I. Bennion {"}Femtosecond laser inscribed Bragg sensor in Terfenol-D coated optical fibre with ablated microslot for the detection of static magnetic fields{"}, Wojtek J. Bock ; Jacques Albert ; Xiaoyi Bao (eds); Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77536N (May 17, 2011). Copyright 2011 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/10.1117/12.885122 ; 21st International Conference on Optical Fiber Sensors, OFS21 ; Conference date: 15-05-2011 Through 19-05-2011",

year = "2011",

month = jan,

doi = "10.1117/12.885122",

language = "English",

isbn = "978-0-8194-8246-4",

series = "SPIE proceedings",

publisher = "SPIE",

editor = "Bock, {Wojtek J.} and Jacques Albert and Xiaoyi Bao",

booktitle = "21st international conference on optical fiber sensors",

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url = "http://www.ofs21.org/",

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Smith, GN, Allsop, TDP, Kalli, K, Koutsides, C, Neal, R, Sugden, K, Culverhouse, P & Bennion, I 2011, Femtosecond laser inscribed Bragg sensor in Terfenol-D coated optical fibre with ablated microslot for the detection of static magnetic fields. in WJ Bock, J Albert & X Bao (eds), 21st international conference on optical fiber sensors. SPIE proceedings, vol. 7753, SPIE, 21st International Conference on Optical Fiber Sensors, Ottawa, ON, Canada, 15/05/11. https://doi.org/10.1117/12.885122

Femtosecond laser inscribed Bragg sensor in Terfenol-D coated optical fibre with ablated microslot for the detection of static magnetic fields. / Smith, Graham N.; Allsop, Thomas D.P.; Kalli, Kyriacos et al.
21st international conference on optical fiber sensors. ed. / Wojtek J. Bock; Jacques Albert; Xiaoyi Bao. SPIE, 2011. (SPIE proceedings; Vol. 7753).

Research output: Chapter in Book/Published conference output › Other chapter contribution

TY - CHAP

T1 - Femtosecond laser inscribed Bragg sensor in Terfenol-D coated optical fibre with ablated microslot for the detection of static magnetic fields

AU - Smith, Graham N.

AU - Allsop, Thomas D.P.

AU - Kalli, Kyriacos

AU - Koutsides, Charalambos

AU - Neal, Ron

AU - Sugden, Kate

AU - Culverhouse, Philip

AU - Bennion, Ian

N1 - G. N. Smith ; T. Allsop ; K. Kalli ; C. Koutsides ; R. Neal ; K. Sugden ; P. Culverhouse and I. Bennion "Femtosecond laser inscribed Bragg sensor in Terfenol-D coated optical fibre with ablated microslot for the detection of static magnetic fields", Wojtek J. Bock ; Jacques Albert ; Xiaoyi Bao (eds); Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77536N (May 17, 2011). Copyright 2011 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/10.1117/12.885122

PY - 2011/1

Y1 - 2011/1

N2 - A novel device for the detection and characterisation of static magnetic fields is presented. It consists of a femtosecond laser inscribed fibre Bragg grating (FBG) that is incorporated into an optical fibre with a femtosecond laser micromachined slot. The symmetry of the fibre is broken by the micro-slot, producing non-uniform strain across the fibre cross section. The sensing region is coated with Terfenol-D making the device sensitive to static magnetic fields, whereas the symmetry breaking results in a vectorial sensor for the detection of magnetic fields as low as 0.046 mT with a resolution of ±0.3mT in transmission and ±0.7mT in reflection. The sensor output is directly wavelength encoded from the FBG filtering, leading to simple demodulation through the monitoring of wavelength shifts that result as the fibre structure changes shape in response to the external magnetic field. The use of a femtosecond laser to both inscribe the FBG and micro-machine the slot in a single stage, prior to coating the device, significantly simplifies the sensor fabrication.

AB - A novel device for the detection and characterisation of static magnetic fields is presented. It consists of a femtosecond laser inscribed fibre Bragg grating (FBG) that is incorporated into an optical fibre with a femtosecond laser micromachined slot. The symmetry of the fibre is broken by the micro-slot, producing non-uniform strain across the fibre cross section. The sensing region is coated with Terfenol-D making the device sensitive to static magnetic fields, whereas the symmetry breaking results in a vectorial sensor for the detection of magnetic fields as low as 0.046 mT with a resolution of ±0.3mT in transmission and ±0.7mT in reflection. The sensor output is directly wavelength encoded from the FBG filtering, leading to simple demodulation through the monitoring of wavelength shifts that result as the fibre structure changes shape in response to the external magnetic field. The use of a femtosecond laser to both inscribe the FBG and micro-machine the slot in a single stage, prior to coating the device, significantly simplifies the sensor fabrication.

KW - fiber Bragg gratings

KW - optical fiber sensors

KW - femtosecond laser

UR - http://www.scopus.com/inward/record.url?scp=79957975401&partnerID=8YFLogxK

UR - http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1347133

U2 - 10.1117/12.885122

DO - 10.1117/12.885122

M3 - Other chapter contribution

AN - SCOPUS:79957975401

SN - 978-0-8194-8246-4

T3 - SPIE proceedings

BT - 21st international conference on optical fiber sensors

A2 - Bock, Wojtek J.

A2 - Albert, Jacques

A2 - Bao, Xiaoyi

PB - SPIE

T2 - 21st International Conference on Optical Fiber Sensors

Y2 - 15 May 2011 through 19 May 2011

ER -

Femtosecond laser inscribed Bragg sensor in Terfenol-D coated optical fibre with ablated microslot for the detection of static magnetic fields

Abstract

Publication series

Conference

Bibliographical note

Keywords

Access to Document

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