Liquid level sensor utilising a long period fiber grating

Steven Grice; Wei Zhang; Kate Sugden; Ian Bennion

doi:10.1117/12.809104

Liquid level sensor utilising a long period fiber grating

Steven Grice^*, Wei Zhang, Kate Sugden, Ian Bennion

^*Corresponding author for this work

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

Abstract

We propose here a liquid level sensor using a long period fiber grating (LPFG) in which direct liquid level measurement is carried out by utilising an LPFG, 100mm in length and a periodicity of 1mm. The LPFG was exposed to liquids with varying levels and the wavelength shift of a selected loss band of the transmission spectra was monitored using a broadband light source and an optical spectrum analyzer. The mechanism of this LPFG sensor is based on the fact that the effective Refractive Index (RI) of a cladding mode is directly dependant on the RI of the surrounding medium, be it air, or in this case water and petrol. As the surrounding RI changes, so does the phase matching condition of the LPFG. The result for the level change of the liquid with a specific RI is both a shift in wavelength and a change in the attenuation level of the selected loss band. For the selected loss band, continuous wavelength shifts of 9.5 nm and 25 nm for 100 mm of water and petrol level change have been observed respectively, with sub-millimetre accuracy.

Original language	English
Title of host publication	Optical Components and Materials VI
Editors	Shibin Jiang, Michel J.F. Digonnet, John W. Glesener, J. Christopher Dries
Place of Publication	Bellingham, WA (US)
Publisher	SPIE
Number of pages	8
ISBN (Print)	978-0-8194-7458-2
DOIs	https://doi.org/10.1117/12.809104
Publication status	Published - 6 Feb 2009
Event	Optical Components and Materials VI - San Jose, CA, United States Duration: 26 Jan 2009 → 28 Jan 2009

Publication series

Name	SPIE Proceedings
Publisher	SPIE
Volume	7212
ISSN (Print)	0277-786X
ISSN (Electronic)	2410-9045

Conference

Conference	Optical Components and Materials VI
Country/Territory	United States
City	San Jose, CA
Period	26/01/09 → 28/01/09

Bibliographical note

S. Grice ; W. Zhang ; K. Sugden and I. Bennion; "Liquid level sensor utilising a long period fiber grating", Proc. SPIE 7212, Optical Components and Materials VI, 72120C (February 06, 2009).

Copyright 2009 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print 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.

DOI: http://dx.doi.org/10.1117/12.809104

Keywords

Broad Band Source
liquid level sensing
long period Fiber grating
optical spectrum analyzer
refractive index
LPFG
BBS

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10.1117/12.809104

Liquid level sensor utilising a long period fiber grating
S. Grice ; W. Zhang ; K. Sugden and I. Bennion; "Liquid level sensor utilising a long period fiber grating", Proc. SPIE 7212, Optical Components and Materials VI, 72120C (February 06, 2009). Copyright 2009 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print 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. DOI: http://dx.doi.org/10.1117/12.809104
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Cite this

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title = "Liquid level sensor utilising a long period fiber grating",

abstract = "We propose here a liquid level sensor using a long period fiber grating (LPFG) in which direct liquid level measurement is carried out by utilising an LPFG, 100mm in length and a periodicity of 1mm. The LPFG was exposed to liquids with varying levels and the wavelength shift of a selected loss band of the transmission spectra was monitored using a broadband light source and an optical spectrum analyzer. The mechanism of this LPFG sensor is based on the fact that the effective Refractive Index (RI) of a cladding mode is directly dependant on the RI of the surrounding medium, be it air, or in this case water and petrol. As the surrounding RI changes, so does the phase matching condition of the LPFG. The result for the level change of the liquid with a specific RI is both a shift in wavelength and a change in the attenuation level of the selected loss band. For the selected loss band, continuous wavelength shifts of 9.5 nm and 25 nm for 100 mm of water and petrol level change have been observed respectively, with sub-millimetre accuracy.",

keywords = "Broad Band Source, liquid level sensing, long period Fiber grating, optical spectrum analyzer, refractive index, LPFG, BBS",

author = "Steven Grice and Wei Zhang and Kate Sugden and Ian Bennion",

note = " S. Grice ; W. Zhang ; K. Sugden and I. Bennion; {"}Liquid level sensor utilising a long period fiber grating{"}, Proc. SPIE 7212, Optical Components and Materials VI, 72120C (February 06, 2009). Copyright 2009 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print 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. DOI: http://dx.doi.org/10.1117/12.809104 ; Optical Components and Materials VI ; Conference date: 26-01-2009 Through 28-01-2009",

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doi = "10.1117/12.809104",

language = "English",

isbn = "978-0-8194-7458-2",

series = "SPIE Proceedings",

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editor = "Shibin Jiang and Digonnet, {Michel J.F.} and Glesener, {John W.} and Dries, {J. Christopher}",

booktitle = "Optical Components and Materials VI",

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Grice, S, Zhang, W, Sugden, K & Bennion, I 2009, Liquid level sensor utilising a long period fiber grating. in S Jiang, MJF Digonnet, JW Glesener & JC Dries (eds), Optical Components and Materials VI., 72120C, SPIE Proceedings, vol. 7212, SPIE, Bellingham, WA (US), Optical Components and Materials VI, San Jose, CA, United States, 26/01/09. https://doi.org/10.1117/12.809104

Liquid level sensor utilising a long period fiber grating. / Grice, Steven; Zhang, Wei; Sugden, Kate et al.
Optical Components and Materials VI. ed. / Shibin Jiang; Michel J.F. Digonnet; John W. Glesener; J. Christopher Dries. Bellingham, WA (US): SPIE, 2009. 72120C (SPIE Proceedings; Vol. 7212).

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

TY - GEN

T1 - Liquid level sensor utilising a long period fiber grating

AU - Grice, Steven

AU - Zhang, Wei

AU - Sugden, Kate

AU - Bennion, Ian

N1 - S. Grice ; W. Zhang ; K. Sugden and I. Bennion; "Liquid level sensor utilising a long period fiber grating", Proc. SPIE 7212, Optical Components and Materials VI, 72120C (February 06, 2009). Copyright 2009 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print 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. DOI: http://dx.doi.org/10.1117/12.809104

PY - 2009/2/6

Y1 - 2009/2/6

N2 - We propose here a liquid level sensor using a long period fiber grating (LPFG) in which direct liquid level measurement is carried out by utilising an LPFG, 100mm in length and a periodicity of 1mm. The LPFG was exposed to liquids with varying levels and the wavelength shift of a selected loss band of the transmission spectra was monitored using a broadband light source and an optical spectrum analyzer. The mechanism of this LPFG sensor is based on the fact that the effective Refractive Index (RI) of a cladding mode is directly dependant on the RI of the surrounding medium, be it air, or in this case water and petrol. As the surrounding RI changes, so does the phase matching condition of the LPFG. The result for the level change of the liquid with a specific RI is both a shift in wavelength and a change in the attenuation level of the selected loss band. For the selected loss band, continuous wavelength shifts of 9.5 nm and 25 nm for 100 mm of water and petrol level change have been observed respectively, with sub-millimetre accuracy.

AB - We propose here a liquid level sensor using a long period fiber grating (LPFG) in which direct liquid level measurement is carried out by utilising an LPFG, 100mm in length and a periodicity of 1mm. The LPFG was exposed to liquids with varying levels and the wavelength shift of a selected loss band of the transmission spectra was monitored using a broadband light source and an optical spectrum analyzer. The mechanism of this LPFG sensor is based on the fact that the effective Refractive Index (RI) of a cladding mode is directly dependant on the RI of the surrounding medium, be it air, or in this case water and petrol. As the surrounding RI changes, so does the phase matching condition of the LPFG. The result for the level change of the liquid with a specific RI is both a shift in wavelength and a change in the attenuation level of the selected loss band. For the selected loss band, continuous wavelength shifts of 9.5 nm and 25 nm for 100 mm of water and petrol level change have been observed respectively, with sub-millimetre accuracy.

KW - Broad Band Source

KW - liquid level sensing

KW - long period Fiber grating

KW - optical spectrum analyzer

KW - refractive index

KW - LPFG

KW - BBS

UR - http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=809368

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AN - SCOPUS:65349158736

SN - 978-0-8194-7458-2

T3 - SPIE Proceedings

BT - Optical Components and Materials VI

A2 - Jiang, Shibin

A2 - Digonnet, Michel J.F.

A2 - Glesener, John W.

A2 - Dries, J. Christopher

PB - SPIE

CY - Bellingham, WA (US)

T2 - Optical Components and Materials VI

Y2 - 26 January 2009 through 28 January 2009

ER -

Liquid level sensor utilising a long period fiber grating

Abstract

Publication series

Conference

Bibliographical note

Keywords

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