An FPGA-based lock-in detection system to enable chemical species tomography using TDLAS

Andrea  Chighine; Edward  Fisher; David Wilson; Michael Lengden; Walter Johnstone; Hugh McCann

doi:10.1109/IST.2015.7294460

An FPGA-based lock-in detection system to enable chemical species tomography using TDLAS

Andrea Chighine , Edward Fisher , David Wilson, Michael Lengden, Walter Johnstone, Hugh McCann

Electronic And Electrical Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution book

17 Citations (Scopus)

828 Downloads (Pure)

Abstract

This paper presents the design, implementation and test of a compact, low-cost and fully digital signal recovery system for tunable diode laser absorption spectroscopy (TDLAS) in narrow line-width gas sensing applications. An FPGA-based digital lock-in amplifier (DLIA), in conjunction with TDLAS using the wavelength modulation spectroscopy (WMS) technique, is utilized to demodulate and extract first (1f) and second (2f) harmonic signals for a narrow CO2 feature in the spectrum region of 1997.2nm. The spectrum in this wavelength region shows suitably weak water absorption, enabling CO2 detection with high resolution. Gas-cell experiments were carried out using the DLIA and a conventional rack-mounted commercial lock-in amplifier. The comparison between the two systems shows good agreement, validating the feasibility of this approach and demonstrating the prospect for extension to a massively multichannel system to implement Chemical Species Tomography.

Original language	English
Title of host publication	2015 IEEE International Conference on Imaging Systems and Techniques (IST)
Place of Publication	Piscataway, NJ
Publisher	IEEE
Pages	1-5
Number of pages	5
ISBN (Print)	9781479986330
DOIs	https://doi.org/10.1109/IST.2015.7294460
Publication status	Published - Sept 2015

Keywords

amplifiers
chemical variables measurment
measurement by laser beam
absorption
spectrochemical analysis
chemical species tomography

Access to Document

10.1109/IST.2015.7294460

Chighine-etal-IST2015-FPGA-based-lock-in-detection-system-to-enable-chemical-species-tomographyAccepted author manuscript, 453 KB

Cite this

@inproceedings{f3e0eeebf181405b8582181b4038389b,

title = "An FPGA-based lock-in detection system to enable chemical species tomography using TDLAS",

abstract = "This paper presents the design, implementation and test of a compact, low-cost and fully digital signal recovery system for tunable diode laser absorption spectroscopy (TDLAS) in narrow line-width gas sensing applications. An FPGA-based digital lock-in amplifier (DLIA), in conjunction with TDLAS using the wavelength modulation spectroscopy (WMS) technique, is utilized to demodulate and extract first (1f) and second (2f) harmonic signals for a narrow CO2 feature in the spectrum region of 1997.2nm. The spectrum in this wavelength region shows suitably weak water absorption, enabling CO2 detection with high resolution. Gas-cell experiments were carried out using the DLIA and a conventional rack-mounted commercial lock-in amplifier. The comparison between the two systems shows good agreement, validating the feasibility of this approach and demonstrating the prospect for extension to a massively multichannel system to implement Chemical Species Tomography.",

keywords = "amplifiers, chemical variables measurment, measurement by laser beam, absorption , spectrochemical analysis, chemical species tomography",

author = "Andrea Chighine and Edward Fisher and David Wilson and Michael Lengden and Walter Johnstone and Hugh McCann",

note = "{\textcopyright} 2015 IEEE. Personal use of this ma terial is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting /republishing this material for advertising or promotional purposes, creating new collective works, f or resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.",

year = "2015",

month = sep,

doi = "10.1109/IST.2015.7294460",

language = "English",

isbn = "9781479986330",

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booktitle = "2015 IEEE International Conference on Imaging Systems and Techniques (IST)",

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AU - Chighine , Andrea

AU - Fisher , Edward

AU - Wilson, David

AU - Lengden, Michael

AU - Johnstone, Walter

AU - McCann, Hugh

N1 - © 2015 IEEE. Personal use of this ma terial is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting /republishing this material for advertising or promotional purposes, creating new collective works, f or resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

PY - 2015/9

Y1 - 2015/9

N2 - This paper presents the design, implementation and test of a compact, low-cost and fully digital signal recovery system for tunable diode laser absorption spectroscopy (TDLAS) in narrow line-width gas sensing applications. An FPGA-based digital lock-in amplifier (DLIA), in conjunction with TDLAS using the wavelength modulation spectroscopy (WMS) technique, is utilized to demodulate and extract first (1f) and second (2f) harmonic signals for a narrow CO2 feature in the spectrum region of 1997.2nm. The spectrum in this wavelength region shows suitably weak water absorption, enabling CO2 detection with high resolution. Gas-cell experiments were carried out using the DLIA and a conventional rack-mounted commercial lock-in amplifier. The comparison between the two systems shows good agreement, validating the feasibility of this approach and demonstrating the prospect for extension to a massively multichannel system to implement Chemical Species Tomography.

AB - This paper presents the design, implementation and test of a compact, low-cost and fully digital signal recovery system for tunable diode laser absorption spectroscopy (TDLAS) in narrow line-width gas sensing applications. An FPGA-based digital lock-in amplifier (DLIA), in conjunction with TDLAS using the wavelength modulation spectroscopy (WMS) technique, is utilized to demodulate and extract first (1f) and second (2f) harmonic signals for a narrow CO2 feature in the spectrum region of 1997.2nm. The spectrum in this wavelength region shows suitably weak water absorption, enabling CO2 detection with high resolution. Gas-cell experiments were carried out using the DLIA and a conventional rack-mounted commercial lock-in amplifier. The comparison between the two systems shows good agreement, validating the feasibility of this approach and demonstrating the prospect for extension to a massively multichannel system to implement Chemical Species Tomography.

KW - amplifiers

KW - chemical variables measurment

KW - measurement by laser beam

KW - absorption

KW - spectrochemical analysis

KW - chemical species tomography

UR - http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7294460

U2 - 10.1109/IST.2015.7294460

DO - 10.1109/IST.2015.7294460

M3 - Conference contribution book

SN - 9781479986330

SP - 1

EP - 5

BT - 2015 IEEE International Conference on Imaging Systems and Techniques (IST)

PB - IEEE

CY - Piscataway, NJ

ER -

An FPGA-based lock-in detection system to enable chemical species tomography using TDLAS

Abstract

Keywords

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FLITES: Fibre Laser Imaging For Gas Turbine Exhaust Species (FLITES)

Fibre laser imaging of gas turbine exhaust species – a review of CO2 aero engine imaging

Progress towards non-intrusive optical measurement of gas turbine exhaust species distributions

In-situ measurement of combustion produced CO₂ in the 2μm region, within a jet engine exhaust plume

Cite this

An FPGA-based lock-in detection system to enable chemical species tomography using TDLAS

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Projects

FLITES: Fibre Laser Imaging For Gas Turbine Exhaust Species (FLITES)

Research output

Fibre laser imaging of gas turbine exhaust species – a review of CO2 aero engine imaging

Progress towards non-intrusive optical measurement of gas turbine exhaust species distributions

In-situ measurement of combustion produced CO2 in the 2μm region, within a jet engine exhaust plume

Cite this

In-situ measurement of combustion produced CO₂ in the 2μm region, within a jet engine exhaust plume