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

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

Abstract / Description of output

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)
Publisher	Institute of Electrical and Electronics Engineers
ISBN (Electronic)	9781479986330
DOIs	https://doi.org/10.1109/IST.2015.7294460
Publication status	Published - 8 Oct 2015
Event	12th IEEE International Conference on Imaging Systems and Techniques, IST 2015 - Macau, China Duration: 16 Sept 2015 → 18 Sept 2015

Publication series

Name	IST 2015 - 2015 IEEE International Conference on Imaging Systems and Techniques, Proceedings

Conference

Conference	12th IEEE International Conference on Imaging Systems and Techniques, IST 2015
Country/Territory	China
City	Macau
Period	16/09/15 → 18/09/15

Keywords / Materials (for Non-textual outputs)

Chemical Species Tomography (CST)
Digital demodulation
Field Programmable Gate Arrays (FPGA)
Lock-in amplifier
Tunable Diode Laser Spectroscopy (TDLAS)

Access to Document

10.1109/IST.2015.7294460

Cite this

Chighine, A., Fisher, E., Wilson, D., Lengden, M., Johnstone, W., & McCann, H. (2015). An FPGA-based lock-in detection system to enable Chemical Species Tomography using TDLAS. In 2015 IEEE International Conference on Imaging Systems and Techniques (IST) Article 7294460 (IST 2015 - 2015 IEEE International Conference on Imaging Systems and Techniques, Proceedings). Institute of Electrical and Electronics Engineers. https://doi.org/10.1109/IST.2015.7294460

Chighine, Andrea ; Fisher, Edward ; Wilson, David et al. / An FPGA-based lock-in detection system to enable Chemical Species Tomography using TDLAS. 2015 IEEE International Conference on Imaging Systems and Techniques (IST). Institute of Electrical and Electronics Engineers, 2015. (IST 2015 - 2015 IEEE International Conference on Imaging Systems and Techniques, Proceedings).

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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 = "Chemical Species Tomography (CST), Digital demodulation, Field Programmable Gate Arrays (FPGA), Lock-in amplifier, Tunable Diode Laser Spectroscopy (TDLAS)",

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

note = "Publisher Copyright: {\textcopyright} 2015 IEEE.; 12th IEEE International Conference on Imaging Systems and Techniques, IST 2015 ; Conference date: 16-09-2015 Through 18-09-2015",

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doi = "10.1109/IST.2015.7294460",

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Chighine, A, Fisher, E, Wilson, D, Lengden, M, Johnstone, W & McCann, H 2015, An FPGA-based lock-in detection system to enable Chemical Species Tomography using TDLAS. in 2015 IEEE International Conference on Imaging Systems and Techniques (IST)., 7294460, IST 2015 - 2015 IEEE International Conference on Imaging Systems and Techniques, Proceedings, Institute of Electrical and Electronics Engineers, 12th IEEE International Conference on Imaging Systems and Techniques, IST 2015, Macau, China, 16/09/15. https://doi.org/10.1109/IST.2015.7294460

An FPGA-based lock-in detection system to enable Chemical Species Tomography using TDLAS. / Chighine, Andrea; Fisher, Edward; Wilson, David et al.
2015 IEEE International Conference on Imaging Systems and Techniques (IST). Institute of Electrical and Electronics Engineers, 2015. 7294460 (IST 2015 - 2015 IEEE International Conference on Imaging Systems and Techniques, Proceedings).

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

TY - GEN

T1 - An FPGA-based lock-in detection system to enable Chemical Species Tomography using TDLAS

AU - Chighine, Andrea

AU - Fisher, Edward

AU - Wilson, David

AU - Lengden, Michael

AU - Johnstone, Walter

AU - McCann, Hugh

PY - 2015/10/8

Y1 - 2015/10/8

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 - Chemical Species Tomography (CST)

KW - Digital demodulation

KW - Field Programmable Gate Arrays (FPGA)

KW - Lock-in amplifier

KW - Tunable Diode Laser Spectroscopy (TDLAS)

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U2 - 10.1109/IST.2015.7294460

DO - 10.1109/IST.2015.7294460

M3 - Conference contribution

AN - SCOPUS:84962719602

T3 - IST 2015 - 2015 IEEE International Conference on Imaging Systems and Techniques, Proceedings

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

PB - Institute of Electrical and Electronics Engineers

T2 - 12th IEEE International Conference on Imaging Systems and Techniques, IST 2015

Y2 - 16 September 2015 through 18 September 2015

ER -

Chighine A, Fisher E, Wilson D, Lengden M, Johnstone W, McCann H. An FPGA-based lock-in detection system to enable Chemical Species Tomography using TDLAS. In 2015 IEEE International Conference on Imaging Systems and Techniques (IST). Institute of Electrical and Electronics Engineers. 2015. 7294460. (IST 2015 - 2015 IEEE International Conference on Imaging Systems and Techniques, Proceedings). doi: 10.1109/IST.2015.7294460

An FPGA-based lock-in detection system to enable Chemical Species Tomography using TDLAS

Abstract / Description of output

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Keywords / Materials (for Non-textual outputs)

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Cite this