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 proceedingConference contribution book

8 Citations (Scopus)

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.
LanguageEnglish
Title of host publication2015 IEEE International Conference on Imaging Systems and Techniques (IST)
Place of PublicationPiscataway, NJ
PublisherIEEE
Pages1-5
Number of pages5
ISBN (Print)9781479986330
DOIs
Publication statusPublished - Sep 2015

Fingerprint

Laser spectroscopy
Absorption spectroscopy
Tomography
Semiconductor lasers
Field programmable gate arrays (FPGA)
Wavelength
Water absorption
Gases
Linewidth
Modulation
Spectroscopy
Recovery
Costs
Experiments

Keywords

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

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) (pp. 1-5). Piscataway, NJ: IEEE. https://doi.org/10.1109/IST.2015.7294460
Chighine , Andrea ; Fisher , Edward ; Wilson, David ; Lengden, Michael ; Johnstone, Walter ; McCann, Hugh. / An FPGA-based lock-in detection system to enable chemical species tomography using TDLAS. 2015 IEEE International Conference on Imaging Systems and Techniques (IST). Piscataway, NJ : IEEE, 2015. pp. 1-5
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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.",
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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). IEEE, Piscataway, NJ, pp. 1-5. 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; Lengden, Michael; Johnstone, Walter; McCann, Hugh.

2015 IEEE International Conference on Imaging Systems and Techniques (IST). Piscataway, NJ : IEEE, 2015. p. 1-5.

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

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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.

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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). Piscataway, NJ: IEEE. 2015. p. 1-5 https://doi.org/10.1109/IST.2015.7294460