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)
562 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 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

Keywords

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

Fingerprint Dive into the research topics of 'An FPGA-based lock-in detection system to enable chemical species tomography using TDLAS'. Together they form a unique fingerprint.

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

    Wright, P., McCormick, D., Ozanyan, K., Johnson, M., Black, J., Fisher, E., Chighine, A., Polydorides, N., McCann, H., Feng, Y., Khan, K., Bastock, P., Jia, F., Hewak, D., Nilsson, J., Lengden, M., Wilson, D., Armstrong, I., Benoy, T. & Johnstone, W., 7 Mar 2015, Aerospace Conference, 2015 IEEE . IEEE, p. 1-14 14 p.

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

    Open Access
    File
  • 11 Citations (Scopus)
    103 Downloads (Pure)
  • Cite this