Cost-effective quasi-parallel sensing instrumentation for industrial chemical species tomography

Godwin Enemali, Rui Zhang, Hugh McCann, Chang Liu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)
4 Downloads (Pure)


Chemical species tomography (CST) has been widely applied for the imaging of critical gas-phase parameters in industrial processes. To acquire high-fidelity images, CST is typically implemented by the line-of-sight wavelength modulation spectroscopy measurements from multiple laser beams. In this article, we present a novel quasi-parallel sensing technique and electronic circuits for industrial CST. Although the acquisition and processing of these multiple beams using a fully parallel data acquisition and signal processing system can achieve maximized temporal response in CST, it leads to a highly complex and power-consuming instrumentation with electronics-caused inconsistency between the sampled beams, in addition to a significant burden on data transfer infrastructure. To address these issues, the digitization and demodulation of the multibeam signals in the proposed quasi-parallel sensing technique are multiplexed over the high-frequency modulation within a wavelength scan. Our development not only maintains the temporal response of the fully parallel sensing scheme but also facilitates the cost-effective implementation of industrial CST with very low complexity and reduced load on data transfer compared with the fully parallel sensing technique. The proposed technique was analytically proofed and then numerically examined by noise-contaminated CST simulations. Finally, the designed electronics was experimentally validated using a lab-scale CST system with 32 laser beams.
Original languageEnglish
Pages (from-to)2107-2116
Number of pages10
JournalIEEE Transactions on Industrial Electronics
Issue number2
Publication statusPublished - 10 Mar 2021


  • data acquisition
  • quasi -parallel
  • chemical species tomography
  • spectroscopy
  • digital lock-in
  • quasiparallel
  • instrumentation
  • wavelength modulation spectroscopy (WMS)
  • digital lock-in (DLI)
  • Chemical species tomography (CST)
  • data acquisition (DAQ)
  • quasi-parallel

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Systems Engineering


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