Miniature modular sensor for chemical species tomography with enhanced spatial resolution

Rui Zhang, Jiangnan Xia, Hugh McCann, Chang Liu, Ihab Ahmed, Mohamed Pourkashanian, Andrew Gough, Ian Armstrong, Michael Lengden, Walter Johnstone

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

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The introduction of low/zero-carbon fuels in gas turbine engines poses challenges to the stability and efficiency of combustion processes. As a result, there is a growing demand for advanced imaging techniques that can provide enhanced spatial resolution to monitor and analyze the physiochemical parameters involved. Chemical Species Tomography (CST), utilizing multiple line-of-sight Laser Absorption Spectroscopy (LAS) measurements, has gained popularity in industrial applications due to its non-intrusive nature, robustness, and high sensitivity. Typically, existing CST sensors have few centimeters beam spacing and are highly customized for specific applications. Therefore, the limited beam spacing, and lack of generality pose challenges in terms of providing sufficient sampling and adaptability for wider application scenarios. To enhance the spatial resolution as well as improve the reconfiguration of the CST sensors, this paper proposes a miniature modular CST sensor with a 1cm beam spacing. The use of off-the-shelf components significantly reduces the cost of the system, making it more practical for industrial implementation. Experimental evaluation of the prototype sensor has been conducted for measurements of temperature and water vapor concentration. The results show consistent and accurate measurements, indicating good reliability of the sensor. The proposed miniature modular sensor offers increased flexibility and adaptability to the various CST systems, paving the way for its commercialization in industrial settings.
Original languageEnglish
Title of host publication2023 IEEE International Conference on Imaging Systems and Techniques (IST)
Place of PublicationPiscataway
Number of pages5
ISBN (Electronic)9798350330830
ISBN (Print)9798350330847
Publication statusPublished - 20 Dec 2023
Event2023 IEEE International Conference on Imaging Systems and Techniques - Copenhagen, Denmark
Duration: 17 Oct 202319 Jan 2024

Publication series

NameIEEE International Workshop on Imaging Systems and Techniques (IST)
ISSN (Print)2471-6162
ISSN (Electronic)2832-4234


Conference2023 IEEE International Conference on Imaging Systems and Techniques


  • miniature sensor
  • laser absorption spectroscopy
  • chemical species tomography


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