Ethylene Detection using Laser Modulated Photoacoustic Resonance at 1625nm

Leis, John and Buttsworth, David (2019) Ethylene Detection using Laser Modulated Photoacoustic Resonance at 1625nm. In: 9th Australian Conference on Laser Diagnostics (IX ACLD), 2-4 Dec, 2019, Adelaide, Australia.


Abstract

The detection of ethylene (ethene) gas at parts-per-million concentrations is important for agricultural product transportation, storage and retailing, since ethylene affects the ripening behaviour of many fruit species. In-situ detection at these levels is a difficult problem, and there is a need for a portable and self-calibrating instrument at reasonable cost. Present solutions are too bulky and expensive for widespread use in the food industry. The laser-induced photoacoustic
approach is promising for very low concentrations, but the determination of appropriate operating wavelength remains problematic for ethylene. Furthermore, the signal-to-noise ratio of the recovered photoacoustic signal is poor when room-temperature low-power diode lasers are employed. We present experimental results which indicate that the phase of the recovered photoacoustic signal is able to perform a discriminant function at 200 parts per million, whereas the magnitude does not appear to provide adequate discrimination at the power levels employed.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering (1 Jul 2013 -)
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering (1 Jul 2013 -)
Date Deposited: 11 Aug 2020 03:54
Last Modified: 01 Oct 2020 00:51
Uncontrolled Keywords: laser, infrared, gas detection
Fields of Research (2008): 09 Engineering > 0906 Electrical and Electronic Engineering > 090606 Photonics and Electro-Optical Engineering (excl. Communications)
Fields of Research (2020): 40 ENGINEERING > 4009 Electronics, sensors and digital hardware > 400909 Photonic and electro-optical devices, sensors and systems (excl. communications)
Socio-Economic Objectives (2008): B Economic Development > 82 Plant Production and Plant Primary Products > 8206 Harvesting and Packing of Plant Products > 820602 Fresh Fruits and Vegetables (Post Harvest)
URI: http://eprints.usq.edu.au/id/eprint/37428

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