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Helium Gas Purity Monitor based on Low Frequency Acoustic Resonance

Kasthurirengan, S and Jacob, S and Karunanithi, R and Karthikeyan, A (1996) Helium Gas Purity Monitor based on Low Frequency Acoustic Resonance. In: Czechoslovak Journal of Physics, 46 (05). pp. 2779-2780.

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Monitoring gas purity is an important aspect of gas recovery stations where air is usually one of the major impurities. Purity monitors of Katherometric type ate commercially available for this purpose. Alternatively, we discuss here a helium gas purity monitor based on acoustic resonance of a cavity at audio frequencies. It measures the purity by monitoring the resonant frequency of a cylindrical cavity filled with the gas under test and excited by conventional telephone transducers fixed at the ends. The use of the latter simplifies the design considerably. The paper discusses the details of the resonant cavity and the electronic circuit along with temperature compensation. The unit has been calibrated with helium gas of known purities. The unit has a response time of the order of 10 minutes and measures the gas purity to an accuracy of 0.02%. The unit has been installed in our helium recovery system and is found to perform satisfactorily.

Item Type: Journal Article
Publication: Czechoslovak Journal of Physics
Publisher: Springer
Additional Information: Copyright of this article belongs to Springer.
Department/Centre: Division of Physical & Mathematical Sciences > Centre for Cryogenic Technology
Date Deposited: 20 Aug 2009 09:01
Last Modified: 19 Sep 2010 05:28
URI: http://eprints.iisc.ac.in/id/eprint/19410

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