Document Detail

Signal processing of impedance spectrum for speed of sound and pressure measurement in plane or radial resonators.
MedLine Citation:
PMID:  18532693     Owner:  NLM     Status:  In-Data-Review    
The impedance of gas contained between two plane walls is a periodic function of the frequency. The frequency interval between two resonances of the gas is equal to c2D. Furthermore, the amplitude of the resonances is proportional to the pressure. We describe a signal processing to easily deduce the speed of sound and the pressure of the gas from the impedance spectrum. We show that the modulus of the Fourier transform of the modulus of impedance, called "Tempograph," contains all information about the gas. In some industrial cases the container is a cylinder or a sphere which can be used as a radial resonator exited by a radial wave [1, 2]. The frequency response of such resonator at high frequencies is quasi-periodic and thus the same signal processing can be used. [1] M. F. Narbey, et al., "Determination of the composition of a gas mixture in a nuclear fuel rod by an acoustic method." INSIGHT, 42(9), 603-605 (2000). [2] A. Olson, "Helium bottle pressure measurement by portable ultrasonic technique." 1989, Rapport de Boeing n degrees AD-A208 994, http:stinet.dtic.milstrindex.html.
Eric Rosenkrantz; Jean-Yves Ferrandis; Gerard Leveque
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  123     ISSN:  1520-8524     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2008 May 
Date Detail:
Created Date:  2008-06-05     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3929     Citation Subset:  IM    
Radio Application Division, NEC Corporation, Université Montpellier II, Place Eugène Bataillon, 34095 Montpellier, France,
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