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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.9

ISSN Imprimir: 2152-5102
ISSN On-line: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v23.i3-4.110
pages 278-287

Frequency Distortions Introduced by Contact Sensors in Single and Two-Channel Sensing of Respiration Noise

Valery Oliynik
Institute of Hydromechanics of National Academy of Sciences of Ukraine

RESUMO

Aspects of designing multi-channel systems for electronic recording of respiration noise from the surface of the chest cavity are examined. The suggested mathematical model is employed for calculating the frequency curves of an output signal from single- and two-channel respiration-noise pickups. It is established that at frequencies below 500 Hz chestpiece pickups whose specific mechanical impedance exceeds the specific impedance of the chest-cavity surface (heavy chestpieces) markedly affect the vibrations of the contact spot as compared with a the pickup-free chest cavity. The interaction of contact pickups with the surface wave in two-chestpiece sensing of respiration noise is investigated. It is shown that signals from closely-spaced heavy chestpieces significantly affect one another. This distorts the frequency curve of the received signal as compared with the case of single-chestpiece sensing.


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