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Testing sensors for body surface vibration measurements

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4 Author(s)
H. Mansy ; Dept. of Pediatrics, Rush Med. Coll., Chicago, IL, USA ; R. Sandler ; T. Royston ; D. Jones

A system was constructed to test the performance of transducers for the detection of body surface vibrations. A phantom was manufactured of a gel that approximates properties of soft tissue and the different sensors were used to measure the vibrations at the model surface. One speaker was buried in the phantom to introduce a simulated signal, and another introduced simulated ambient room noise. The frequency-dependent sensor sensitivity to the input signal and ambient noise was investigated for six different sensor types. The laser Doppler sensor provided non-contact measurement with no surface loading, and was chosen as the reference sensor. The sensitivity of all sensors to ambient noise was satisfactory with the all-coupled sensor being most sensitive. The electronic stethoscope had the advantages of high sensitivity to the desired signal, low sensitivity to ambient noise and low cost

Published in:

[Engineering in Medicine and Biology, 1999. 21st Annual Conference and the 1999 Annual Fall Meetring of the Biomedical Engineering Society] BMES/EMBS Conference, 1999. Proceedings of the First Joint  (Volume:2 )

Date of Conference:

Oct 1999