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Accession number;03A0567693
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| Title;Elimination of Noise of Accelerometer-Type Stethoscopic Sensors, II-Blocking Noise Waves Travelling along the Body Surface |
| Author;
SAKAO FUJIHIKO
(Kinki Univ., Faculty of Engineering, JPN)
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Journal Title;Clinical Pharmacology and Therapy
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Journal Code:L1701A
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ISSN:0917-3994
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VOL.13;NO.4;PAGE.305-310(2003)
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| Figure&Table&Reference;FIG.6, REF.4 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Attaching a mass onto the cable of an accelerometer-type stethoscopic sensor is efficient for cutting-off noise-waves travelling through the cable to the sensor. Similarly, a massive ring on the skin surrounding the sensor should be effective to block surface waves carrying noises generated by contact to other parts of the body. Experiments show that it is indeed so, if the ring is sufficiently heavy. Some other thoughts are also presented. The noise carrying wave might be different from a surface wave with lateral component. Anyway, noises of this kind could possibly be easily prevented if one pays some caution not to rub a rather limited portion of the skin. A thin metal shield on top of the author's sensor reduced the room noise contamination remarkably, though it was originally to reduce electric noises. (author abst.) |
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