Arrangement for detecting an object by means of sound conducted through a solid body and method of using such arrangement
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United States of America Patent
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Nov 30, 1993
Grant Date -
N/A
app pub date -
Sep 9, 1991
filing date -
Jan 12, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for detecting an impact sound, such as a sound caused by a railroad vehicle approaching a construction location. The apparatus comprises an arrangement for detecting impact sound or vibrations with a receiver mounted at the rail, for example, and, further, an evaluation circuit for processing the vibrations and triggering a warning signal when the intensity of the receiver-output signal continuously increases, for example, when the intensity in a predetermined frequency range passes through predetermined threshold values during predetermined times. Thus, an approaching railroad vehicle can be positively detected by monitoring a continuously increasing sound or vibration which is propagated in the rails.
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