Ultrasonic standard
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United States of America Patent
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Jan 29, 2002
Grant Date -
N/A
app pub date -
Dec 10, 1999
filing date -
Dec 10, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention provides a device that generates predictable and reproducible sounds. The device according to the invention serves as a standard to calibrate ultrasonic measuring equipment through either a gaseous medium or a solid medium. The device according to the invention is similar in basic shape to an hourglass or venturi (e.g., a sand-type egg-timer), but instead of using fine particles, such as sand, the device includes identical media particles (e.g., marbles, balls, beads, etc.) which drop from an upper chamber to a lower one. The media particles are pre-sorted so that those sealed within the hourglass structure are uniform. An impingement post (e.g., a bell or sounding plate) is positioned in the path of the falling media particles so that each will hit the sounding plate, resulting in a reverberating sound. The impingement post is cantilevered and supported from a side of a chamber of the hour glass structure.
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