초록 ▼

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 shap

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.

대표청구항 ▼

1. An ultrasonic acoustic calibration device, comprising:a plurality of media particles; an upper chamber, a lower chamber and a neck disposed therebetween for connecting said upper and lower chambers, said media particles being located in at least one of said chambers, said neck allowing controlled

1. An ultrasonic acoustic calibration device, comprising:a plurality of media particles; an upper chamber, a lower chamber and a neck disposed therebetween for connecting said upper and lower chambers, said media particles being located in at least one of said chambers, said neck allowing controlled passage of the media particles due to gravity; and an impingement post disposed within at least one of said upper chamber and the lower chamber so as to be contacted by a media particle pulling through said neck such that a sound results when one of the media particles makes contact with the impingement post wherein the resulting sounds from the plurality of media particles making contact with the impingement post are reproducible and repeatable sounds used as a standard for ultrasonic calibration.