High temperature acoustic levitator

Details High temperature acoustic levitator High temperature acoustic levitator

1983-08-26

1984-08-07

Gill, James J.

Measuring and testing

Speed, velocity, or acceleration

Angular rate using gyroscopic or coriolis effect

F16C 3200

Patent

active

044636067

ABSTRACT:
A system is described for acoustically levitating an object (12, FIG. 1) within a portion of a chamber (14) that is heated to a high temperature, while a driver (22) at the opposite end of the chamber is maintained at a relatively low temperature. The cold end of the chamber is constructed so it can be telescoped to vary the length (L.sub.1) of the cold end portion and therefore of the entire chamber, so that the chamber remains resonant to a normal mode frequency, and so that the pressure at the hot end of the chamber is maximized. The precise length of the chamber at any given time, is maintained at an optimum resonant length by a feedback loop. The feedback loop includes an acoustic pressure sensor (42) at the hot end of the chamber, which delivers its output to a control circuit (44), which controls a motor (36) that varies the length (L) of the chamber to a level where the sensed acoustic pressure is a maximum.

REFERENCES:
patent: 3882732 (1975-05-01), Fletcher

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