Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1982-12-03
1984-12-04
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
G01F 132
Patent
active
044856806
ABSTRACT:
A flow velocity measuring apparatus includes a vortex-generating member disposed in the flow path and a temperature-resistance converting element positioned in contact with vortexes produced at the downstream side. A bridge circuit includes as one side the temperature-resistance converting element, and an amplifier circuit amplifies the output of the bridge circuit to provide a detection signal having a frequency corresponding to the periodic change in temperature of the element due to cooling action of the vortexes. A comparator provides one of a high level or a low level at the input end of the amplifier circuit to keep the temperature-resistance converting element at a first temperature when the level of the detection signal is lower than a prescribed preset value and provides the other of a high level or a low level at the input of the amplifier circuit to maintain the element at a second temperature higher than the first temperature when the level of the detection signal is higher than the prescribed preset value.
REFERENCES:
patent: 3564915 (1971-02-01), Tomota et al.
patent: 4386520 (1983-06-01), Nagaishi
Goldstein Herbert
Mitsubishi Denki & Kabushiki Kaisha
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