Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1990-08-10
1991-04-09
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
307358, G01F 132
Patent
active
050054279
ABSTRACT:
A Karman vortex flowmeter which comprises, in addition to a conventional vortex frequency detector for outputting an electrical signal including a vortex frequency signal component, a filter group consisting of a plurality of filters having a gradation of pass bands covering the variation range of the vortex frequency, and a waveform shaper circuit coupled to the output of the filter group for forming a pulse-shaped signal having a frequency equal to the vortex frequency. A filter in the filter group is selectively coupled to the shaper circuit in response to the output frequency thereof. The shaper circuit, on the other hand, holds the peak and the bottom level of the electrical signal; compares them with the positively and the negatively shifted electrical signal, respectively; and sets and resets a flip-flop when the peak and the bottom level cross with the positively and the negatively shifted electrical signal, respectively, the peak and the bottom level being reset after each occurrence of the crossing. The flip-flops outputs a pulse-shaped signal having the vortex frequency even if the electrical signal contains high and low frequency noise components.
REFERENCES:
patent: 4334426 (1982-06-01), Kita et al.
patent: 4535294 (1985-08-01), Ericksen et al.
patent: 4634895 (1987-01-01), Luong
Goldstein Herbert
Mitsubishi Denki & Kabushiki Kaisha
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