Measuring and testing – Miscellaneous
Patent
1976-10-04
1978-02-14
Ruehl, Charles A.
Measuring and testing
Miscellaneous
73170R, 73DIG4, 310334, G01N 1500
Patent
active
040731936
ABSTRACT:
A transducer device and a system incorporating said transducer device useful, for example, for measuring a characteristic of particles in a particle flow stream. The transducer device comprises a front surface solid element in which an elastic wave is created, for example, on impact of a particle on an exposed front surface; a liquid medium; a thin piezoelectric sensing element; a solid back surface element; and a housing to hold the front and back surface elements in spaced relation with the liquid medium therebetween. Elastic waves created at the front surface are propagated through the piezoelectric element. The acoustic configuration of the transducer device is such that the electrical output signal of the thin piezoelectric is indicative of some characteristic of the first and the fastest pulse of the elastic wave. Systems including the transducer device comprise circuitry for processing the output of the piezoelectric transducer including, for example, amplifiers, filters, peak detectors, counters, rate meters, zero crossing detectors, etc. which provide an output characteristic, for example, of number, momentum, energy, mass, size and/or velocity of particles striking the front surface.
REFERENCES:
patent: 3159029 (1964-12-01), Ruderman
patent: 3179823 (1965-04-01), Nesh
patent: 3365593 (1968-01-01), Roof et al.
patent: 3830103 (1974-08-01), Andrejkovics et al.
patent: 3844174 (1974-10-01), Chabre
Modlo et al., "Ultrasonic Pressure & Frequency Analyzer"- IBM Technical Disclosure Bulletin- vol. 14, No. 3, Aug. 1971, pp. 850-851.
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