Grain sensor using a piezoelectric element

Details Grain sensor using a piezoelectric element Grain sensor using a piezoelectric element

1981-04-03

1983-08-30

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310328, 310330, H01L 4108

Patent

active

044019092

ABSTRACT:
A grain sensor comprises a piezoelectric element mounted to a rear surface of a relatively thin, flat sounding board of substantially greater surface area than the piezoelectric element. Forces experienced by the sounding board due to grain particles impinging upon the front surface thereof are imparted to the piezoelectric element. A rigid frame surroundingly engages side edges of the sounding board. The rigid frame includes an inwardly extending flange for substantially covering a peripheral edge portion of the front surface. A base member having a surface substantially congruent with the sounding board surfaces is mounted in facing relation to the rear sounding board surface for substantially enclosing the piezoelectric element therebetween. A resilient seal and spacer member is interposed between the facing surfaces of the sounding board and the base member.

REFERENCES:
patent: 2561763 (1951-07-01), Waters et al.
patent: 3618062 (1971-11-01), Ott
patent: 3844174 (1974-10-01), Chabre
patent: 3863250 (1975-01-01), McCluskey, Jr.
patent: 4012604 (1977-03-01), Speidel
patent: 4079362 (1978-03-01), Grimm et al.
patent: 4110654 (1978-08-01), Paul

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