Communications – electrical: acoustic wave systems and devices – Signal transducers
Patent
1989-07-21
1990-10-23
Jordan, Charles T.
Communications, electrical: acoustic wave systems and devices
Signal transducers
73721, 73727, 310328, H04R 1700
Patent
active
049657771
ABSTRACT:
The transducer comprises a support structure carrying piezoresistive sensors, particularly of the thick-film type, which are intended to be resiliently deformed by the fluid pressure to be measured and to provide an electrical signal indicative of the value of the pressure. The support structure comprises a substantially mushroom-shaped metal body with a head and a shank. An axial blind hole is formed in the shank and is intended to contain the fluid whose pressure is to be measured. The hole also extends into the head and, with the end surface of the head, defines a wall which is resiliently deformable by the pressure to be measured. The piezoresistive sensors are connected to the end surface of the head of the mushroom-shaped body in correspondence with or adjacent the deformable wall so that they can in turn be deformed as a result of the deformation of the wall. The piezoresistive sensors are deposited on a thin plate fixed to the upper surface of the head of the mushroom-shaped body. The plate also carries the components of the circuits for amplifying and processing the signals generated by the sensors. A metal structure is also connected to the mushroom-shaped body to screen it from radio-frequency interference.
REFERENCES:
patent: 4129042 (1978-12-01), Rosvold
patent: 4168630 (1979-09-01), Shirouzu et al.
patent: 4373399 (1983-02-01), Beloglazov et al.
patent: 4399707 (1983-08-01), Wamstad
patent: 4411158 (1983-10-01), Schaff, Jr.
patent: 4516430 (1985-05-01), Kurtz et al.
patent: 4683755 (1987-08-01), Samek
patent: 4726233 (1988-02-01), Eckardt et al.
patent: 4732044 (1988-03-01), Dell'Acqua et al.
Rossi Giuseppina
Timossi Gian Maria
Eldred J. Woodrow
Jordan Charles T.
Marelli Autronica S.p.A.
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