Pressure sensor

Details Pressure sensor Pressure sensor

1994-12-14

1996-09-24

Chilcot, Richard

Measuring and testing

Fluid pressure gauge

Vibration type

G01L 1100

Patent

active

055579710

ABSTRACT:
A pressure sensor for detecting engine knocking includes a diaphragm 40, and a pressure transmitting medium 10 filled between a pressure sensing element 5 and the diaphragm. The diaphragm has a diameter d and a plate thickness t for enabling the diaphragm to have a resonant frequency substantially equal to the frequency of an abnormal pressure vibration; the diameter d and the plate thickness t satisfy the formula t=Kd.sup.2, where K=3.3.times.10.sup.4 .about.5.3.times.10.sup.4.

REFERENCES:
patent: 3745384 (1973-07-01), Blanchard
patent: 4233836 (1980-11-01), Yoneda et al.
patent: 5123282 (1992-06-01), Ikeda et al.
patent: 5212989 (1993-05-01), Kodama et al.
U.S. application Ser. No. 08/012,401, filed Feb. 2, 1993, Fumito Uemura, entitled Pressure Sensor.

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