Positive and negative pressure sensor

Details Positive and negative pressure sensor Positive and negative pressure sensor

2005-06-07

2005-06-07

Oen, William (Department: 2855)

Measuring and testing

Fluid pressure gauge

Diaphragm

Reexamination Certificate

active

06901807

ABSTRACT:
A device for sensing pressure using two perforated rigid films in which a diaphragm is mounted between the first two films. The device senses positive and negative pressure through a port or opening to the region for which pressure data is desired. The device communicates capacitive pressure and changes in that pressure. The flexible diaphragm is spaced from the first and second films such that the flexible diaphragm is adapted to flex toward the first film when pressure increases in the opening and is adapted to flex toward the second film when pressure decreases in the opening to change the capacitance between the diaphragm and at least one of the first and second films. Spacers are used to position all three elements.

REFERENCES:
patent: 4606228 (1986-08-01), Whitmore
patent: 5679902 (1997-10-01), Ryhanen

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