Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1976-01-05
1977-02-08
Woodiel, Donald O.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
338 42, G01L 902
Patent
active
040066410
ABSTRACT:
A method and apparatus for measuring fluid pressure by utilizing a plurality of resistor segments arranged in parallel in a normally opened electrical circuit. The apparatus includes a pair of spaced conductive plates and a compressible rubber-like pad interposed between the plates. The pad has a plurality of circular openings of differing diameters extending therethrough generally perpendicular to the conductive plates. A spherical contact element is located within each of the pad openings; and a respective resistor element is positioned to overly one end of each of the pad openings and to engage one of the conductive plates, the other of the conductive plates overlying the other end of each of the pad openings. The diameter of the spherical contact elements is less than the length of the pad openings so that under zero fluid pressure the contact elements do not simultaneously engage a respective resistor element and the second of the conductive plates, thereby defining a normally open circuit. The method of measuring fluid pressure includes compressing the pad in response to the pressure of the fluid, with that portion of the pad where a larger opening is located being initially compressed to a greater extent due to less pad material to resist deformation. As fluid pressure increases, the pad is compressed to a greater extent, and a greater number of spherical contact elements progressively make contact with both the second conductive plate and a respective resistor segment to progressively reduce the overall resistance of the system in substantially inverse proportion to the fluid pressure.
REFERENCES:
patent: 3525262 (1970-08-01), Goran
patent: 3786210 (1974-01-01), Byam
Dynamic Industries Inc.
Woodiel Donald O.
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