Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1993-12-21
1996-01-09
Chilcot, Richard
Measuring and testing
Fluid pressure gauge
Diaphragm
73705, 73717, 73724, 73728, 25023119, G01L 708, G01L 900
Patent
active
054819199
ABSTRACT:
A pressure transmitter converts input pressures on the order of 0.000.15 inch of water column to proportional electrical output signals. A housing defines an open internal chamber and a substantially constant area shaped membrane spans the chamber and is secured about its perimeter thereto, dividing it into a convex side and a concave side. The convex side of the membrane forms an input side adapted to receive an input pressure. A beam is mounted for pivotal movement on the concave side of the membrane. One end of the beam supports a mechanical column which contacts the membrane and asserts a slight upward force on it. The opposite end of the beam mounts a reflector which is mounted directly over a photomicrosensor which outputs a voltage signal proportional to the movement of the reflector. A second photomicrosensor outputs a constant reference output voltage. A comparator receives both photomicrosensor outputs and outputs a voltage signal proportional to the difference therebetween. Thus, a pressure applied to the convex side of the membrane is converted to a proportional voltage output signal.
REFERENCES:
patent: 3100999 (1963-08-01), Andresen, Jr.
patent: 4049935 (1977-09-01), Gruber
patent: 4604633 (1986-08-01), Kimura et al.
patent: 4687927 (1987-08-01), Iwamoto et al.
patent: 4928529 (1990-05-01), Brandt, Jr.
Chilcot Richard
Felber Joseph L.
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