Measuring and testing – Fluid pressure gauge – Photoelectric
Patent
1980-08-27
1982-04-06
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Photoelectric
73723, 356376, G01L 900
Patent
active
043229786
ABSTRACT:
An optical device for measuring both slight positive and negative pressure differences by means of a light intensity change characterized by a gradient lens having a first and second end face being mounted in a housing part with a second end face spaced from a partially reflective membrane which is secured to the housing part to form a first chamber of a first volume and a second chamber of a second volume. An input waveguide such as an optical fiber is connected to a light source and is connected to the first end face of the lens and a pair of output waveguides are coupled to the first end face at two points displaced from the input fiber and a separate light intensity evaluation device connected to each of the output waveguides so that both positive and negative changes in pressure between the two chambers causes the membrane to be flexed and cause a reflective surface to move from a parallel position to cause a reflected image point of the input waveguide to move along the first end face with positive changes of pressure cause an increase of the intensity of the light being received by the one output waveguide and a negative pressure change causing the increased intensity in the other waveguide.
REFERENCES:
patent: 3215135 (1965-11-01), Franke
patent: 3273447 (1966-09-01), Frank
patent: 3503116 (1970-03-01), Strack
Siemens Aktiengesellschaft
Woodiel Donald O.
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