Measuring and testing – Fluid pressure gauge – Photoelectric
Patent
1990-01-30
1991-04-23
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Photoelectric
25022714, 25023119, G01L 704
Patent
active
050091077
ABSTRACT:
An optical absolute pressure sensor constituted by a body made of a substance having photoelastic properties and provided with at least one internal duct extending parallel to the longitudinal direction of said body, the pressure inside said duct being substantially zero and the ends thereof being closed in sealed manner. The invention also applies to a method of making the sensor, to apparatus for implementing the method, and to a sensor constituting the product of the method.
REFERENCES:
patent: 3273447 (1966-09-01), Frank
patent: 4612810 (1986-09-01), Martens
Asman Sanford J.
Schlumberger Industries
Woodiel Donald O.
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