Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-05-20
1993-06-08
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022716, 25022721, 356 355, 356357, H01J 516
Patent
active
052181979
ABSTRACT:
A method and apparatus for the non-invasive sensing of the pressure within a pipe (or other vessel) is disclosed. An optical source produces a first light beam. This first light beam is split between a first (reference) and a second (measurement) optical fiber. The second optical fiber is associated with the pipe such that circumferential displacements in the pipe, due to changes in internal pressure, result in corresponding displacements in the length of the second optical fiber. Length changes in the optical fibers result in variations in the phase of the light emerging therefrom. The phase difference between the light beams emitted from the first and second optical fibers is then determined and related to changes in the internal pressure of the pipe.
REFERENCES:
patent: 4162397 (1979-07-01), Bucaro et al.
patent: 4238856 (1980-12-01), Bucaro et al.
patent: 4363114 (1982-12-01), Bucaro et al.
patent: 4418981 (1983-12-01), Stowe
patent: 4495411 (1985-01-01), Rashleigh
patent: 4552457 (1985-11-01), Giallorenzi et al.
patent: 4654520 (1987-03-01), Griffiths
patent: 4671659 (1987-06-01), Rempt et al.
patent: 4692610 (1987-09-01), Szuchy
patent: 4724316 (1989-02-01), Morton
patent: 4812014 (1989-03-01), Sawano et al.
patent: 4880970 (1989-11-01), Jones
patent: 4929050 (1990-05-01), Wilson
Jackson, "Monomide Optical Fibre Interferometers for Precision Measuremen Instrument Science and Technology, No. 735/85/120981, pp. 981-1001, 1985.
Summerscales, "Embedded Optical Sensors in Fibre Reinforced Plastics", Journal of Optical Sensors, vol 1, No. 4, pp. 287-296, 1986.
Davis et al, Fiberoptic Sensors Technology Handbook, published by Dynamic Systems, Inc. McLean, Va., pp. 4-1 through 5-22, 1982.
Kaiser Howard
Nelms David C.
Shami K.
The United States of America as represented by the Secretary of
LandOfFree
Method and apparatus for the non-invasive measurement of pressur does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for the non-invasive measurement of pressur, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for the non-invasive measurement of pressur will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1935769