Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1997-05-09
1999-10-26
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022718, 25022719, 25022723, 385 12, 356345, 73800, G01B 900, G01B 1116, H01J 500
Patent
active
059733179
ABSTRACT:
The present invention features an apparatus for detecting a shoulder load between two components in a drill string, comprising a pin connection, a box connection and a washer for sensing tensioning strain force therebetween. The pin connection has coupling means, and the box connection has corresponding coupling means for coupling to the pin connection to form a drill string. The washer is arranged between the pin connection and the box connection. The washer has embedded fiber optic Bragg Grating sensors that respond to a compressive strain shoulder load force when the pin connection is coupled to the box connection, and further responds to a light signal, for providing a compressive strain shoulder load force light signal containing information about a sensed compressive strain shoulder load force between the pin connection and the box connection in the drill string. The fiber optic Bragg Grating sensor may include either a Bragg Grating single point sensor, multiple Bragg Gratings, or a lasing element formed with pairs of multiple Bragg Gratings.
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CiDRA Corporation
Lee John R.
Westin Edward P.
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