G - Physics – 01 – L
Patent
G - Physics
01
L
G01L 5/00 (2006.01) F16K 37/00 (2006.01) G01L 5/10 (2006.01) G01L 5/24 (2006.01)
Patent
CA 2179689
A method for detecting the integrity of a bond between strain gages and the circumferential surface of a rod having an intended use comprises bonding at least four strain gages to the surface of the rod in a predetermined orientation, each of the strain gages being connected to a separate strain gage bridge circuit. The rod is used for its intended use and each of the strain gage bridge circuit outputs a plurality of instantaneous first, second, third and fourth output signals, each being associated with one of the strain gages. A plurality of instantaneous bonding values are calculated from the output signals equal to the sum of the first signal and the fourth signal minus the sum of the second signal and the third signal. If the instantaneous bonding values remain constant, the bond integrity of the strain gages is good whereas if the bonding values are not constant, the bond integrity of at least one of the strain gages is poor.
Gowling Lafleur Henderson Llp
Liberty Technologies Inc.
LandOfFree
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