Bolt load determining apparatus

Details Bolt load determining apparatus Bolt load determining apparatus

G - Physics

01

L

354/28

G01L 1/00 (2006.01) G01L 1/25 (2006.01) G01L 5/24 (2006.01)

Patent

CA 1182565

ABSTRACT A first signal at a first frequency which is a selected harmonic of the resonant frequency of a bolt in a first loaded condition is determined. Then there is determined a second signal at a second fre- quency being the same harmonic of the resonant fre- quency of the bolt in a second loaded condition. Both frequencies are multiplied by a factor M. The up input of a counter receives one of the signals for a predetermined duration, and the down input re- ceives the other signal for the same duration. The number of pulses remaining in the counter is repre- sentative of the difference in load between the first and second loaded conditions.

417845

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