US 11,733,111 B2
Field calibration for torsional vibration sensor
Daniel Farr, Gardnerville, NV (US); Lysle Turnbeaugh, Gardnerville, NV (US); and Trevor Cowan, Minden, NV (US)
Assigned to Baker Hughes Oilfield Operations LLC, Houston, TX (US)
Filed by Baker Hughes Oilfield Operations LLC, Houston, TX (US)
Filed on Jun. 16, 2021, as Appl. No. 17/349,374.
Application 17/349,374 is a continuation of application No. 16/512,008, filed on Jul. 15, 2019, granted, now 11,041,769.
Prior Publication US 2021/0381914 A1, Dec. 9, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G01L 3/10 (2006.01); G01L 25/00 (2006.01); G01H 1/00 (2006.01)
CPC G01L 3/10 (2013.01) [G01L 25/003 (2013.01); G01H 1/003 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for calibrating an output of a torsional vibration transducer, comprising:
receiving, by one or more processors, a plurality of zero-stress measurements of a shaft acquired by a torsional vibration transducer during rotation of the shaft about an axis of rotation and across a plurality of gaps between the torsional vibration transducer and the shaft, wherein the plurality of zero-stress measurements include at least a first zero-stress measurement at a near gap between the torsional vibration transducer and the shaft and a second zero-stress measurement at a far gap between the torsional vibration transducer and the shaft;
calculating, by the one or more processors, at least one calibration coefficient using the plurality of zero-stress measurements; and
calibrating, by the one or more processors, the output of the torsional vibration transducer according to the at least one calibration coefficient to reduce a sensitivity of the torsional vibration transducer to changes in gap between the torsional vibration transducer and the shaft when a torsional vibration of the shaft is measured.