US 11,982,648 B2
Active waveguide excitation and compensation
Oleg Lobkis, Mason, OH (US); Richard A. Roth, Goshen, OH (US); Christopher G. Larsen, Cincinnati, OH (US); and Stuart J. Shelley, Cincinnati, OH (US)
Assigned to Etegent Technologies, Ltd., Cincinnati, OH (US)
Filed by Etegent Technologies, Ltd., Cincinnati, OH (US)
Filed on Nov. 30, 2020, as Appl. No. 17/107,646.
Application 17/107,646 is a division of application No. 15/302,836, granted, now 10,852,277, previously published as PCT/US2015/025043, filed on Apr. 9, 2015.
Claims priority of provisional application 61/977,302, filed on Apr. 9, 2014.
Prior Publication US 2021/0372971 A1, Dec. 2, 2021
Int. Cl. G01L 11/06 (2006.01); F01D 17/08 (2006.01); G01H 11/00 (2006.01); G01L 1/10 (2006.01); G01L 1/25 (2006.01); G01N 29/07 (2006.01); G01N 29/12 (2006.01); G01N 29/24 (2006.01); G01N 29/32 (2006.01); G01P 15/097 (2006.01); G01P 15/10 (2006.01); F01D 17/02 (2006.01)
CPC G01N 29/326 (2013.01) [F01D 17/08 (2013.01); F01D 17/085 (2013.01); G01H 11/00 (2013.01); G01L 1/10 (2013.01); G01L 1/255 (2013.01); G01L 11/06 (2013.01); G01N 29/07 (2013.01); G01N 29/12 (2013.01); G01N 29/2462 (2013.01); G01P 15/10 (2013.01); F01D 17/02 (2013.01); F05D 2220/32 (2013.01); G01L 1/106 (2013.01); G01N 2291/0215 (2013.01); G01N 2291/02827 (2013.01); G01N 2291/02872 (2013.01); G01N 2291/02881 (2013.01); G01N 2291/0421 (2013.01); G01N 2291/0422 (2013.01); G01N 2291/0426 (2013.01); G01N 2291/0427 (2013.01); G01P 15/097 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of measuring an environmental condition with a sensor of the type that includes a wire having an ultrasonic signal transmission characteristic that varies in response to the environmental condition, the method comprising:
sensing a resonant frequency of ultrasonic energy propagated through the wire in a positive feedback loop while at least a portion of the wire is subjected to the environmental condition; and
determining a value for the environmental condition based upon the sensed resonant frequency.