G01L 5/246(20130101), F16B 31/02(20130101), F16B 2031/022(20130101), G01L 3/1428(20130101), G01L 5/24(20130101), G01N 29/07(20130101), G01N 2291/0422(20130101), G01N 2291/2691(20130101)
A synthetic phased array surface acoustic wave sensor to quantify bolt tension and a method for determining or estimating the tension in bolts using surface acoustic waves (SAWs). The tension is determined or estimated by using the reflection of SAWs created by the bolt head interference with the underlying surface. Increments in the bolt tension raise the points of interaction between the waves and the bolt head (real area of contact), and hence the position of the reflective boundaries. The variations are estimated using known techniques (e.g., linear synthetic array imaging technique). A singular transducer is actuated from predefined positions to produce an array of signals that are subsequently arranged and added to construct an acoustic image.
Guldiken, Rasim Oytun and Martinez Garcia, Jairo Andres, "Active ultrasonic method of quantifying bolt tightening and loosening" (2015). USF Patents. 55.
University of South Florida