Sensors 2012, 12(9), 12265-12278; doi:10.3390/s120912265
Article

A Synthetic Phased Array Surface Acoustic Wave Sensor for Quantifying Bolt Tension

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Received: 10 July 2012; in revised form: 27 August 2012 / Accepted: 4 September 2012 / Published: 7 September 2012
(This article belongs to the Special Issue Last Trends in Acoustic Sensing)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: In this paper, we report our findings on implementing a synthetic phased array surface acoustic wave sensor to quantify bolt tension. Maintaining proper bolt tension is important in many fields such as for ensuring safe operation of civil infrastructures. Significant advantages of this relatively simple methodology is its capability to assess bolt tension without any contact with the bolt, thus enabling measurement at inaccessible locations, multiple bolt measurement capability at a time, not requiring data collection during the installation and no calibration requirements. We performed detailed experiments on a custom-built flexible bench-top experimental setup consisting of 1018 steel plate of 12.7 mm (½ in) thickness, a 6.4 mm (¼ in) grade 8 bolt and a stainless steel washer with 19 mm (¾ in) of external diameter. Our results indicate that this method is not only capable of clearly distinguishing properly bolted joints from loosened joints but also capable of quantifying how loose the bolt actually is. We also conducted detailed signal-to-noise (SNR) analysis and showed that the SNR value for the entire bolt tension range was sufficient for image reconstruction.
Keywords: bolt tension; real area of contact; non-destructive testing; surface acoustic wave sensor; synthetic phase array; ultrasonic imaging
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MDPI and ACS Style

Martinez, J.; Sisman, A.; Onen, O.; Velasquez, D.; Guldiken, R. A Synthetic Phased Array Surface Acoustic Wave Sensor for Quantifying Bolt Tension. Sensors 2012, 12, 12265-12278.

AMA Style

Martinez J, Sisman A, Onen O, Velasquez D, Guldiken R. A Synthetic Phased Array Surface Acoustic Wave Sensor for Quantifying Bolt Tension. Sensors. 2012; 12(9):12265-12278.

Chicago/Turabian Style

Martinez, Jairo; Sisman, Alper; Onen, Onursal; Velasquez, Dean; Guldiken, Rasim. 2012. "A Synthetic Phased Array Surface Acoustic Wave Sensor for Quantifying Bolt Tension." Sensors 12, no. 9: 12265-12278.

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