This paper presents the implementation of a long-term wireless ultrasonic thickness measurement system on an in-service steel bridge. Developed on the Martlet wireless sensing platform, a wireless ultrasonic thickness measurement device is added with the capacity of high-voltage excitation, filtering/amplification of the received ultrasonic signal, and high-speed sampling (~80 MHz). Martlet ultrasonic thickness devices as well as 2.25MHz dual-element transducers are installed on a steel bridge in western Georgia, USA. The thickness measurements are taken at scheduled time intervals for long-term monitoring. A gateway server installed on-site collects ultrasonic data samples from Martlet units and uploads data into the cloud. Thickness values are calculated automatically using the autocorrelation of the ultrasonic data.

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Yu Otsuki, Korawat Sakpunpanom, and Yang Wang, "Long-term ultrasonic thickness measurement on an in-service bridge through a wireless sensor network," Proc. SPIE 12486, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2023, 124860W (Presented at SPIE Smart Structures + Nondestructive Evaluation: March 15, 2023; Published: 18 April 2023); https://doi.org/10.1117/12.2657802.