All-optical photoacoustic sensors for steel rebar corrosion monitoring

Published 2018

Cong Du The University of Massachusetts Lowell

Qixiang Tang University of Massachusetts Lowell

Xu Guo PhD in Electrical and Computer Engineering, UMass Lowell

Jingcheng Zhou Postdoc, UC San Diego; PhD, UMass

Tzuyang Yu Associate Professor of Civil Engineering, UMass Lowell

DOI: 10.3390/s18051353

Abstract:

This article presents an application of an active all-optical photoacoustic sensing system with four elements for steel rebar corrosion monitoring. The sensor utilized a photoacoustic mechanism of gold nanocomposites to generate 8 MHz broadband ultrasound pulses in 0.4 mm compact space. A nanosecond 532 nm pulsed laser and 400 μm multimode fiber were employed to incite an ultrasound reaction. The fiber Bragg gratings were used as distributed ultrasound detectors. Accelerated corrosion testing was applied to four sections of a single...

Excerpt:

Finally, an ultraviolet glue (365A, Agiltron, Woburn, MA, USA) was covered on the fibers for protection...