Next Article in Journal
Flow Cell Design for Effective Biosensing
Previous Article in Journal
Mobile Devices for Community-Based REDD+ Monitoring: A Case Study for Central Vietnam
Article Menu

Export Article

Open AccessArticle
Sensors 2013, 13(1), 39-57;

Fiber Loop Ringdown Sensor for Potential Real-Time Monitoring of Cracks in Concrete Structures: An Exploratory Study

Department of Physics and Astronomy, Mississippi State University, Starkville, MS 39762, USA
Author to whom correspondence should be addressed.
Received: 7 October 2012 / Revised: 21 November 2012 / Accepted: 17 December 2012 / Published: 20 December 2012
(This article belongs to the Section Physical Sensors)
Full-Text   |   PDF [633 KB, uploaded 21 June 2014]   |  


A fiber loop ringdown (FLRD) concrete crack sensor is described for the first time. A bare single mode fiber (SMF), without using other optical components or chemical coatings, etc., was utilized to construct the sensor head, which was driven by a FLRD sensor system. The performance of the sensor was evaluated on concrete bars with dimensions 20 cm × 5 cm × 5 cm, made in our laboratory. Cracks were produced manually and the responses of the sensor were recorded in terms of ringdown times. The sensor demonstrated detection of the surface crack width (SCW) of 0.5 mm, which leads to a theoretical SCW detection limit of 31 μm. The sensor’s response to a cracking event is near real-time (1.5 s). A large dynamic range of crack detection ranging from a few microns (μm) to a few millimeters is expected from this sensor. With the distinct features, such as simplicity, temperature independence, near real-time response, high SCW detection sensitivity, and a large dynamic range, this FLRD crack sensor appears promising for detections of cracks when embedded in concrete. View Full-Text
Keywords: fiber loop ringdown; crack sensors; concrete fiber loop ringdown; crack sensors; concrete

Figure 1

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

Share & Cite This Article

MDPI and ACS Style

Sahay, P.; Kaya, M.; Wang, C. Fiber Loop Ringdown Sensor for Potential Real-Time Monitoring of Cracks in Concrete Structures: An Exploratory Study. Sensors 2013, 13, 39-57.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top