Hall-Effect Sensors for Real-Time Monitoring Pier Scour

National Applied Research Laboratories, National Chip Implementation Center,
7F, No. 26, Prosperity Rd. I, Science Park, Hsinchu City, Taiwan
Tel.: +886-3-557-3693, fax: +886-3-668-7035

^* E-mail: ccchen@cic.narl.org.tw

Received: 14 November 2014 /Accepted: 15 December 2014 /Published: 31 January 2015

Abstract: Scour around bridge pier is a major cause of bridge failure such as collapse resulted in loss of life and property. Most of available sensors and approaches for monitoring bridge pier scour are very expensive, which is a main challenge for mass deployment of numerous bridges. Our proposed scour monitoring system utilized low-cost commercial sensors, hall-effect sensors (unit price< $1) that are capable of real-time measuring bridge pier scour with resolution of ~ 2.5 cm, and overall cost for single sensor node of our proposed work is at least 40 % less expensive than existing work. The hall- effect sensor is evaluated under controlled conditions in two laboratory flumes. After scour event, the typical voltage change of the hall-effect sensor is ~ 300 mV, and the system achieve signal-to-noise ratio performance of ~ 60 dB. Finally, we also provide an equation to predict the time variation of scour depth around pier model. Moreover, the master-slave architecture of bridge pier scour monitoring system has scalability and flexibility for mass deployment. This technique has the potential for further widespread implementation in the field.

Keywords: Bridge, Pier, Scour, Sensor, Hall-effect.

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