2A2-P24 Concrete surface strain measurement using a strain visualization sticker(Non-contact Sensing)

Abstract

This paper proposes a strain visualization sticker using a moire fringe which can display characters and fringe that correspond to a magnitude of strain without the use of electronic elements, such as amplifiers, strain gauges and wires. The sticker makes it possible to read the rough strain value of the concrete surface directly by visual inspection and enable remote, noncontact measurement of strain using a camera. The structure of the sticker is simple and its fabrication is inexpensive. The results show that the sticker provides the strain information by characters and accurate numerical value of the strain using image processing.