In this paper, a preliminary study on the development of a wireless image-based sensor for two-dimensional (2D) crack propagation monitoring is reported. This sensor contains an optical navigation sensor board (ADNS-9500) which is incorporated into the Imote2 IPR2400 platform. To monitor crack propagation, the Imote2 sends a signal to the ADNS-9500 to switch on the built-in laser and camera collecting images reflected from the concrete surface. The captured images are processed by motion estimation methods to obtain the relative displacement between images. A series of tests have been conducted to calibrate the accuracy of the proposed crack sensor. Results show that the crack sensor can track linear motion and sinusoidal motion quiet well under some a range of speed.
In this paper, a preliminary study on the development of a wireless image-based sensor for two-dimensional (2D) crack
propagation monitoring is reported. This sensor contains an optical navigation sensor board (ADNS-9500) which is
incorporated into the Imote2 IPR2400 platform. To monitor crack propagation, the Imote2 sends a signal to the
ADNS-9500 to switch on the built-in laser and camera collecting images reflected from the concrete surface. The captured
images are processed by an optical flow method to obtain the relative displacement between images. A series of tests
have been conducted to calibrate the accuracy of the proposed crack sensor. Results show that the crack sensor exhibits a
strong linearity under 2D movement and can track the movement quiet well.
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