Abstract
The system detecting crack on tunnel wall selectively by vehicle passing in tunnel has been proposed. That system consists of mechanoluminescence and TDI camera. In this paper, we report about the quantification of mechanoluminescence of crack due to pressure change, and the applicability of TDI camera to detecting mechanoluminescence of crack. Firstly, selective mechanoluminescence on crack due to pressure change is demonstrated. Experimental setup includes cylinder piston compressing enclosed space and test plate with simulated crack placed at bottom face of enclosed space. The surface of test plate with simulated crack is coated by mechanoluminescence particles. When a pressure change of 3.5 kPa occurs in enclosed space, the surface of test plate produces luminescence along the crack shape and luminescence value is 6 gray digits by CCD camera. Thus, mechanoluminescence of crack shape by pressure change is demonstrated. Secondly, detection of weak luminescence during moving is demonstrated. Experimental setup includes the rotating circular plate with luminous target on outer side. When the outer circumference rotates in 300 km/h, the target that luminescence value sets 6 gray digits corresponded by CCD camera is not detected by TDI camera. When the luminescence value is set to 300 times of 6 gray digits, it is detected by TDI camera. Thus, detection of mechanoluminescence of crack in 300 km/h movement by TDI camera is possible, if the strength of mechanoluminescence or sensitivity of TDI camera is enhanced by 300 times.
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