[15a-P4-1~13] 1.5 Instrumentation, measurement and Metrology

[15a-P4-10] Detection of water leakage on concrete walls by near infrared LIDAR

〇Takeharu Murakami¹, Norihito Saito¹, Yuichi Komachi¹, Takashi Michikawa¹, Kotaro Okamura¹, Michio Sakasita¹, Shigeru Kogure¹, Kiwamu Kase¹, Satoshi Wada¹, Katsumi Midorikawa¹ (1.RIKEN RAP)

Keywords:LIDAR, Infrastructure

We have constructed a short distance LIDAR for crack detection and spectroscopic measurement of concrete walls. We then have demonstrated that it is possible to measure an amount of water on remote walls by analyzing the difference in absorbance at two near infrared wavelengths.
It was found that we can remove specular scattering component coming from the surface of the water by utilizing depolarization effect on the concrete surface.