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概要

FOD (Fiber Optical Doppler) sensor, that can measure elastic wave in wide-band frequency, has been developed, which utilizes Laser Doppler effect within an optical fiber. In particular, FOD sensor can detect Acoustic Emission (AE), which is a useful parameter to monitor in-situ damage at various industrial equipments. AE is caused mainly by very initial micro-crack within a structural material due to over-stress, material-aging, etc. When taking advantage of fiber-optics, that are long signal transmission capacity, immune to electro-magnetic noise, and water-resistive, we will be able to take into account remote condition-monitoring in the industry, which enables us to implement damage screening where/when to inspect precisely or to repair. Report herein describes its measurement principle and 3(three) sample applications of monitoring on field, that are rock collapse, corrosion under insulation, and metal thickness.

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