Development of defect investigation technique using multi channel detector

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The scattered light from the concrete surface has become speckle-like. Although the disorder of the phase distribution could be solvable by using a photo refractive type interferometer, spatial intensity distribution still exists and the signal noise ratio differs spatially. Then, signal light was spatially divided using the multi-channel optical detector, and it processed removing a channel with low sensitivity etc., and aimed at improvement in S/N ratio. In this detection, there was improvement in 1.9 times of S/N ratio.The basic experiment which measures the concrete surface by two dimensions and the elastic wave propagation on the surface of concrete visualizes was conducted. It was successful that vibration of the piezo actuator surface was measured by multi-channel optical detector.