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Non-destructive evaluation of the inner surface of a tunnel using an optical technique, such as laser speckle interferometry, that allows the surface to be quickly and reliably evaluated from inside the tunnel
Non-destructive evaluation of the inner surface of a tunnel using an optical technique, such as laser speckle interferometry, that allows the surface to be quickly and reliably evaluated from inside the tunnel
Method for testing tunnel walls for cracks and cavities in the wall surface uses an optical, contactless measurement method for detection of deformation of the wall inner wall. Possible measurement methods include speckle interferometry, such as laser or electronic speckle interferometry, electronic speckle pattern interferometry, DSPI, shearography or holography. An Independent claim is made for a device for detection of the 3-D form and shape of the inner surface of a tunnel wall comprises a speckle interferometer with a laser light source, and a camera detection device.
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