Abstract
A digital holographic technique has been applied to a measurement of an inner surface profile of a pipe. Wavelength change brought by an injection-current change of a laser diode is used for a surface contouring. To illuminate the pipe inner surface, a cone-shaped mirror is inserted into the pipe. The shape of two pieces of metal sheet pasted on the inner surface and a hole made in the wall can be detected by scanning the mirror along the longitudinal direction of the pipe and evaluated with a digital image processing. It is shown that the proposed method can visualize and detect three dimensional shape of defects on the inner surface of pipes for an inspection.
© 2011 Optical Society of America
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