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During the last decade, significant advances in the field of remote detection of ultrasound have taken place. Optical systems with increasing sensitivity for monitoring ultrasound on samples with optically rough surfaces have been developed, so that some designs are now moving from the research laboratory into industrial environments. In this review, a range of optical techniques is presented. These techniques are analysed regarding their use for the measurement of ultrasonic waves. Theydoi:10.1088/0957-0233/10/11/201 fatcat:kxaslr4hffcyrjwx3fcbll42ra