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14 February 2005 Optical fiber null coupler sensor for damage detection using ultrasonic
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A novel optical fiber null coupler (OFNC) sensor based on acousto-optic interaction is developed, which can be used in the structure health monitoring of the medical materials. The OFNC sensors can be response to 10MHz supersonic wave, and their signal-to noise ratio are higher then Piezo Ceramic Transducers(PZT). A kind of Perspex with a 1mm hole is employed as the sample, where the OFNC sensor is glued on, and the reflected signal of ultrasonic wave by the hole is detected .
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HaiFeng Xuan, Yanbiao Liao, Ming Zhang, and Shu Rong Lai "Optical fiber null coupler sensor for damage detection using ultrasonic", Proc. SPIE 5634, Advanced Sensor Systems and Applications II, (14 February 2005);

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