Abstract
We have developed the Mach-Zehnder interferometer type optical fiber AE sensor that has portability by adhering the optical fiber to a polycarbonate block. The aim of this research is to improve the sensitivity and the directivity of the sensor. It is demonstrated that by increasing the number of sensing regions, the difference of the sensitivity against the directions tends to disappear. It is also found that the absolute sensitivity of the sensor is described by the sinusoidal function.
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