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Absbct --We have designed an all optical high-sensitiviy pressure sensor based on afiber Bragg grating (FBG) encapsulated in a polymer-halfitillid metal cylinder with the sensitivity o f 1 . 8 7~1 0~~M p a~' . This sensor should be appliedpotentially for the measurement of mediumspressure, liquid level and depth underwater: A number of configurations of FBG pressure sensors have been demonstrated [I]-[5]. In this paper, we

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