TILTMETER USING FBG OPTICAL FIBER SENSOR

PROBLEM TO BE SOLVED: To provide a tiltmeter capable of reducing the number of transmission cables to be laid even in the case that simultaneous measurement over a wide area, extending a transmission maximum distance, and being constituted at inexpensive costs by constituting the tiltmeter of an FBG system (fiber grating system) optical fiber sensor. SOLUTION: The tiltmeter comprises both a measuring part and a fixture. The measuring part is provided with a casing; a weight holding member fixed to a ceiling surface inside the casing and having flexibility; a weight; a first fiber grating part installed on an outer circumferential surface of the weight holding member toward the direction of the axis of the weight holding member; at least one second fiber grating part installed toward the direction of the axis of the weight holding member; and an optical fiber for transmission for transmitting measurement signals from the first fiber grating part and the second fiber grating part. The fixture is used to fix both sides of the first fiber grating part and the second fiber grating part to the weight holding member. COPYRIGHT: (C)2007,JPO&INPIT