| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve the problem that the measurement value of the central wavelength is largely deviated by the external radio noise invaded into a light receiving element in a wave length detector. <P>SOLUTION: Two fiber Bragg grating (FBG) of high reflectivity having the same reflection wave length band are connected by an optical fiber to be made for making a first interference sensor of the fiber Fabry-Perot type. An FBG having a different wave length band from that of the interference sensor is made to be a second fiber Fabry-Perot type interferometer. In the same manner, the plurality of interference sensors of the fiber Fabry-Perot type is constituted by serial connection with one optical fiber. On the one end of this fiber a reflection mirror is provided and the light from the broad band light source is made incident on through the light branching coupler or the light circulator. Further, the emission outgoing light is made incident on the light wave length detector through the light branching coupler or the light circulator. By the light wave length detector the reflection wave length linking with the physical quantity of each sensor of the plurality of sensors such as temperature or distortion can be detected with good SN. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
