光纖光柵傾斜儀之研發與改進

Abstract

為了進行海氣象觀測塔結構之監測，以及離岸監測相關技術經驗累積。採用具抗潮濕、不怕雷擊、不易受電磁波干擾，且能於單一線路上進行多點量測等優點之光纖光柵感測器進行監測。本研究主要目的在研發與改良光纖光柵傾斜儀，以及光纖光柵風力葉片監測模型(光纖光柵現地監測Beam)之製作。傾斜儀原設計為純光纖力矩式，其構想源係修改自光纖光柵雙軸加速度計，雖然有較高之解析度，但有易於損壞之缺點。因此將設計改以光纖重錘彈片式與光纖力矩彈片式，雖然解析度相對較低，但具有不易損壞之優點，較適用於長期於惡劣現地環境之監測。將所有光纖光柵感測器製作完畢後進行實驗室內標定，標定完成後對於光纖光柵風力葉片監測模型進行穩定實驗，另外對於光纖光柵傾斜儀進行平台傾斜模擬實驗與標定平台傾斜量測。實驗結果證明各光纖光柵感測器皆符合預期成效，且成功製作八組光纖光柵傾斜儀及一組光纖光柵現地監測Beam進行相關監測與數據收集，並與光纖光柵解讀系統整合完成。未來將安裝於海氣象觀測塔上進行監測，並供後續光纖光柵技術研究與離岸工程應用之參考。

The optic fiber sensors have the advantages of being immune to moisture, lightning, electromagnetic interference (EMI), and allowing multiple sensors in a single line. So the optic fiber sensors are suitable for the structure health monitoring (SHM) of the Weather Observation Tower and the offshore monitoring technology. The goals of the research are to improve the FBG tiltmeter and build the FBG wind turbine structure health monitoring model (FBG in-situ monitoring Beam). The original design of the FBG tiltmeter is the Bi-FBGs row tiltmeter, which was originated from the Biaxial FBG Accelerometer. Although the Bi-FBGs row tiltmeter can provide high resolution, it is easy broken. In this study, the reed structure was used to improve the durability. The FBG column tiltmeter and the FBG row tiltmeter were using the reed with two FBGs on both side for measuring tilt. The reeds prevent the FBGs from easily breaking but on the other hand, the reeds also provide lower resolution compared with the original Bi-FBGs row tiltmeter. It also has more chance to conquer the harsh monitoring situations. After completing all the FBG sensors, such as FBG tiltmeters, FBG thermometers, FBG differential pressure gauge etc, and all the sensors were calibrated in the laboratory. Then the FBG wind turbine structure health monitoring model were subjected to the stability and durability tests. And do the platform tilt simulation tests and calibration platform tilt measuring by the FBG tiltmeters. The results of the tests show that the sensors are satisfied the design purpose. Eight FBG tiltmeters and one FBG in-situ monitoring Beam were built and passed the calibration tests, all the sensors were successfully integrated with the FBG data logger system in the laboratory. All the sensors and the FBG data logger system will also be installed on the Weather Observation Tower for structure health monitoring in the future. The FBG sensors monitoring system project can provide the experience of the optic fiber technology research development. And the project can also provide the offshore engineering parameters, behaviors, and applications to the future world.