| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程系 === 107 === This thesis presents a remote fiber monitoring system, which combines a fiber Bragg grating (FBG) interrogation system with remote monitoring software. This system is cheaper than other optical sensor systems in the market, so it can replace high-cost optical measuring instruments. We develop it to ensure livelihood security and instantaneously monitor several bridges in large scale.
The working mode of the third fiber Bragg grating interrogation system is different from the first and second one. You can set the starting wavelength and the ending wavelength. In the band you set, you can test any quantity of fiber Bragg grating. The volume is bigger than the second one, because we put L band or O band ASE light source and other component in the fiber Bragg grating interrogation system. The wavelength measurement ranges from 1528 nm to 1563 nm (includes the entire C band) and the speed of scanning reaches 40 second/ entire C band. The remote monitoring software includes initial values setting, manual scanning, automatically bridges monitoring and data saving. The users can use these functions to control fiber Bragg grating interrogation system and analyze the data by using the monitoring software at other places.
The last chapter is divided into two parts. First, it’s about FBG settlement sensor. We use clay to replace the float in the FBG settlement sensor and, we use the same weight but different bottom areas of clay to reach different sensitivity, such as. The suspension of 40g、60g、80g clay, and the length of 10cm、5cm、2.5cm, respectively.
As a result, the sensitivity can reach 0.236nm/cm. The experiment verifies that we can control different bottom areas to reach different sensitivity. The other part is about the accelerometer. In this part, we know that using larger force compression on the springs at the right side, the wavelength shift is longer. On the other hand, we also get the same result at the left side. However, the length of wavelength shift at left side is shorter than that at right side.
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