The Velocimeter Based on Fiber Bragg Gratings
碩士 === 逢甲大學 === 電機工程所 === 100 === The velocimeter based on fiber gratings is proposed in this study and its main sensing elements are two fiber Bragg gratings with same central wavelength and a little bit different reflectivities. By using a special packaged-structure in which the two fiber Bragg gr...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2012
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| Online Access: | http://ndltd.ncl.edu.tw/handle/10929846375374702182 |
| Summary: | 碩士 === 逢甲大學 === 電機工程所 === 100 === The velocimeter based on fiber gratings is proposed in this study and its main sensing elements are two fiber Bragg gratings with same central wavelength and a little bit different reflectivities. By using a special packaged-structure in which the two fiber Bragg gratings are packaged in a metal cylinder for sensing a differential pressure. The velocimeter is composed of this differential pressure sensor, an Venturi meter or an orifice meter.
The mechanism of the velocimeter is that the differential pressure resulted from a fluid flowing through Venturi meter or orifice meter causes the variation of the central wavelength of fiber Bragg gratings. The flow and flowing velocity of the fluid in the tube can be calculated by the differential pressure obtained from two ports of an Venturi meter or an orifice meter. The measuring sensitivity is proportional to the dimension of the sensor. Thus the variation of the central wavelength of fiber Bragg gratings can be used for monitoring the flowing velocity of fluid in real time. In the future, we expect that the velocimeter can be applied in monitoring oil pipeline and water pipeline practically.
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