Development of An Optic Fiber Bragg Grating Pressure Sensor
|關鍵字:||光纖光柵;光纖光柵壓力感測器;optic fiber Bragg grating;fiber Bragg grating pressure sensor|
The objective of this research is to develop an optic fiber Bragg grating (FBG) pressure sensor that can be applied in the field for ground water monitoring. The sensor should have the resolution and stability required for the field applications. Water pressure/level can be an important part of the field monitoring system for purposes such as ground subsidence and slope stability. The use of conventional electronic pressure sensors can have drawbacks that relate to electronic devices. If properly designed, FBG sensors have the advantages of small size, light weight and immune to electromagnetic interference. This research develops two types of FBG pressure sensors. The first type modulates the pressure by chirping of FBG (the chirp sensor). The other design is based on uniform stretching of FBG (the stretch sensor). The chirp sensor has the potential of multi-purpose as it can be used a load cell or displacement sensor. The stretch sensor is compact. The thesis describes the design principles of the two FBG pressure sensors, predict the performance of the sensors based on linear elastic analysis of the sensor components. The developed sensors were tested in the laboratory, and the results were compared with the linear elastic analysis.
|Appears in Collections:||Thesis|