| Summary: | 碩士 === 國立屏東科技大學 === 車輛工程系所 === 100 === In this thesis, a magnetic sensor and an acetone sensor are proposed based on the polymer optical fiber. Both experimental tests and the finite element models are used to explore the effects of different design parameters on the sensitivity of the sensors. The finite element models are used to provide more information for the explanation of the experimental results. The parameter discussed for the magnetic sensor is the space between two fiber ends. The parameters discussed for the acetone sensor are the space between two fiber centers and the concentration of acetone. The results indicate that a smaller fiber space results in a higher sensitivity of the magnetic sensor. The sensitivity is 5.37×10-3 V/G as the fiber space is 10 mm. In addition, the sensitivity of the acetone sensor increases as the space between two fiber centers decreases. However, this will speed up the corrosion and fracture of the acetone sensor. The sensitivity of the acetone sensor is 0.63 μw/sec as the space between two fiber centers is 5 mm.
Meanwhile, an electromagnetic finite element model is used to explore the effects of sensor location and the magnetic permeability of the sensor on the magnetic field distribution. The results show that higher magnetic field is obtained as the magnetic permeability increases or the sensor is located near the magnetic field generator. For a sensor with a magnetic permeability of 19854 × 10-6 H/m, the magnetic field is increased by 1.14 when the distance between the sensor and the magnetic field generator decreases from 6 mm to 1 mm.
Keywords : POF, magnetic field sensor, acetone sensor, sensitivity
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