Design and Realization of a New Thin-wall Optical-fiber Bubble Pressure Sensor
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摘要: 围绕海洋油气开发需要，提出了一种薄壁光纤气泡压力传感器及其制作方法。利用电弧放电法将单模光纤与空芯石英管相熔，并将乙醇锁在光纤气泡内，再利用不同强度的电弧放电使光纤气泡持续膨胀，制作出壁厚只有几百纳米的光纤气泡。与传统的光纤气泡相比，该光纤气泡具有更好的压力和温度传感特性。实验结果表明，所制备的薄壁光纤气泡具有较高的压力灵敏度，经测试得到的压力灵敏度为1 313 pm/MPa，同时温度交叉灵敏度为8.644 kPa/℃。Abstract: For off-shore oil and gas exploitation requirements, a thin-walled optical-fiber air-bubble pressure sensor and its fabricating method is proposed. Ethanol is locked in the optical-fiber air-bubble by splicing a single mode fiber to a silica tube with electric arc discharge method. The optical fiber air bubble is expanded by using various intensity electrical arc discharges. The thin-walled optical fiber air bubble with a thickness of several hundred nanometers can be achieved, which shows greatly improved pressure and temperature sensing characteristics compared with some conventional fiber bubbles. Experimental results indicate that the proposed new sensors based on thin-walled optical-fiber air-bubble shows a high pressure sensitivity of 1 313 pm/MPa, meanwhile the temperature cross-sensitivity is 8.644 kPa/℃.
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