【摘要】 结合受抑全内反射式光纤传感头精确的液位传感特性和单片机控制的步进电机驱动系统的高定位精度的特点,研制出一种智能型高精度光纤液位传感器。呈直角圆锥形的传感探头由62 5μm/125μm的单根多模光纤,经电弧加热拉制或机械研磨而成。由于从传感头反射回的光强依赖于传感头周围介质的折射率,当传感头移动通过2种折射率不同的介质的界面时,就会产生明显的光强度变化。利用单片机控制的步进电机伺服系统驱动传感探头,可以实时跟踪液面变化并同时给出液位信息。该传感器在2m测量范围内分辨率达到0 1mm,测量精度达到±0 4mm,无长期漂移。传感器能够对柴油、汽油及多种有机溶剂进行连续的液位监测。更多还原

【Abstract】 Combining the features of high sensitivity of the optical fiber frustrated-total-internal-reflection based sensor and high positioning accuracy of the single chip computer controlled stepping motor driving system,a novel fiber-optic level sensor system has been developed.The sensor head is made from standard multi-mode communication silica fiber with a taper tip.There is sensitive response of the reflected light signal from the fiber taper when the refraction index of its surrounding medium changes.As the fiber taper is attached to the single chip computer controlled stepping motor driving device,the liquid level can be tracked and displayed continuously.The system is able to measure the level of diesel oil,gasoline and other chemical liquid with a resolution of 0.1 mm and long term accuracy of ±0.4 mm in a full scale of 2 m.更多还原