在單光纖對光耦合模型的基礎上, 研究了三種帶補償功能的三光纖反射式位移傳感器, 建立了通用的光耦合的數學模型。仿真研究了它們的位移特性, 并比較了它們的優缺點。研究結果表明, 采用三光纖的光纖位移傳感器不但線性范圍、位移靈敏度和線性度等特性得到較好改善, 而且可以有效地消除光源功率波動和反射面的反射率變化等因素對位移測量的影響。
關鍵詞: 光纖傳感器; 數學模型; 位移特性; 強度補償; 反射率補償
中Abstract : In the field of reflective fiber2optic displacement sensor , in order to improve the displacement measuring accuracy , two receiving fibers are often used for intensity and reflectivity compensation. Based on the mathematic model of light coupling between the
fiber pair , three types of tri2fiber optic sensors are studied. The general mathematic model of the tri - fiber sensors is proposed. Simula2 tion about them is finished. Research shows that these kinds of tri2fiber sensors can not only improve the linear range , linearity and dis2
placement measuring sensitivity , but also eliminate the influence caused by power fluctuation of the light source and variety of surface re2 flectivity.
Key words : fiber optic sensor ; mathematic model ; displacement ; property ; intensity compensation ; reflectivity compensation