强度调制型光纤液体浓度检测传感器研究

Development of Intensity Modulated Optical Fibre Sensor for Determination of Solution Concentration

根据全反射原理．菲涅尔公式及朗伯-比尔定律，证明了低浓度溶液与折射率和吸光度之间的线性关系，得到了光纤出射光强随液体包层浓度成负指数关系。根据上述结果，利用光的强度调制进行溶液浓度检测，即通过测量光强的变化，检测出待测溶液浓度。实验表明，强度调制光纤传感器可以实现溶液浓度检测。

Based on the principle of total reflection, Fresnel formula and Lambert-Beer＇s law, linear relationships between the concentration of a solution and the light refractive index as well as the light absorbance were analyzed respectively, and a negative exponent relationship between the optical leakage strength and the solution concentration was obtained. The above findings revealed that the light intensity modulation could be used to detect the concentration of a solution, i.e., determination of the solution concentration could be done by means of an intensity modulated optical sensor.