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利用菲涅尔反射定律提出了一种测量液体浓度的新方法。整个实验装置结构简单,主要由一个激光光源、三个光耦合器、两个光电探测器组成。光源所发出的光经过三个光耦合器后传输至光纤-液体表面发生反射,反射回的光由两个光电探测器接收。在测量过程中引入参考光路,利用相对技术,使得被测液体的浓度值仅由相对接收光强R决定,从而很好地解决了光源稳定性、环境干扰等测量难题。实验以食盐溶液和蔗糖溶液为测量对象,实验结果与理论分析十分吻合。整个实验装置结构简单,测量精度高,易于操作,测量稳定性能够达到99%以上。
Using Fresnel reflection law a new method of measuring liquid concentration is proposed. The whole experiment device has a simple structure and mainly consists of a laser light source, three optical couplers and two photoelectric detectors. The light emitted by the light source is transmitted to the optical fiber through three optical couplers - the liquid surface is reflected, and the reflected light is received by the two photodetectors. The introduction of reference light path in the measurement process, the use of relative technology, making the measured concentration of liquid only by the relative received light intensity R decision, so as to solve the light source stability, environmental interference and other measurement problems. Experiments with salt solution and sucrose solution as the measurement object, the experimental results are in good agreement with the theoretical analysis. The whole experimental device has the advantages of simple structure, high measuring accuracy and easy operation, and the measurement stability can reach more than 99%.