Detection of rhodamine B concentration in distilled water can be conducted without direct contact between the sensor probe and the sample using fiber bundle as a sensor probe and concave mirror as a sample container. The fiber bundle used is a concentric and a pair bundle probe. The working mechanism of the sensor is based on the displacement sensor and absorption of rhodamine B on laser light at a wavelength of 543 nm. The concentration of rhodamine B was detected through the valley and the peak voltage resulting from the displacement of the sensor probe to the sample surface. The best performance is shown by a sensor that uses a concentric bundle as a probe with a detection range of 0–20 ppm with a resolution of 0.6 ppm.

中文翻译：

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非接触式纤维束检测蒸馏水中若丹明B浓度的机制

使用纤维束作为传感器探头，使用凹面镜作为样品容器，可以检测出蒸馏水中的若丹明B浓度，而无需在传感器探头和样品之间直接接触。使用的光纤束是同心和成对的束探头。传感器的工作机制基于位移传感器和若丹明B在543 nm波长的激光上的吸收。罗丹明B的浓度通过波谷和传感器传感器向样品表面位移产生的峰值电压进行检测。传感器使用同心束作为探头，检测范围为0–20 ppm，分辨率为0.6 ppm，显示出最佳性能。