【摘要】 利用级联长周期光纤光栅进行透明液体浓度测量。将光栅充分浸没在液体槽中，通过向液体槽内注入不同浓度的溶液研究液体浓度对级联光纤光栅谐振波的影响。结果表明谐振波偏移量与溶液浓度之间存在线性关系。因此，通过谐振波偏移量，能够计算液体未知浓度。从而实现了液体浓度的测量。该实验操作简单，测量方便，适合在近代物理实验教学中推广应用。更多还原

【Abstract】 The transparent liquid concentration is measured using the cascade long period fiber grating.The grating is fully immersed in the liquid tank, and the effect of the liquid concentration on the resonance waves of the cascade fiber grating is investigated by injecting solutions of different concentrations into the liquid tank.We show a linear relationship between the resonant wave offset and the solution concentration.Therefore, the liquid unknown concentration can be calculated by the resonant wave offset.Thus, the liquid concentration is measured.The experiment is easy to operate and convenient to measure, which is suitable for popularization and application in modern university physics experiment teaching.更多还原