设计了一种新的进样装置,利用傅里叶变换红外光谱仪来获得油液光谱数据.采用在不含水的液压油中混入不同量水的方式制备待测油液样品,采集不同含水量油液在3 780～3 500 cm-1波段的光谱并进行积分,得到该波段的吸收能量数据.分析实验数据发现,红外光谱的吸收能量与油液水含量之间满足二次曲线函数关系,拟合得到的二次曲线与实验数据之间的相对误差在0.01％量级.该方法可以作为一种用于定量测量船用机械油液含水量的有效方法,并指导开展相关基于中红外发光二极管和光电二极管能量吸收的传感器的研制.%A method that could be used to quantify the concentration of water in oil for marine-borne machine is discussed in the present paper. Water molecule has distinct absorption bands in mid-infrared section in 3 773~3 509 cm-1, so it could be applied to the quantification of water in oil. An experimental sample cell was designed to accomplish the experiment for the convenience rnof sample preparation and mount in measurement, and it was designed to suit for FTIR spectrometer. The authors chose to prepare the sample oil by blending different amount of water into oil through titratioa The spectra of oil with different water concentration were acquired and their integrals were calculated. The analysis of experimental result shows that the functional relationship between the integral of spectrum in 3 773~3 509 cm-1 and the percentage of water content in oil is a quadratic curve. The relative error between the fitted curve and experimental data is at the level of 0. 01%. The research work in this paper presents the possibility of quantification of water content in oil through mid-infrared and gives us an idea to design a kind of new sensor based on mid-infrared LED and PIN for measure and to warn people who monitor the abnormal variation of water content in different kind of oil used in marine-borne mechanical system.
展开▼
