在电位滴定法测定喷气燃料总酸值中采用小波变换法检测电位滴定终点。以二次样条小波为基函数对电位滴定曲线进行离散二进小波分解,在适当尺度上基本滤除曲线的干扰噪声,通过分析细节信号得到滴定曲线的突跃点,从而判定滴定终点。与指示剂法相比,本方法的测定结果具有相当的准确度和更高的精密度。本方法可快速测定喷气燃料的总酸值。

Wavelet transform method was applied to detect the endpoint for determination of total acid number in jet fuel by potentiometric titration. The discrete binary wavelet decomposition of titration curve was carried out with quadratic spline wavelet as basic function. Much of interfering noise in curve was filtered at appropriate scale, the jump points were obtained by analyzing the detail signals and the titration endpoint was determined. Compared with the indicator method, the results of this method showed considerable accuracy and higher precision. This method was used for rapid determination of the total acid number of jet fuel.