荧光寿命的快速傅里叶变换拟合方法  

Fitting Method of Fluorescence Lifetime Based on Fast Fourier Transform Arithmetic

作　　者：孙伟民[1] 张建中 于蕾 王晶菲[1] 相艳荣[1] 张扬[1] 苑立波[1] Grattan K TV Sun T 

机构地区：[1]哈尔滨工程大学理学院,哈尔滨150001 [2]哈尔滨工程大学信息和通信工程学院,哈尔滨150001 [3]School of Engineering, City University, London EC1V 0HB, UK

出　　处：《光学学报》2004年第6期838-841,共4页Acta Optica Sinica

基　　金：黑龙江省自然科学基金 (A0 30 8)资助课题

摘　　要：介绍了一种利用快速傅里叶变换算法对稀土掺杂物质的荧光寿命进行数据拟合的方法。稀土掺杂物质可用来制备多种光学传感器 ,用于温度、pH值等多种参量测量领域。本方法利用快速傅里叶变换 (FFT)结果作为基础 ,从非零项的相位角的正切值得出被测的荧光寿命 ,具有速度快、误差小、不受本底干扰等一系列优点。以掺铒光纤为例 ,通过数字仿真将本方法与其它几种传统的拟合方法进行了比较。快速傅里叶变换方法的测量偏差不到Prony方法的 5 0 % ,为对数似合 (log fit)方法测量偏差的 1/6。另外 ,快速傅里叶变换方法由于不受本底噪声影响 ,可以不必在信号处理时去掉本底噪声 ,因而可以明显缩短测量时间。A new method is proposed to fit the fluorescence lifetime of rare-earth element-doped materials, which can be used to build optical sensors of temperature or pH values. This method is based on the fast fourier transform (FFT). The fluorescence lifetime is obtained from the tangent function of the phase angle of the non-zeroth items of the FFT result. This method has a series of advantages such as quick calculation, high accuracy, and immunity to the base signal. This FFT method is compared with other traditional fitting methods by computer emulation for an erbium-doped fiber sensing system. The standard deviation of the FFT method is about 1/6 of that of the log-fit method and about a half of the standard deviation of the Prony method. In addition, the FFT method is immune to the background noise of the signal, so that the process of signal-processing by the FFT method can advanced.

关 键 词：荧光寿命 快速傅里叶变换 数据拟合 光谱分析 掺铒光纤 传感器 

分 类 号：O433.4[机械工程—光学工程]