基于快速傅里叶变换的荧光测温仪  

Instrument of Fluorescence Thermal Measurement Based on Fast Fourier Transform

作　　者：王玉田[1] 王冬生[1] 崔立超[1] 

机构地区：[1]燕山大学电气工程学院,河北秦皇岛066004

出　　处：《测控技术》2006年第11期18-20,共3页Measurement & Control Technology

基　　金：河北省教育厅自然科学研究计划资助项目(2001265)

摘　　要：采用激光加热小基座法生长出端部掺Cr3+的蓝宝石光纤荧光温度传感头,具有结构紧凑,耐高温等特点,测温范围从室温到450℃。基于快速傅里叶变换的拟合方法,从第一个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、不受本底干扰等优点。与其他几种传统的拟合方法进行比较,快速傅里叶变换方法的测量偏差不到Prony方法的一半,与Marquardt方法测量的偏差接近。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,可以缩短测量时间,提高测量的分辨率。A sapphire fiber thermal probe with Cr3~ ion-doped end is grown from the laser heated pedestal growth method. The fluorescence thermal probe offers advantages of compact construct, high performance and ability to withstand high temperature among the detection range from the room temperature to 450 ℃. Basing on the fast Fourier transform （ FFT）. The fluorescence lifetime is obtained from the tangent function of the phase angle of the first non-zeroth items of the FFT result. This method has advantages such as quick calculation, high accuracy and immunity to the base signal. Comparing with other traditional fitting methods, the standard deviation of the FFT method is about half of the standard deviation of the Prony method and near that of the Marquardt method. In addition, the FFT method is immunity to the background noise of the signal, so that the process of signal processing by the FFT method can be advanced.

关 键 词：荧光温度计 傅里叶变换 蓝宝石光纤 

分 类 号：TP212.14[自动化与计算机技术—检测技术与自动化装置]