基于偏最小二乘法的甲苯荧光光谱温度测量  

Toluene Fluorescence Spectroscopy Analysis in Different Temperatures Using Partial Least Squares

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作  者:韩明宏 于欣[1,2] 彭江波 杨超博[1,2] 曹振 亓金浩[1,2] 袁勋 HAN Ming-hong;YU Xin;PENG Jiang-bo;YANG Chao-bo;CAO Zhen;QI Jin-hao;YUAN Xun(Institute of Opt-electronics,Harbin Institute of Technology,Harbin 150001,China;National Key Laboratory of Laser Spatial Information,Harbin 150001,China)

机构地区:[1]哈尔滨工业大学光电子技术研究所,黑龙江哈尔滨150001 [2]激光空间信息全国重点实验室,黑龙江哈尔滨150001

出  处:《光谱学与光谱分析》2025年第4期947-952,共6页Spectroscopy and Spectral Analysis

基  金:国家自然科学基金项目(62175053);气动院高超声速气动力/热技术重点实验室创新项目(XFX20220103)资助。

摘  要:温度作为流场的重要参数之一,实现流场温度的测量具有重要意义。甲苯作为激光诱导荧光中常用的示踪剂,由于其荧光强度对温度敏感,常用于流场温度测量。甲苯可以用于温度测量的主要原因是其荧光光谱随温度升高产生红移,而目前缺乏直接阐明甲苯光谱与温度相关性的分析,通过对不同温度甲苯荧光光谱,使用偏最小二乘法分析建立温度和光谱之间的关联。光谱测量波长范围有效覆盖了甲苯整个荧光区间。使用266 nm激光作为甲苯的激发波长,测量35个不同温度下甲苯的荧光光谱,光谱测量累积100次以消除随机噪声。将35个温度点对应260~330 nm波长范围的光谱以6∶1比例分配到数据集和验证集中。使用数据集建立偏最小二乘模型时,模型的因子数设定为9,得到模型的决定系数为0.9922,数据的验证均方根误差为4.59 K,将验证集的数据应用于此模型中,得到预测结果的相对误差均小于1%,验证集的均方根误差为1.67 K。与实际的温度值具有较好的一致性,实验结果证明了利用偏最小二乘法通过甲苯荧光光谱进行温度测量的可行性。该模型的建立为流场温度测量的研究提供了新的思路和方法。使用模型得到的温度结果,可在不便原位标定的流场中作为温度测量的标定数据。Temperature measurement,as one of the important parameters in flow fields,is of great significance.Toluene,a commonly used tracer in laser-induced fluorescence,is often used for flow field temperature measurement due to its temperature-sensitive fluorescence intensity.The primary reason for using toluene in temperature measurement is the redshift in its fluorescence spectrum with increasing temperature.However,there is a lack of direct analysis to elucidate the correlation between the toluene spectrum and temperature.This paper analyzes the fluorescence spectra of toluene at different temperatures using partial least squares analysis to establish the correlation between temperature and spectrum.The spectral measurement wavelength range effectively covers the entire fluorescence range of toluene.Using a 266 nm laser as the excitation wavelength for toluene,the fluorescence spectra of toluene at 35 different temperatures are measured,and the spectral measurements are accumulated 100 times to eliminate random noise.The spectra of the 35 temperature points corresponding to the 260~330 nm wavelength range are allocated to the dataset and validation set in a 6∶1 ratio.When establishing the model using the dataset,the number of factors in the model is set to 9,and the coefficient of determination of the obtained model is 0.9922.The root mean square error of the data validation is 4.59 K.When the validation set data is applied to the model,the relative error of the predicted results is within 1%,and the root mean square error of the validation set is 1.67 K,which is in good agreement with the actual temperature values.The experimental results demonstrate the feasibility of using the partial least squares method to measure temperature through the toluene fluorescence spectrum.The establishment of this model provides new ideas and methods for the study of flow field temperature measurement.Meanwhile,the temperature results obtained from the model can also be used as calibration data for temperature measurement in flow fi

关 键 词:激光诱导荧光光谱 温度测量 偏最小二乘 甲苯 

分 类 号:O433.4[机械工程—光学工程]

 

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