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分光型激光诱导磷光系统标定及气体温度场测量

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受光学系统和图像传感器的影响,分光型激光诱导磷光成像系统存在明显的空间响应不均匀性,导致磷光光谱强度比法无法获得准确的温度分布.针对此问题,基于最小二乘线性拟合原理,本文提出一种分光型激光诱导磷光成像系统响应空间不均匀的校正方法,获得了系统的校正矩阵.进一步开展了磷光光谱强度比标定实验,建立了磷光光谱强度比与温度的关系.在此基础上,在室温环境下(热电偶参考温度26.34℃)开展了冷态气体射流的二维温度场测量实验研究.结果表明:系统校正前,平均温度测量结果为46.58℃,标准方差为15.18℃,相对误差为76.84％;系统校正后,平均温度测量结果为26.06℃,标准方差为1.83℃,相对误差为1.07％.证明了基于最小二乘线性拟合的空间不均匀校正方法,可显著改善分光型激光诱导磷光成像系统的空间响应不均匀性,提高温度测量准确度.
Calibration of Laser Induced Phosphorescence System for Measurement of Gas Temperature Field
Due to the influence of optical system and image sensor,the optical laser-induced phos-phorescence imaging system has obvious non-uniformity of spatial response,which results in the inability to obtain accurate temperature distribution by the phosphorescence spectral intensity ra-tio method.To solve this problem,based on the principle of least square linear fitting,this paper proposes a correction method for the non-uniform response space of spectroscopic laser-induced phos-phor imaging system,and obtains the correction matrix of the system.Furthermore,the calibration experiment of phosphorescent spectral intensity ratio was carried out,and the relationship between phosphorescent spectral intensity ratio and temperature was established.On this basis,in the room temperature environment(reference temperature of thermocouple is 26.34℃),the two-dimensional temperature field measurement experiment of cold gas jet is carried out.The results show that the average temperature measurement result is 46.58℃,the standard variance is 15.18℃,and the relative error is 76.84％before system correction.After system correction,the mean temperature measurement result is 26.06℃,the standard variance is 1.83℃,and the relative error is 1.07％.It is proved that the spatial inhomogeneity correction method based on least square linear fitting can sig-nificantly improve the spatial response inhomogeneity of spectroscopic laser-induced phosphorescence imaging system and improve the accuracy of temperature measurement.

laser induced phosphorescenceresponse characteristicmulti-point correction methodintensity ratio methodtemperature field measurement

陈满福、张彪、李健、许传龙

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大型发电装备安全运行与智能测控国家工程研究中心,东南大学能源与环境学院,南京 210096

激光诱导磷光 响应特性 多点校正法 强度比法 温度场测量

国家自然科学基金国家自然科学基金江苏省自然科学基金东南大学"至善青年学者"资助项目

5197603852006036BK202012792242022R40037

2024

工程热物理学报
中国工程热物理学会 中国科学院工程热物理研究所

工程热物理学报

CSTPCD北大核心
影响因子：0.4
ISSN：0253-231X
年,卷(期)：2024.45(4)
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