自发喇曼成像法在线测量流场组分浓度
Direct measurement of the constituents flow field by the spontaneous Raman imaging technique(I)
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摘要: 介绍了自发喇曼成像技术实时监测流场组分浓度的方法，利用Nd：YAG脉冲激光器以及ICCD和光谱仪对大气进行了不同实验条件的测试，得到了影响谱线强度及测试精度的几个因素；得到了大气流场各主要成分的自发喇曼散射光谱和绝对浓度，测量误差小于8%。该技术可望在氧碘化学激光器单重态氧发生器物种浓度测定时得以应用以改善O2(1Δ)浓度测试精度较低的现状。Abstract: A spontaneous Raman imaging system has been described that can monitor the concentrations of major species in flow field in real time. We present the results of the species in the air with a doubled Nd:YAG laser and a single intensified CCD array at the exit of an imaging spectrograph. The output laser energy and the position of the measurement point have effect on the precision. The error is calculated to be less than 8%. The measurement precision of O2（a1Δ） concentration will be improved largely when this technique is applied to monitor chemical oxygen-iodine laser singlet oxygen generator performance.
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Key words:
- spontaneous raman scattering /
- measurement in real time /
- flow field
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