基于偏振探测的CARS非共振背景抑制与分离

发布时间：2018-06-20 18:47

本文选题：光谱诊断 + 温度测量　；参考：《光子学报》2017年S1期

【摘要】：为消除非共振背景干扰,提高相干反斯托克斯拉曼散射测量精度,研究了基于偏振探测的相干反斯托克斯拉曼散射非共振背景抑制与分离.首先,从理论上证明了相干反斯托克斯拉曼散射信号强度只取决于三阶非线性极化率共振部分,而与非共振部分无关,并且三阶极化率共振部分与非共振部分偏振方向不一致,为偏振相干反斯托克斯拉曼散射提供了理论支撑;然后,以平面火焰炉温度场为研究对象,设计了偏振相干反斯托克斯拉曼散射探测系统实施方案,并与热电偶、常规相干反斯托克斯拉曼散射两种方法在相同条件下开展了温度测量对比实验.实验结果表明:常规相干反斯托克斯拉曼散射方法的测量相对误差优于7%,测量相对不确定度优于7%;偏振相干反斯托克斯拉曼散射方法的测量相对误差优于4%,测量相对不确定度优于5%;相同工况条件下与常规相干反斯托克斯拉曼散射相比,偏振相干反斯托克斯拉曼散射最接近均值的拟合光谱更加平滑.偏振相干反斯托克斯拉曼散射具有更小的拟合误差,是一种更为有效的相干反斯托克斯拉曼散射诊断方法.
[Abstract]:In order to eliminate non-resonant background interference and improve the measurement accuracy of coherent anti-Stokes Raman scattering, the non-resonance background suppression and separation of coherent anti-Stokes Raman scattering based on polarization detection are studied. Firstly, it is proved theoretically that the intensity of coherent anti-Stokes Raman scattering signal depends only on the third order nonlinear polarizability resonance, but is independent of the non-resonance part, and the third order polarizability resonance part is not consistent with the non-resonant part polarization direction. It provides a theoretical support for polarization coherent anti-Stokes Raman scattering. Then, taking the temperature field of plane flame furnace as the research object, the scheme of polarization coherent anti-Stokes Raman scattering detection system is designed and compared with the thermocouple. The conventional coherent anti-Stokes Raman scattering method is used to compare the temperature measurements under the same conditions. The experimental results show that the relative error of the conventional coherent anti-Stokes Raman scattering method is better than that of the conventional anti-Stokes Raman scattering method, and the relative error of the conventional anti-Stokes Raman scattering method is better than that of the conventional anti-Stokes Raman scattering method. The relative uncertainty is better than 5. Compared with the conventional coherent anti-Stokes Raman scattering under the same operating conditions, The fitting spectra of polarization coherent anti-Stokes Raman scattering are smoother. Polarization coherent anti-Stokes Raman scattering has smaller fitting error and is a more effective diagnostic method for coherent anti-Stokes Raman scattering.
【作者单位】：中国空气动力研究与发展中心超高速空气动力研究所高超声速冲压发动机技术重点实验室;中国空气动力研究与发展中心设备设计及测试技术研究所;
【基金】：国家自然科学基金(Nos.11272337,11272338) 高超声速冲压发动机技术重点实验室开放基金(No.STS/MY-KFKT-2015001)资助~~
【分类号】：O657.37

【相似文献】