吉林大学学报(工学版) ›› 2012, Vol. 42 ›› Issue (增刊1): 156-160.

• 论文 • 上一篇    下一篇

基于自发拉曼散射线成像的光学诊断系统开发

程鹏1, 李晓冰2, 王伟东3, 蒋俊光3, 池俊成4, 李国4, 郭英男1   

  1. 1. 吉林大学 汽车仿真与控制国家重点实验室,长春130022;
    2. 长春奥普光电技术股份有限公司,长春130031;
    3. 中国科学院 长春应用化学研究所,长春130011;
    4. 中国人民解放军装甲兵技术学院 车辆工程系,长春 130052
  • 收稿日期:2011-12-08 出版日期:2012-09-01 发布日期:2012-09-01
  • 作者简介:程鹏(1964-),男,博士研究生,研究员.研究方向:内燃机测试技术.E-mail:chengpeng@jlu.edu.cn
  • 基金资助:

    "973"国家重点基础研究发展规划项目(2007CB210004);吉林省科技发展计划项目(20090566).

Development of an optical diagnostic system based on line imaging of spontaneous Raman-scattering light

CHENG Peng1, LI Xiao-bing2, WANG Wei-dong3, JIANG Jun-guang3, CHI Jun-cheng4, LI Guo4, GUO Ying-nan1   

  1. 1. State Key Laboratory of Automobile Simulation and Control, Jilin University, Changchun 130022, China;
    2. Changchun UP Optotech Co. Ltd., Changchun 130031, China;
    3. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130011, China;
    4. College of Automotive Engineering , Academy of Armored Force Technology of PL A , Changchun 130052
  • Received:2011-12-08 Online:2012-09-01 Published:2012-09-01

摘要: 开发了一套基于激光自发拉曼散射线成像的光学诊断系统。设计了一种具有2级串联光学环腔的激光脉冲展宽外整形光路,将激光能量为400 mJ、峰值功率为0.4 GW和半高宽为6.5 ns的尖脉冲变为120 mJ、小于0.02 GW、大于35 ns的宽低脉冲,有效地避免了气体裂解、光学元件和石英窗口损坏及可燃气体点燃等现象的发生,提高了弱的拉曼散射信噪比。设计的扩束器和缩束器可以将8 mm直径的原始激光在10 m后的激发区内形成1 mm直径的平行激发光源。设计了一套组合消色差透镜组,可以最大限度地将66 mm长的散射光束缩小10倍变为6.6 mm高的实像,与ICCD的最大纵向高度匹配。使用ICCD内配的DDGTM实现了激光器与ICCD之间的时序同步。通过多通道气体拉曼光谱实验验证了该系统的实用性。该系统可应用在光学发动机中混合气浓度场和温度场的定量测定。

关键词: 光学诊断, 自发拉曼散射, 线成像, 激光脉冲整形, 气体

Abstract: An optical diagnostic system based on line imaging of spontaneous Raman-scattering(SRS) light has been developed. Designed a nanosecond-long laser pulse external face lifting optics by means of two series multiple optical ring-cavities converts a 400 mJ energy, 0.4 GW peak power, 6.5 ns-long input laser pulse into an approximately 120 mJ, 0.02 GW, 35 ns-long (FWHM) output laser pulse. In laser spontaneous Raman scattering excitation gas experiments, it could avoid effectively strong laser induced plasma spark and optical components/window damage in the focused beam path and laser igniting flammable gas, so that it improved substantially the signal to noise ratio of the weak signal levels generated by the Raman effect. Designed a beam expanding device and a beam shrinking device converts 8mm diameter original laser into 1mm diameter parallel laser. Designed composite achromatic lens converts 66 mm long scattering light into 6.6 mm high real image to match with the ICCD vertical height at maximum limit. Using the DDGTM in ICCD carries out the timing synchronization between laser and ICCD. The experiment of gas Raman spectrum with multiple channel tests and verifies the system practicability. Furthermore, the system can be applied to quantitative measurement of density and temperature of residual and fresh charge mixing in an optical engine using spontaneous Raman scattering method.

Key words: optical diagnostic, spontaneous Raman scattering, line imaging, laser pulse face lifting, gas

中图分类号: 

  • TK314
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