用宽带纳米秒连贯抗斯托克斯-拉曼散射在感应合等离子火中的热量测量
Applied optics
|October 19, 2023
概括
多重纳秒连贯抗斯托克斯拉曼散射 (CARS) 成功测量了>6000 K的气体等离子体羽毛中的温度. 这种技术使得对高温环境的新见解成为超音速飞行研究的关键.
科学领域:
- 等离子体物理学的物理学
- 频谱学是一种光谱学.
- 航空航天工程 航空航天工程
背景情况:
- 描述高温环境对于开发高超音速飞行和重返地球技术至关重要.
- 感应合等离子火产生相关的测试环境,温度超过6000K.
- 气相相干抗冲击拉曼散射 (CARS) 是用于热化学状态分析的强大诊断工具.
研究的目的:
- 为了证明多重纳秒CARS在高温空气等离子体中的温度测量中的应用.
- 研究在极端温度 (>6000 K) 中使用CARS的可行性和挑战.
- 提供空间分辨率的温度数据,用于高能流量表征.
主要方法:
- 使用多重纳秒 (N2) CARS来探测大气中的空气等离子体羽毛.
- 采用理论光谱拟合来从测量的CARS光谱中确定N2温度.
- 集成了一个强化的CCD摄像头,用于敏感的单激光射击检测和背景抑制.
主要成果:
- 在超过6000 K的气体等离子体羽毛中实现了温度测量,这是气相CARS中最高的.
- 量化了N2 CARS从300K到6700K的信号强度扩展.
- 在3500-6200K时获得的单次激光射击温度精度为1.7%-2.6%.
- 呈现了轴向和辐射温度概况和时间序列数据.
结论:
- 多重纳秒CARS是一种可行的技术,用于在非常高温等离子体环境中进行温度测量.
- 该研究解决了实际实施的挑战,包括信号强度降低和背景亮度.
- 结果支持使用CARS来诊断与航空航天应用相关的高流中的空间解析接口过程.
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