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频率扫描爆发模式过的雷利散射用于kHz速率,多参数,气相测量
Optics letters
|January 31, 2025
概括
这项研究增强了频率扫描过的雷利散射 (FS-FRS),以更快地测量气流. 这种新方法可以同时获得1kHz的温度,压力和速度数据的测量速率.
科学领域:
- 流体动力学和空气动力学
- 基于激光的测量技术
- 频谱学是一种光谱学.
背景情况:
- 分子雷利散射 (RS) 提供了对气体流特性 (如压力,温度和速度) 的洞察.
- 过雷利散射 (FRS) 通过消除散光来提高信号质量,但传统方法难以同时测量多个参数.
- 频率扫描 (FS) FRS允许多参数定量化,但由于数据速率低而受到限制.
研究的目的:
- 为了显著提高频率扫描过雷利散射 (FS-FRS) 的数据采集率.
- 为了使多个流量参数的同时,空间分辨率测量.
- 为了证明增强的FS-FRS技术在高速流动诊断中的适用性.
主要方法:
- 使用可调节波长的快速爆发模式激光在20kHz运行,以提高FS-FRS数据速率105.5.
- 使用窄带分子波器来隔离和分析雷利散射光.
- 将FS-FRS应用于未扩展的喷气,同时测量温度,压力和辐射速度.
主要成果:
- 实现了1毫秒的时间平均数据的1kHz测量速率.
- 成功演示了温度,压力和辐射速度的同时,空间分辨率的测量.
- 验证了该技术在高速流量表征方面的潜力.
结论:
- 快速波长调节的爆发模式激光显著提高FS-FRS数据速率.
- 这一进步使kHz速率,多参数流量测量成为可能,这对于动态流量研究至关重要.
- 该技术是高速流量测试设施中先进诊断的有希望的工具.
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