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<p>We report a sensitive laser absorption diagnostic method for shock tube experiments using a multipass configuration with a single-line spot pattern. The multipass setup consists of two silver-coated concave mirrors, which are placed outside the optical windows of the shock tube. The multipass configuration increases the effective path length by a factor of 31. All the reflected beams are aligned within a single plane that is perpendicular to the propagation direction of the shock wave, mitigating the Schlieren and beam steering effects. We validated the approach by measuring shock-heated gases behind reflected shock waves using tunable laser absorption spectroscopy of water vapor at 7447.48&#xa0;cm<sup>− 1</sup>. Our approach enables sensitive species detection for high-temperature shock tube/laser absorption experiments.</p>

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Sensitive shock tube measurements using multipass laser absorption spectroscopy

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月1日

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  • Haojia Sun,
  • Mohsin Raza,
  • Sihao Wang,
  • Dapeng Liu,
  • Daxin Wen,
  • Hongbo Ning,
  • Wei Ren

摘要

We report a sensitive laser absorption diagnostic method for shock tube experiments using a multipass configuration with a single-line spot pattern. The multipass setup consists of two silver-coated concave mirrors, which are placed outside the optical windows of the shock tube. The multipass configuration increases the effective path length by a factor of 31. All the reflected beams are aligned within a single plane that is perpendicular to the propagation direction of the shock wave, mitigating the Schlieren and beam steering effects. We validated the approach by measuring shock-heated gases behind reflected shock waves using tunable laser absorption spectroscopy of water vapor at 7447.48 cm− 1. Our approach enables sensitive species detection for high-temperature shock tube/laser absorption experiments.