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<p>Flow field visualization techniques, e.g., schlieren and shadowgraphy, are indispensable in fluid mechanics research and application. In this paper, we present a novel technique, named holographic focusing schlieren imaging (HFSI), which takes only a single-camera and single-shot configuration to achieve three-dimensional (3D) flow visualization. The essence of this technique is that a coherent reference wave is introduced to interfere with the wavefront yielded by the traditional focusing schlieren (FS) method, forming a hologram. The reconstruction of the hologram directly yields the FS results along the test volume slice by slice with adjustable intervals, achieving 3D visualization. To demonstrate the capability of HFSI, a proof-of-concept setup was established, and experiments were performed using a compressed air jet, with a comparison to the FS method. The result shows that HFSI image reconstruction remarkably refocuses the out-of-focus jet flow, yielding similar schlieren effect observed in the FS images. The proposed HFSI holds significant practical value in some scenarios, such as in a wind tunnel, as it requires only one pair of parallel windows to achieve 3D flow visualization.</p>

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Holographic focusing schlieren imaging (HFSI) for three-dimensional flow visualization

  • 期刊论文

  • 发表日期：

    2025年1月5日

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  • Zhiming Lin,
  • Yiqin Li,
  • Aimin Xie,
  • Kaihui Liu,
  • Zhiliang Xue,
  • Qiwen Jin,
  • Yingchun Wu,
  • Xuecheng Wu

摘要

Flow field visualization techniques, e.g., schlieren and shadowgraphy, are indispensable in fluid mechanics research and application. In this paper, we present a novel technique, named holographic focusing schlieren imaging (HFSI), which takes only a single-camera and single-shot configuration to achieve three-dimensional (3D) flow visualization. The essence of this technique is that a coherent reference wave is introduced to interfere with the wavefront yielded by the traditional focusing schlieren (FS) method, forming a hologram. The reconstruction of the hologram directly yields the FS results along the test volume slice by slice with adjustable intervals, achieving 3D visualization. To demonstrate the capability of HFSI, a proof-of-concept setup was established, and experiments were performed using a compressed air jet, with a comparison to the FS method. The result shows that HFSI image reconstruction remarkably refocuses the out-of-focus jet flow, yielding similar schlieren effect observed in the FS images. The proposed HFSI holds significant practical value in some scenarios, such as in a wind tunnel, as it requires only one pair of parallel windows to achieve 3D flow visualization.