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One-dimensional air temperature measurements by air resonance enhanced multiphoton Ionization thermometry (ART)

McCord, Walker ; Clark, Aleksander ; Zhang, Zhili

Optics express, 2022-01, Vol.30 (11) [Periódico revisado por pares]

United States: Optical Society of America (OSA)

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  • Título:
    One-dimensional air temperature measurements by air resonance enhanced multiphoton Ionization thermometry (ART)
  • Autor: McCord, Walker ; Clark, Aleksander ; Zhang, Zhili
  • Assuntos: Optics
  • É parte de: Optics express, 2022-01, Vol.30 (11)
  • Notas: USDOE Office of Science (SC)
    SC0021382
  • Descrição: In this work, a detailed calibration study is performed to establish non-intrusive one-dimensional (1D) rovibrational temperature measurements in unseeded air, based on air resonance enhanced multiphoton ionization thermometry (ART). ART is generated by REMPI (resonance enhanced multi-photon ionization) of molecular oxygen and subsequent avalanche ionization of molecular nitrogen in a single laser pulse. ART signal, the fluorescence from the first negative band of molecular nitrogen, is directly proportional to the 2-photon transition of molecular oxygen C3Π (v = 2) ← X3Σ (v’=0), which is used to determine temperature. Experimentally, hyperfine structures of the O2rotational branches with high temperature sensitivity are selectively excited through a frequency-doubled dye laser. Electron-avalanche ionization of N2results in the fluorescence emissions from the first negative bands of N2+near 390, 425, and 430nm, which are captured as a 1D line by a gated intensified camera. Post processing of the N2+fluorescence yields a 1D thermometry line that is representative of the air temperature. It is demonstrated that the technique provides ART fluorescence of ~5cm in length in the unseeded air, presenting an attractive thermometry solution for high-speed wind tunnels and other ground test facilities.
  • Editor: United States: Optical Society of America (OSA)
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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