Laser absorption spectroscopy for traceable dynamic pressure measurement in shock tubes: an inter-laboratory comparison

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Abstract
In this study, the shock tubes at RISE and PTB were validated at low pressure region (up to 200 kPa) and frequency up to 100 kHz by an inter-laboratory comparison using two transfer standards (TSs). Shock tubes can generate step-like pressure pulses at the end-wall plate of the driven section where the device under test is mounted. The generated reference step pressure is assumed to have the shape of a Heaviside step function. Therefore, the pressure amplitude can be calculated using the Rankine–Hugoniot step relations with the knowledge of the Mach number of the incoming shock wave and the initial static pressure of the gas medium. In this case, the shock tube is considered as a primary standard. On the other hand, shock tube can be used as a generator of repeatable reference pressure steps while its amplitude is measured using other primary methods, such as laser absorption spectroscopy. In this work, the respective shock tubes at RISE and PTB were used as both primary standards and pressure generators where laser absorption spectroscopy method was deployed to measure the reference pressure amplitudes. Two TSs were characterized at RISE and PTB facilities, and their dynamic responses were calculated at different pressure amplitudes and the associated uncertainty budgets were evaluated. The comparison between the shock tube results obtained at RISE and PTB showed good consistency.
Funding Information
  • the Basic Research Program of Jiangsu (BK20251357)
  • The Swedish Governmental Agency for Innovation Systems, VINNOVA (2022-02963)
  • the European Partnership on Metrology, co-financed from the European Union’s Horizon Europe Research and Innovation Programme and by the Participating States (23IND09 MaritimeMET)
  • Start-up Research Fund of Southeast University (RF1028625081)

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