Linear absorption tomography with velocimetry (LATV) for multiparameter measurements in high-speed flows

SAMUEL J. GRAUER, ADAM M. STEINBERG

Research output: Contribution to journalArticlepeer-review

Abstract

We present a linear model for absorption tomography with velocimetry (LATV) to reconstruct 2D distributions of partial pressure, temperature, and streamwise velocity in a high-speed flow. Synthetic measurements are generated by multi-beam tunable diode laser absorption spectroscopy (TDLAS). The measurement plane is tilted relative to the streamwise direction and absorbance spectra are Doppler-shifted by the gas flow. Reconstruction comprises two stages. First, the thermodynamic state is obtained by reconstructing two or more integrated absorption coefficients and evaluating local Boltzmann plots. Second, the velocity field is directly reconstructed from absorbance-weighted linecenters. Absorbance data are inferred by Voigt fitting and reconstructions are quickly computed by matrix-vector multiplication. Nonlinear parameter combinations, such as the mass flow, are more accurate when computed by LATV than estimates obtained by assuming uniform gas properties along each beam.

Original languageEnglish (US)
Pages (from-to)32676-32692
Number of pages17
JournalOptics Express
Volume28
Issue number22
DOIs
StatePublished - Oct 26 2020

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

Fingerprint Dive into the research topics of 'Linear absorption tomography with velocimetry (LATV) for multiparameter measurements in high-speed flows'. Together they form a unique fingerprint.

Cite this