Optimization of Tunable Diode Laser Arrays for Inlet Mass Capture Measurement

Samuel J. Grauer, Kristin M. Rice, Jeffrey M. Donbar, Nicholas J. Bisek, Jacob J. France, Bradley A. Ochs, Adam M. Steinberg

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Multibeam tunable diode laser absorption spectroscopy (TDLAS) sensors are used to measure mass flow in a complex, inhomogeneous flowfield with limited optical access. The cost and complexity of a TDLAS array increases with the number of beams, but adding beams does not necessarily improve accuracy. A technique to optimize the location and orientation of multiple laser beams for mass flow sensing in a 3D flow path geometry is developed and presented. We devised a statistical objective function that minimizes the uncertainty of estimates using a novel, linear formulation of absorption tomography with velocimetry (LATV). Beam arrangements that minimize the uncertainty of LATV reconstructions consequently maximize confidence in mass flow rate estimates; such arrangements are identified, subject to physical constraints on the pitch and catch optics. Our metric provides general guidance for the arrangement of a multibeam TDLAS mass flow sensor and does not require the use of tomographic reconstruction.

Original languageEnglish (US)
Pages (from-to)5854-5867
Number of pages14
JournalAIAA journal
Issue number10
StatePublished - 2022

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering


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