{
  "abstract": "A dual-band mid-infrared absorption imaging method is demonstrated for spatially resolved measurement of ethylene concentration and temperature in a Mach-2 cavity flow. The method used narrowband filters selected to exploit the differing in-band temperature sensitivities of ethylene absorption, together with a broadband infrared source and high-frame-rate mid-wave infrared camera. Temperature-dependent, filter-weighted absorption cross-sections were used to measure two-dimensional ethylene number density and temperature fields. Measurements were obtained for cavity, curtain, and discrete fuel-injection configurations, including cases with the leading edge of a quasi-steady shock near the cavity. Cavity equivalence ratio measurements agreed well with independent extractive measurements and reproduced trends previously observed using hyperspectral imaging. A complementary single-band implementation using a temperature-independent filter provided instantaneous ethylene concentration fields at 100 Hz and revealed intermittent reductions in cavity equivalence ratio associated with plume deflection by the shock train leading edge. The dual-band approach provides quantitative full-field measurements with substantially simpler spectral instrumentation than hyperspectral imaging while retaining flexibility for time-resolved flow measurements.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.03341",
  "author_total": 5,
  "authors": [
    {
      "name": "Loren C. Hahn"
    },
    {
      "name": "Erik L. Braun"
    },
    {
      "name": "Brendan J. McGann"
    },
    {
      "name": "Katherine C. Opacich"
    },
    {
      "name": "Timothy M. Ombrello"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/ap8ts90a3kww4.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.03341",
  "fulltext_url": null,
  "id": "ap8ts90a3kww4",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.03341",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.flu-dyn"
    ],
    [
      "arxiv",
      "physics.ins-det"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.03341",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-02",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/ap8ts90a3kww4.ris",
  "sources": [
    {
      "first_seen": "2026-11-03T12:21:04Z",
      "native_id": "2611.03341",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.03341"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.ins-det",
      "subfield": "applied-instrumentation"
    },
    {
      "field": "physics",
      "origin": "arxiv:physics.flu-dyn",
      "subfield": "fluid-dynamics"
    }
  ],
  "title": "Dual-Band Mid-Infrared Imaging for Measurement of Fuel Concentration and Temperature in a Supersonic Cavity",
  "title_text": "Dual-Band Mid-Infrared Imaging for Measurement of Fuel Concentration and Temperature in a Supersonic Cavity",
  "type": "preprint",
  "updated_at": "2026-11-05T15:20:21Z",
  "url": "https://research.draconitic.com/paper/ap8ts90a3kww4",
  "venue": "arXiv",
  "versions": []
}