> ## Documentation Index > Fetch the complete documentation index at: https://felimet-hub.jmcores.com/llms.txt > Use this file to discover all available pages before exploring further. # Color schlieren thermal imaging for epidemic prevention > Automation 2023 paper using color schlieren and infrared thermal imaging with PIV and RPCA to measure mask exhalation airflow velocity and temperature. export const CiteSwitch = ({bibtex = "", lang = "zh"}) => { const t = lang === "en" ? { hint: "Switch citation format", copy: "Copy", copied: "Copied" } : { hint: "切換引用格式", copy: "複製", copied: "已複製" }; const [fmt, setFmt] = useState("bibtex"); const [copied, setCopied] = useState(false); const raw = (bibtex || "").trim(); const field = name => { const m = raw.match(new RegExp(name + "\\s*=\\s*[{\"]([^{}\"]*)[}\"]", "i")); return m ? m[1].replace(/\s+/g, " ").trim() : ""; }; const typeM = raw.match(/@(\w+)/); const isConf = typeM ? 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" https://doi.org/" + doi : ""}`.replace(/\s+/g, " "); const TABS = [{ key: "bibtex", label: "BibTeX" }, { key: "ieee", label: "IEEE" }, { key: "apa", label: "APA" }]; const current = fmt === "bibtex" ? raw : fmt === "ieee" ? ieee : apa; const doCopy = () => { try { navigator.clipboard.writeText(current); setCopied(true); setTimeout(() => setCopied(false), 1500); } catch (e) { setCopied(false); } }; const css = ` .cs-root{--cs-bg:#FAF8F3;--cs-surface:rgba(0,0,0,0.025);--cs-border:rgba(0,0,0,0.09);--cs-text:#2b2722;--cs-dim:#6f6a62;--cs-faint:#8a8378;--cs-accent:#bf7551;--cs-code:rgba(0,0,0,0.04);border:1px solid var(--cs-border);border-radius:14px;background:var(--cs-bg);color:var(--cs-text);overflow:hidden;} .dark .cs-root{--cs-bg:#1b1a18;--cs-surface:rgba(255,255,255,0.03);--cs-border:rgba(255,255,255,0.08);--cs-text:#e7e3da;--cs-dim:#a8a299;--cs-faint:#8a8378;--cs-accent:#cf8a68;--cs-code:rgba(255,255,255,0.05);} .cs-head{display:flex;align-items:center;gap:8px;padding:10px 12px;border-bottom:1px solid var(--cs-border);flex-wrap:wrap;} .cs-head-ic{color:var(--cs-accent);flex-shrink:0;} .cs-hint{font-size:12px;color:var(--cs-faint);margin-right:auto;} .cs-tab{border:1px solid var(--cs-border);background:transparent;border-radius:8px;padding:5px 12px;cursor:pointer;color:var(--cs-dim);font:inherit;font-size:12.5px;font-weight:600;transition:all .15s;} .cs-tab:hover{background:var(--cs-surface);} .cs-tab-on{border-color:rgba(191,117,81,.5);background:rgba(191,117,81,.1);color:var(--cs-accent);} .cs-body{position:relative;padding:14px 15px;} .cs-pre{margin:0;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:12.5px;line-height:1.6;white-space:pre-wrap;word-break:break-word;color:var(--cs-text);} .cs-cite{font-size:13.5px;line-height:1.7;color:var(--cs-text);word-break:break-word;} .cs-copy{position:absolute;top:11px;right:12px;display:flex;align-items:center;gap:5px;border:1px solid var(--cs-border);background:var(--cs-bg);border-radius:8px;padding:5px 10px;cursor:pointer;color:var(--cs-dim);font:inherit;font-size:11.5px;font-weight:600;transition:all .15s;} .cs-copy:hover{border-color:rgba(191,117,81,.5);color:var(--cs-accent);} .cs-copy-ok{color:#5f8a52;border-color:rgba(95,138,82,.4);} .dark .cs-copy-ok{color:#86b274;} .cs-copy svg{flex-shrink:0;} `; return
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; }; export const PubMeta = ({type = "journal", venue, date, confType, doi, url}) => { const doiUrl = doi ? doi.startsWith("http") ? doi : `https://doi.org/${doi}` : null; const pillBase = { display: "inline-block", padding: "0.15rem 0.6rem", borderRadius: "9999px", fontSize: "0.78rem", fontWeight: 600, lineHeight: 1.6, border: "1px solid" }; const tone = { type: { color: "#8a9a7b", borderColor: "rgba(138,154,123,0.4)", background: "rgba(138,154,123,0.1)" }, venue: { color: "#c9a35b", borderColor: "rgba(201,163,91,0.4)", background: "rgba(201,163,91,0.1)" }, date: { color: "#5b6c8f", borderColor: "rgba(91,108,143,0.4)", background: "rgba(91,108,143,0.1)" }, link: { color: "#bf7551", borderColor: "rgba(191,117,81,0.4)", background: "rgba(191,117,81,0.1)" } }; const typeLabel = type === "conference" ? "Conference" : "Journal"; return
{typeLabel} {venue && {venue}} {date && {date}} {confType && {confType}} {doiUrl && DOI ↗ } {url && Link ↗ }
; }; # Epidemic Prevention Applications of Color Schlieren Thermal Dynamics Imaging Jia-Ming Zhou, and Bo-Lin Jian ## Abstract This study establishes a dual-modal visualization system integrating schlieren optics and infrared thermal imaging for quantitative analysis of respiratory airflow dynamics during mask wearing. The research employs Robust Principal Component Analysis (RPCA) to decompose dynamic imagery into low-rank matrices (background structure) and sparse matrices (dynamic targets), and utilizes Particle Image Velocimetry (PIV) to accurately measure airflow velocity field distributions. The experimental investigation compares three mask types: standard surgical masks, 4D surgical masks, and N95 respirators. Results demonstrate that exhalation velocities from standard surgical masks reach up to 0.6 m/s, whereas N95 respirators exhibit velocities below 0.35 m/s. Through dual-modal image fusion techniques, the system successfully integrates the airflow texture from schlieren images with temperature distribution information from thermal images, generating color schlieren thermodynamic imagery. The study incorporates flow velocity sensors for cross-validation to ensure analytical reliability. This innovative methodology not only reveals the blocking effects of masks on airflow propagation pathways and velocities but also provides objective scientific data to support public health epidemic prevention strategies, demonstrating significant practical application value. ## Keywords * Color Schlieren Techniques * Robust Principal Component Analysis (RPCA) * Particle Image Velocimetry (PIV) * Infrared Thermal Imaging * Impact of Masks on Respiratory Airflow ## Sample Results Demo ## BibTeX Citation