Pith Number

pith:D4ZK3S76

pith:2026:D4ZK3S76A43T6I3V4KF5RJS6PM

not attested not anchored not stored refs resolved

Gas temperature measurement based on contrast reversal in mid-infrared CO2 images

Hideki T. Miyazaki, Kazuya Kimoto, Masahiro Saito, Takeshi Kasaya, Tetsuyuki Ochiai, Yutaro Tsuiki

Gas temperature is given by the background temperature where the CO2 image contrast reverses in mid-infrared.

arxiv:2603.12640 v2 · 2026-03-13 · physics.optics

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\pithnumber{D4ZK3S76A43T6I3V4KF5RJS6PM}

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Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

The specific background temperature at the point when the gas image disappears provides the gas temperature.

C2weakest assumption

That the observed contrast reversal occurs precisely when gas temperature equals background temperature, without significant interference from scattering, non-uniform gas concentration, or camera calibration effects.

C3one line summary

Gas temperature equals the background temperature at which the CO2 absorption image contrast reverses and vanishes in a 4.3 micrometer mid-IR camera.

References

59 extracted · 59 resolved · 0 Pith anchors

[1] H. D. Baker, E. A. Ryder, and N. H. Baker, Temperature Measurement in Engineering, Vol. II (Wiley, 1961) 1961

[2] Review of temperature measurement 2000

[3] Measurement of flame temperature distribution by IR emission computed tomography 1985

[4] Two-dimensional temperature determination in sooting flames by filtered Rayleigh scattering 1996

[5] Rotational Raman interferometric measurement of flame temperatures 1983

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-06-25T01:17:51.754517Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1f32adcbfe07373f2375e28bd8a65e7b2cde841ad4e3e25b158d5dfdb964ced8

Aliases

arxiv: 2603.12640 · arxiv_version: 2603.12640v2 · doi: 10.48550/arxiv.2603.12640 · pith_short_12: D4ZK3S76A43T · pith_short_16: D4ZK3S76A43T6I3V · pith_short_8: D4ZK3S76

Agent API

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/D4ZK3S76A43T6I3V4KF5RJS6PM \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 1f32adcbfe07373f2375e28bd8a65e7b2cde841ad4e3e25b158d5dfdb964ced8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "00dce628a09f4e5f1f3fb2e4284f2f8369498621d65c5f5052bc7fbae382d99b",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.optics",
    "submitted_at": "2026-03-13T04:16:24Z",
    "title_canon_sha256": "5c9a5d39d13c48cc84533f1bd450e083ffb709f73165fb7a9ce20ffac19f6dca"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2603.12640",
    "kind": "arxiv",
    "version": 2
  }
}