CEMHTI-CNRS — Conditions Extrêmes et Matériaux : Haute Température et Irradiation

Snapshot

Why it matters internationally

CEMHTI is one of the strongest European laboratories in the field because it operates precisely in the experimentally difficult regime where emissivity cannot be separated from the problem of true-temperature measurement. Its public instrumentation pages describe infrared / visible spectroscopy by reflection, transmission, and emission. The IR-EMPOWER program confirms CEMHTI’s central role through contributions on radiative-property characterization and simultaneous temperature–emittance determination. It is a major bridge between fundamental spectroscopy, high-temperature materials science, and practical radiative metrology.

Scope of activity

Relevant units and activities

• Dedicated infrared / visible spectroscopy benches operating by reflection, transmission, and emission.
• Active high-temperature radiative-property activities documented through both the CEMHTI instrumentation pages and IR-EMPOWER contributions.

Radiative properties measured

Reflectance · transmittance · emittance (normal spectral) · simultaneous true-temperature determination coupled to emittance.

Capability envelope

• Temperature: room temperature to high temperature; laser-heated emission up to ~500–2700 K.
• Wavelength: FTIR-based IR / visible spectroscopy, approximately from 1 mm to 0.5 µm.
• Methodology: robust non-contact methodology for in-situ determination of temperature and spectral emissivity under severe experimental conditions.

Application domains

High-temperature materials under severe conditions · simultaneous temperature–emittance determination · high-temperature spectral emissivity of glasses, crystals, ceramics.

IR-EMPOWER contributions

• Leire del Campo — radiative properties by infrared spectroscopy from room temperature to high temperature: reflectance, transmittance, and emittance.
• Domingos de Sousa Meneses — simultaneous measurement of temperature and normal spectral emittance under unconventional conditions.

Why CEMHTI is a bridge laboratory

What makes CEMHTI especially significant is the breadth of its radiative- property agenda. This is not merely a laboratory that measures one emissivity number at one temperature; it works in the much more demanding regime where true temperature, optical response, and spectral emissivity must be separated under severe experimental conditions. Published work associated with CEMHTI shows robust non-contact methodologies for in-situ determination of temperature and spectral emissivity; public records show active work on spectral emissivity, transmittance, and reflectance, particularly at high temperature.

In the global ecosystem, CEMHTI matters because it is a laboratory where emissivity is treated as a spectral, temperature-dependent, experimentally nontrivial quantity — not as a tabulated constant.

External sources

• IR Emission — CEMHTI CNRS UPR3079 Orléans France
• High temperature spectral emissivity of glass and crystal — HAL