Radiometry Overview - Concepedia

Principles

Definition

Radiometry is the scientific field dedicated to the measurement of electromagnetic radiation. It rigorously investigates the quantitative properties of radiant energy, including flux, intensity, radiance, and spectral distribution, to characterize radiation sources and their interaction with matter.

Ontological type

Core Quantities

Measurement Techniques

Spectral Characterization

Key developments

Key Figures

Foundational Quantitative Radiometry era

Subrahmanyan Chandrasekhar, whose radiative-transfer formalism developed in the 1950s–60s, provided a rigorous link between emergent radiance and atmospheric state. Gérard van de Hulst, through Light Scattering by Small Particles (1957), established practical scattering coefficients and foundational radiative-transfer methods for atmospheric transmittance. Carl Sagan extended these concepts to planetary atmospheres in the 1960s–70s, turning theory into emissivity and surface-property inferences for remote sensing. Calibration protocols and instrument design from national laboratories translated quantum absorption results into usable radiometric standards, anchoring the measurement-to-physical-state links of early radiometry.

Radiative-Transfer and Retrieval Revolution era

S. A. Clough [1] was active at the University of California, Los Angeles [3] and the California Institute of Technology [4] during this era. This work by Clough [1] and Mlawer [2], Radiative transfer for inhomogeneous atmospheres: RRTM, a validated correlated-k model for the longwave [7], introduced a robust, efficient framework that enabled accurate radiance calculations across heterogeneous atmospheres and surfaces and underpinned operational retrievals. E. J. Mlawer [2] was associated with Brandeis University [5] and the University of Maryland, Baltimore County [6] during this era. His key contributions, as reflected in Radiative transfer for inhomogeneous atmospheres: RRTM [7], helped standardize retrieval algorithms and reference products, driving community validation and routine radiometric applications in this era.

Multiplatform Calibration and Monitoring era

Luís D. Carlos [1] is associated with the University of Washington [3] and the University of Oxford [4]. His key contributions, as described in Lanthanide-Based Thermometers: At the Cutting-Edge of Luminescence Thermometry [6], advance lanthanide-based luminescent thermometry and provide precise, non-contact radiometric sensing essential for cross-platform calibration. Carlos D. S. Brites [2] is associated with the University of Aveiro [5]. His contributions, illustrated by the Lanthanide-Based Thermometers paper [6], advance luminescence thermometry and calibration strategies for multiplatform radiometric monitoring, enabling temporal continuity and intersensor consistency.