WActinometer
WAdvanced Spaceborne Thermal Emission and Reflection Radiometer
WAlbedo
WBidirectional reflectance distribution function
WBidirectional scattering distribution function
WBolometer
WCrookes radiometer
WECOSTRESS
WEllipsometry
WEmissivity
WGardon gauge
WISO 9846
WKinetic inductance detector
WLangley extrapolation
WLeslie cube
WMicrowave radiometer
WNet radiometer
WOpposition surge
WPhase angle (astronomy)
WPhotometry (astronomy)
WPyrgeometer
WPyrheliometer
WPyrometer
WRadiant energy
WRadiation Budget Instrument
WRadiometer
WReflectance
WSolar constant
WSpecific radiative intensity
WSpectral power distribution
WSpectral sensitivity
WSuperconducting nanowire single-photon detector
WThin filament pyrometry
WTransition-edge sensor
WTransmittance