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François DESVIGNES : Engineer from the École Supérieure d'Optique and the Conservatoire National des Arts et Métiers - Former Director, Société Anonyme d'Études et Réalisations Nucléaires (SODERN)
INTRODUCTION
This article deals only with the metrological aspects of characterizing optical radiation, sources, propagation in media, properties of samples and passive objects, and detectors. For a description of the structure and properties of sources, media and detectors, the reader will find several references in the bibliography of the fact sheet. .
As we shall see, photometry, taken in its broadest sense, is a difficult art, due to the complexity of the spatial and spectral distribution of radiation. For this reason, metrologists have been led to define a relatively large number of quantities that can be measured without too much difficulty, as we shall see. This complexity also means that the precision of photometric measurements often appears mediocre: a relative uncertainty of 1% corresponds to good current precision, while 10 – 4 is quite exceptional.
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Radiometry. Photometry
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"Optics and photonics"
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