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Radiometric Measurement

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Radiometric Measurement

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Radiometry is the measurement of energy or power in electromagnetic radiation fields or light. The average output power is the most common radiometric measurement since many light sources, including CW lasers and LEDs, emit output power that is constant over time. For a pulsed source, the pulse energy is typically the radiometric unit of measure, although the average output power can be given as well. Since sources can have different spatial distributions and divergences, other parameters may be needed to fully characterize their outputs. For this reason, this section will discuss the most commonly-encountered radiometric quantities for measuring power and energy (see Table 1). There can be considerable confusion regarding the nomenclature of radiometric terms, which can lead to measurement errors if not properly understood. The discussion below aims to adhere to the International Commission on Illumination (CIE) system, which fits well with the SI system of units. For a more complete description of radiometry, its history, and its concepts.

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