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Photonics Dictionary

actinometry

Actinometry refers to the measurement of the intensity of radiation, particularly light, with a specific focus on its ability to cause photochemical reactions. It involves quantifying the amount of radiant energy (such as sunlight or artificial light) absorbed or received by a substance or surface over a period.

Applications:

Photography: Historically, actinometry was used in photography to measure light intensity for exposure calculations.

Solar energy: Used in solar energy research and applications to measure the amount of sunlight reaching solar panels or collectors.

Photochemistry: Essential for studying the effects of light on chemical reactions, particularly in understanding reaction kinetics and mechanisms.

Environmental monitoring: Actinometry is used in atmospheric science to measure UV radiation levels and their impacts on ecosystems and human health.

Actinometric measurements can be performed using various devices and methods, such as actinometers (chemical or physical), spectrophotometers, radiometers, and other specialized instruments depending on the specific application and accuracy requirements.

The development of actinometry has been pivotal in advancing our understanding of light's interaction with matter, from early experiments in photochemistry to modern applications in diverse fields.

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