Definition of active-cavity radiometer

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Photonics Dictionary

active-cavity radiometer: An active-cavity radiometer is a highly sensitive instrument used to measure radiant energy (power per unit area), often in the form of electromagnetic radiation. The key features of an active-cavity radiometer include:

Active feedback system: It employs an active feedback mechanism to maintain a constant temperature within a cavity, which helps in accurately determining the absorbed radiant power.

Cavity design: The radiometer typically has a well-designed cavity that absorbs incoming radiation uniformly. This cavity is often coated with a highly absorptive material to minimize reflection and maximize absorption.

Measurement precision: The active-cavity radiometer is known for its high precision and stability, making it suitable for calibrating other radiometric instruments and for scientific measurements requiring accurate radiant energy quantification.

Applications: These radiometers are used in a variety of fields, including meteorology, climate science, and space research, where they measure solar irradiance, terrestrial radiation, and other forms of radiant energy with high accuracy.

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