noun
- An instrument that measures the intensity of radiation, especially solar radiation or ultraviolet light.
Usage: technical; scientific
Examples
- The scientist used an actinometer to measure the sun's radiation at different altitudes.
- An actinometer is essential equipment in solar energy research.
- The actinometer recorded increased UV intensity during the midday hours.
- Meteorologists rely on actinometers to collect data about solar radiation.
- The laboratory installed a new actinometer to monitor changes in light intensity.