1. Plural of pyrheliometer; instruments that measure the intensity of direct solar radiation by detecting the heat energy from the sun.
Usage: technical; scientific; used in meteorology and solar energy research

Examples

• Scientists deployed pyrheliometers across the desert to measure solar radiation intensity.
• The weather station uses pyrheliometers to track changes in direct sunlight throughout the day.
• Pyrheliometers are essential instruments for solar energy engineers designing photovoltaic systems.
• The research team calibrated their pyrheliometers before beginning the atmospheric study.
• Pyrheliometers differ from pyranometers in that they measure only direct solar radiation, not diffuse radiation.