1. An instrument that measures the intensity of direct solar radiation received from the sun.
Usage: technical; used in meteorology and solar energy research

Examples

• The meteorologist used a pyrheliometer to measure the sun's direct radiation on a clear day.
• Pyrheliometers are essential instruments for monitoring solar energy potential in renewable energy projects.
• The research station installed a pyrheliometer to track changes in solar intensity throughout the year.
• Scientists calibrated the pyrheliometer before conducting their solar radiation experiments.
• Data from the pyrheliometer showed that cloud cover significantly reduced direct solar radiation.