radiometer
- n meter to detect and measure radiant energy (electromagnetic or acoustic)
- In a companion experiment, an infra-red radiometer will also scan Venus to get readings on temperature and atmospheric conditions.
- The most complex cluster of equipment is housed forward near its two TV cameras, and includes an infrared radiometer that measures the heat of planets and spectrometers to analyze .
- He employs the Nichols radiometer, a delicate instrument worked by heat, like the little vanes revolved by sunlight in optician's windows.