Jisho

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Noun
1. radiometer
Wikipedia definition
2. RadiometerA radiometer is a device for measuring the radiant flux (power) of electromagnetic radiation. Generally, the term radiometer denotes an infrared radiation detector, yet it also includes detectors operating on any electromagnetic wavelength. A common example is the Crookes radiometer, an early-model device wherein a rotor (having vanes which are dark on one side, and light on the other) in a partial vacuum spins when exposed to light.
Read “Radiometer” on English Wikipedia
Read “放射計” on Japanese Wikipedia
Read “Radiometer” on DBpedia

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