radiometer

詳細解釋：

ra.di.om.e.ter

n.（名詞）
A device that measures the intensity of radiant energy, consisting of a partially evacuated glass bulb containing lightweight vertical vanes, each blackened on one side, suspended radially about a central vertical axis to permit their revolution about the axis as a result of incident radiation.
輻射計：檢測輻射能強度的一種裝置，裝有一個部分抽乾的玻璃管，管內有若干輕質的垂直翼，每個翼的一邊為黑色，在一個垂直的周圍輻射懸垂，在受到投射輻射時它們可以繞軸旋轉
An instrument that detects electromagnetic radiation.
輻射儀：一種測定電磁輻射的儀器

【引伸】
ra.diom.etry
n.（名詞）