n.太阳热力计；日温计
An instrument in which a mirror is automatically moved so that it reflects sunlight in a constant direction. It is used with a pyrheliometer to make continuous measurements of solar radiation. 定日镜一种仪器，装有一面会自动调控的镜子，以便不断朝某一恒定方向反射日光。与太阳热量计同时使用，以保持对太阳辐射的不间断测量
An instrument in which a mirror is automatically moved so that it reflects sunlight in a constant direction.It is used with a pyrheliometer to make continuous measurements of solar radiation. 定日镜一种仪器，装有一面会自动调控的镜子，以便不断朝某一恒定方向反射日光。
Angstrom compensation pyrheliometer 埃斯特朗补偿太阳热量计
michelison bimetallic pyrheliometer 迈克尔逊双金属直接日射计
absolute ( self-calibrating ) pyrheliometer 绝对直接日射表
