介绍了一种光传感器,它的结构原理以及XJ - 2 型控温仪如何实现对轧制钻头轧制温度的控制。 关键词: 光传感器; 感应加热; 硅光电池; 辐射强度 Abstract :A photo sensor is introduced , its construction priciple and how XJ22 type temperature control instru2ment performs the control of the rolling temperature of rolled drills. Key words :photo sensor ; induction heating ; silicon photo cell ; radiant intensity