photoelectric chopper

例句：

1. 1.The photoelectric chopper is used to detect the presence of light.
   光电斩波器用于检测光的存在。
2. 2. The photoelectric chopper was used in the experiment to measure the speed of light.
   光电斩波器在实验中被用来测量光速。
3. 3. The photoelectric chopper is a crucial component in many electronic devices.
   光电斩波器是许多电子设备中的关键组件。