photoelectric threshold contrast

例句：

1. 1.The photoelectric sensor is used to detect the presence of light in a dark environment.
   光电传感器用于检测黑暗环境中的光。
2. 2. The photoelectric threshold contrast is crucial for the performance of the device.
   光电阈值对比对于设备的性能至关重要。
3. 3.The engineers adjusted the settings to optimize the photoelectric threshold contrast.
   工程师调整了设置以优化光电阈值对比。