monochrome signal

例句：

1. 1.The color of the signal is determined by the type of light it reflects.
   信号的颜色由它反射的光决定。
2. 2. This device sends a monochrome signal to indicate the presence of an object.
   这个装置发送一个单色信号来指示物体的存在。
3. 3. The monochrome signal was received by the receiver and processed for further analysis.
   单色信号被接收器接收并进一步分析。