modulated light source造句

In this paper they study a position - detecting system based on microprocessor and psd ( position sensitive detector ) . the method is as follows : when the ac - signal from psd which is illuminated by modulated light source passes through an active band - pass analog filter , it filters the ac signal which represents the object light source . then the dc - converter circuit transforms it into dc - signal which is used to calculate the position
这一系统采用的方法是通过对位置敏感探测器psd受到调制目标光源照射后输出的模拟交流信号进行有源带通滤波，提取出代表目标光源的调制频率成份，再将该信号转变为用来参与位置解算的直流信号，然后选用单片机组成硬件电路，对直流信号进行采集处理并与计算机建立通信，把数据送入计算机进行位置解算，分析判别目标光源和psd器件的相对位置。
It's difficult to find modulated light source in a sentence. 用modulated light source造句挺难的