光电通讯演示机的改进

THE IMPROVEMENT OF PHOTOCONDUCTIVE COMMUNICATION DEMONSTRATOR

过去我们实验室中自制的光电通讯演示机由于信号传输距离短（一般小于０．５ｍ），信号强度弱，转换音质差，影响教学演示效果．作者根据光学原理，在信号发射机上加装会聚装置，将发散光传输转变为平行光束传送，以提高传输信号的强度，延长传输距离；并在接收机上加装聚焦装置，进一步增强接收信号的强度．经过这样的改进，演示机的信号传输距离可延长至５ｍ以上，信号的强度和质量也大大提高，明显地改善了演示效果．此方法所用装置简易有效。

To improve the photoconductive communication demonstrator used in the teaching program in Physics,for elongating the communicating distance and enhancing the strength of transferred signal,a set of convergent device was employed.By such a modification,a distance of communication as long as 6 meters was obtained,as well as the strength and the quality of the signal received were remarkably improved.The described technique is suitable for the applications in the programs of teaching experiment and scientific research in Physics in universities.