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驻波演示实验,一般是用30cm长的弦线作振动体,电动音叉(或电磁铁)作振动源(策动力),产生的驻波小而细。通过书写投影仪投影到屏幕上,图形虽然可以放大,但不够直观。这种传统的演示方法,振动频率不能控制,驻波的形成靠调节振动体张力的大小或长短来实现,所以存在着调节困难,稳定性差等缺点。 笔者制作了一个驻波演示器,它可演示线形驻波和环形驻波。产生的驻波直观性强,波形大而稳定,振动频率连续可调,操作方便。课前准备好后,上课时只要按记录数据进行演示即可。现介绍如下,供参考。
The VSWR demonstration experiment generally uses a 30cm long string as the vibrating body and an electric tuning fork (or electromagnet) as the vibration source (driving force). The resulting standing wave is small and fine. By projecting a projector onto the screen, the graphic can be enlarged but not intuitive. In this traditional demonstration method, the vibration frequency cannot be controlled. The formation of the standing wave is realized by adjusting the size or length of the tension of the vibrating body. Therefore, there are disadvantages such as difficult adjustment and poor stability. The author produced a standing wave demonstrator, which can demonstrate linear standing wave and annular standing wave. The generated standing wave has strong intuition, large and stable waveform, continuously adjustable vibration frequency and convenient operation. After the class is ready, just press the record data to demonstrate in class. The introduction is as follows, for reference.