于实验装置设计方案存在缺陷. 提出了实验装置改进方案，一是引入拉力传感器取代狭缝刀口和悬挂重物，改变反射波的形

成机理，并以弦线张力直接测量取代砝码重力间接计算; 二是引入机械结构微调弦线长度以改变弦线张力和弦线上驻波波长.

实验结果证明，改进后的实验装置能明显改善上述问题，该装置还可实施研究驻波规律的多个实验方案。

improvements on the experiment equipment are provided. On the one hand，directly measurement of string tension

instead of the weights is introduced to measure the string tension; on the other hand，a micro-adjustment

mechanism is assembled to slightly change the length and the tension of string. Thus，experiments on relations of

string tension，wavelength，frequency and string density can be carried more accurately and conveniently.