论文部分内容阅读
示波法是当今物理实验教学中一种先进的方法,它能使许多看不见的实验现象直观而又准确地显示出来.凡是能把所要观察的信号转换为电压信号的系列实验,都可以用示波法来演示. 一、观察阻尼振动的图象实验装置如图1所示. 在示波器的Y输入和地之间串联一个喇叭,把示波器上的Y轴衰减置“1”,Y铀增益转到最大,扫描范围置“10～100”挡,适当调节扫描微调,使示波器屏上显示一条稳定的扫描基线.把塑料瓶盖取下,将瓶口正对喇叭,用橡皮槌敲塑料瓶使之振动,每敲一次,塑料瓶便产生一次阻尼振动,对外辐射声波,当声振动传入喇叭时,喇叭的纸盆便带动音圈在磁场中振动,从而感生一个音频电压输入示波器,于是在示波器中就显示一次阻尼振动的图象.如高中物理(甲种本)p.294图9-11所示.
Oscillography is an advanced method in physics experiment teaching. It can make many invisible experimental phenomena appear intuitively and accurately. Any series of experiments that can convert the signal to be observed into a voltage signal can be used. The oscillometric method is used to demonstrate. Firstly, an image experimental device for observing damping vibration is shown in Fig. 1. A horn is connected in series between the oscilloscope’s Y input and ground, and the Y-axis of the oscilloscope is attenuated by “1”. Y uranium gain Turn to the maximum, set the scan range to “10 ~ 100” block, adjust the fine adjustment of the scan properly, so that the oscilloscope screen displays a stable scan baseline. Remove the plastic cap, the bottle is facing the horn, knock the plastic bottle with a rubber mallet To make it vibrate, every time you knock, the plastic bottle will produce a damped vibration. When external sound waves are radiated, when the sound vibration is transmitted to the horn, the horn cone will drive the voice coil to vibrate in the magnetic field, thus inducing an audio voltage input to the oscilloscope. Then, an image of damped vibration is displayed in the oscilloscope. For example, high school physics (a type) p.294 is shown in Figure 9-11.