分析了步进电机产生低频振荡的原因，提出了一种新控制方法—脉宽调整法。
The way of pulse-width adjustment which can change the size, the direction and the action time of the electromagnetic resultant force in the stepping motor.
把激光脉宽调整到与吸收颗粒的热弛豫时间一致可以避免热副作用，可对所选细胞产生选择性处理。
Adjusting the pulse width of the laser to the thermal relaxation time of the absorbing construction can avoid thermal side effects and facilitate a selective treatment of the selective cells.
在PW M脉宽调制的软件实现方法上，提出了线性积分比较法，大幅提高了脉宽调整方波的频率。
Linear integral compare method was proposed to realize PWM square wave, which can increase the wave frequency.
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