作为SNOM的关键技术之一，样品与探针间距的控制尤为重要，而实现起来比较困难。
As one of key techniques of SNOM, sample tip distance regulation is important and difficult to realize as well.
实验还测定了间距大小对磁探针输出信号的影响，给出了磁探针对阶跃实验的响应波形。
The influence of the crevice width to the gauge output was also tested, the response of jump test was obtained.
利用结构对称的双压电陶瓷传感器实现了切变力的探测，并为探针-样品的间距控制与成像提供了一种有效手段。
Shear force detection is carried out by using a symmetric piezoelectric bimorph sensor, which provides an easy way not only for probe-surface distance control but also for imaging.
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