本文在基本不改变仪器固有灵敏度的前提下，采取记录光线二次反射法，以提高仪器的记录灵敏度。
In this paper we describe a method to improve the recording sensitivity by twice reflections of light ray without changing the inherent sensitivity of the instrument.
这种结构在保持了高透射率的前提下还具有金属的优点，这在传感器、护目装置、反射窗、液晶显示等诸多领域都有很大的实用价值。
The structure has high transmission and metal's advantages, so it can be used in many fields as sensor, eye protection devices, heat reflecting Windows and liquid crystal displays.
在能够获得桩底反射的前提下，脉冲宽度和敲击速度尽量小。
The pulse width and impact velocity as small as possible on the premise that can obtain reflection from the pile toe.
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