晶体压杆式压力传感器的动力传输性质

一般晶体压杆传感器的测时间隔均受压杆长度的限制。为此,我们研究了压杆的动力学性质。结果表明,要获得正确的压力波形,应设法减弱存在于压杆顶端部的径向振动和压杆尾端反射波对入射压力脉冲的干扰。本文提出波速色散压杆的设计,从而使传感器的性能改善,其最大优点在于测时间隔不受杆长的限制。

THE DYNAMIC TRANSMITTING PROPERTIES OF A PIEZO-ELECTRIC PRESSURE BAR TRANSDUCER

The measuring time permitted for a pressure bar transducer is usually limited by the length of the pressure bar itself. To overcome this, we have studied the dyna-mic transmitting behavior of the pressure bar. Our results show that to obtain the correct pressure profile, one must reduce both the radial vibration in the neigh-borhod of the top end of the pressure bar, and the interference of reflected waves from the lower end with the incident wave. This paper presents a design for a pres-sure bar based on the principle of wave velocity dispersion, by which the perfor-mance of the transducer is greatly improved. The chief merit of the present design is that the permitted measuring time is no Longer limited by the length of the pres-sure bar.