随着旋转机组容量的增大,其振动的测量已由轴承逐步转向轴本身,对一个高速旋转的轴表面进行接触测振,当然要克服许多困难;一般非接触涡流式测振虽然简单,但测得的结果是轴相对于轴承的振动,而不是轴本身的绝对振动。本文介绍一种新型涡流式轴绝对振动测量仪,它可以直接测得轴表面振动幅度的绝对量。全套仪器包括:涡流式绝对振动传感器、前置放大器(它们之间用长达十二米的同轴高频电缆连接)、低频放大器及供电电源。另外在低频放大器的输出端可连接0—10mA的指示仪表或记录装置。本文着重介绍仪器的基本原理及传感器的结构设计,限于篇幅,对电路部分不赘述。 With the increase of the capacity of rotating unit, the measurement of its vibration has been gradually turned from the bearing to the shaft itself. It is of course necessary to overcome many difficulties to contact vibration measurement on a high-speed rotating shaft surface. Although general non-contact vortex vibration measurement is simple, The result of the measurement is the vibration of the shaft relative to the bearing, not the absolute vibration of the shaft itself. This article describes a new type of eddy current shaft absolute vibration measuring instrument, which can directly measure the absolute amount of vibration amplitude of the shaft surface. The complete range of instruments includes: Vortex-type absolute vibration sensors, preamplifiers (connected with up to 12 meters of coaxial high frequency cable), low frequency amplifiers and power supplies. Also in the low-frequency amplifier output can be connected 0-10mA indicating instrument or recording device. This article focuses on the basic principles of the instrument and the sensor structure design, due to space limitations, the circuit will not repeat them.