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1. 发明申请

WO1979000369A1 METHOD AND DEVICE FOR MEASURING OR DETECTING A MECHANICAL CHANGE OF STATE OR ITS TIME DERIVATIVE 审中-公开
标题翻译：用于测量或检测机械状态或其时间衍生的机械变化的方法和装置
公开(公告)号：WO1979000369A1
公开(公告)日：1979-06-28
申请号：PCT/SE1978000082
申请日：1978-11-23
申请人： STANGAKONSULT C , JILKEN L
发明人： STANGAKONSULT C
IPC分类号： G01L01/12
CPC分类号： G01N27/72 , G01L1/125 , G01L1/127
摘要： A method is described for measuring a change in the mechanical state aiming at detecting the disturbance the change in state has on a magnetic flux (o). This flux is brought to flow through at least a part of the body (1) under the influence of a driving magnetizing force (H0). In order to achieve an unambiguous measuring result the average length ((Alpha)) of the magnetic circuit is kept constant and independent of the change in the mechanical state. The flux (o) consists partly of a main flux (o0) having a definite direction and being of such a magnitude that the magnetic properties of the body depart from the region of irreversibility and partly of an alternating, gradually vanishing flux (oy) superimposed upon the main flux. The alternating flux must have such an initial magnitude that saturation is obtained in both directions of the alternating flux (ov). After the vanishing of the alternating flux (ov the disturbance generated through the change in the mechanical state is indicated or registered as a voltage which is induced by the change in flux corresponding to the disturbance. A device which works as explained above comprises means for generating the flux (o) through the body (1) which is arranged to form a magnetic circuit with at least a part of the body (1). This circuit should be essentially free from air gaps and have an average length ((Alpha)) for the driving magnetic force (H0) which is independent of the change in the mechanical state. The device is arranged to force partly the main flux (o0) and partly the superimposed alternating flux (ov) through the magnetic circuit. By means of a coil system (5) connected to a measuring or indicating device (8) the change in flux corresponding to the disturbance caused by the change in state is detected.

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