La Coste地震计的原理及其应用

本文讨论了旋转型La coste地震计的原理和各种悬挂方式及其周期表达式。指出消除“拐腿”效应和振幅效应的最好办法是采用零长弹簧（l=0）并使绞链簧片的弹率c1=-M′（0）否则,地震计将表现为正“拐腿”效应、正振幅效应或反效应,它们严重地阻碍着固有周期的增长。绞链簧片弹率c1固定后,地震计只能工作在对应的周期。列举了满足La coste悬挂条件时各种因素变化对周期和零点的影响。

PRINCIPLE OF LA COSTE SEISMOMETER AND ITS APPLICATION

In this paper,the principle and applications of the La Coste seismomtter are discussed. In order to eliminate "cripple" effect and amplitude effect,the zero-length spring （l=0） and the hinge with spring rate c1=-M' （0） are adopted. This is a hest method. If not,these effects will result in a positive effect or an inverse effect.There are three kinds of suspension forms: is a right-angle suspension for recording the ground motion of vertical component is an acute-angle suspension for recording the ground motion of horizontal component or at special angle. is an obtuse-angle suspension for recording the ground motion of horizontal component or at special angle.The changes of period and zero-point caused by various factors are listed in table 1.