Low the earthquake sensor null base material which uses the frequency which possesses high mechanical quality coefficient folding pendulum and that kind of

摘要

The present invention relates to folding pendulum with support and the (F), and the test mass (PM), simple pendulum and (SP), and inverted pendulum (IP). Joint system four corresponding through (G), one end of the inverted pendulum and pendulum is connected to the proof mass (PM), and the other end is connected to the support (F). Test mass to vibrate freely are not connected to the support. Each joint system for the (SP) single pendulum comprises a joint tensile of one or more, pendulum folding book, is characterized in that each joint system inverted pendulum on (IP) (But) comprises a compression joint of one or more. The present invention relates to seismic sensor using a pendulum folding according to the present invention.