VIBRATION DETECTION CIRCUIT AND SEISMOMETER

摘要

PROBLEM TO BE SOLVED: To improve characteristics in the low-frequency range by a small-scale circuit configuration using general-purpose elements in a vibration detection circuit for amplifying the output of a vibration sensor and inputting it to a processing circuit. SOLUTION: The vibration detection circuit includes: a first amplifier circuit for differentially amplifying first and second output signals from the vibration sensor in which the vibration of an object appears as a potential difference; a low-pass filter for allowing components with a frequency less than a predetermined frequency contained in the output signals of the first amplifier circuit to pass through; a second amplifier circuit for amplifying at least components with a frequency equal to the predetermined frequency or more contained in the first output signal; and a third amplifier circuit for amplifying the output signal of the second amplifier circuit with the output signal of the low-pass filter set to be a standard voltage. COPYRIGHT: (C)2009,JPO&INPIT