| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a long-period vibration sensor which is structurally simple and superior in convenience, and has low power consumption. <P>SOLUTION: The long-period vibration sensor includes: an overdamping type accelerometer 10A which includes a magnet fixed in a case, a detection coil arranged between magnetic poles formed of magnets, a bobbin for holding the detection coil, and a support spring for supporting the bobbin so that the bobbin can vibrates in a predetermined direction in the case, and outputs a voltage by the detection coil when the bobbin is damped; a plurality of digital filters 31<SB POS="POST">1-m</SB>which have mutually different frequency characteristics; and an arithmetic processing part 32 which selects one digital filter 31<SB POS="POST">n</SB>out of the digital filters 31<SB POS="POST">1-m</SB>on the basis of the output value of the voltage output from the overdamping type accelerometer 10A, and corrects the output value using the selected digital filter 31<SB POS="POST">n</SB>. <P>COPYRIGHT: (C)2013,JPO&INPIT |
