Patent ID: 9140822
Filing Date: 2015-09-22
Classification: G01H,G01V

Abstract:
1. A long-period vibration sensor comprising: an overdamped accelerometer including a casing, a magnet fixed to the inside of the casing, a detection coil disposed between magnetic poles formed due to the magnet, a bobbin configured to hold the detection coil, and a support spring configured to support the bobbin in the casing so that the bobbin can vibrate in a predetermined direction, a voltage being outputted from the detection coil when the bobbin is damped; a plurality of digital filters having different frequency characteristics from one another; a selection module configured to select one digital filter from the plurality of digital filters based on an output value of the voltage outputted from the overdamped accelerometer; and a correction module configured to correct the output value of the voltage outputted from the overdamped accelerometer using the digital filter selected by the selection module.