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- W1897383686 abstract "Geophones are highly sensitive motion transducers that have been used by seismologists and geophysicists for decades. The conventional geophone's ratio of cost to performance, including noise, linearity and dynamic range is unmatched by advanced modern accelerometers. However, the problem of this sensor is that it measures velocity, and that the linear frequency range is limited to frequencies above the natural frequency, typically at 4-12 Hz. It is shown in this paper how the sensor signal can be digitally linearized 2 decades below the natural frequency obtaining a sensor that allows the user to measure displacement, velocity or acceleration with high sensitivity and large dynamic range. NOMENCLATURE x(t) base displacement y(t) coil displacement M moving mass k suspension stiffness c suspension damping ratio f frequency ω cyclic frequency ς damping ratio H transfer function V voltage G transduction constant INTRODUCTION The geophone sensor is in principle a very simple sensor. In its simplest form, it is just a coil suspended around a permanent magnet just like a loud speaker coil/magnet system. When the coil moves relative to the magnet, a voltage is induced in the coil according to the Faraday law that we all have investigated during our high school days: think back to when you were sitting with a permanent magnet moving it inside a coil and looking at the dial gage moving. The induced voltage is proportional to the relative speed, thus the geophone sensor element is measuring velocity. igure 1. Left: An isometric and cross-sectional view of a typical geophone, after Aaron Barzilai [1], Right: his sensor type has several advantages. Because of the simple construction, the sensor element is robust and e. owever, there are some drawbacks with this type of sensor design. The sensor has two main weak points: a) a" @default.
- W1897383686 created "2016-06-24" @default.
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- W1897383686 date "2005-01-01" @default.
- W1897383686 modified "2023-09-25" @default.
- W1897383686 title "Improving the Classical Geophone Sensor Element by Digital Correction" @default.
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