Patent ID: 6038924
Filing Date: 2000-03-21
Classification: G01P

Abstract:
A seismic accelerometer for receiving incident inertial forces and generating an output signal representative of said received incident inertial forces, comprisinga base having a vertical stud extending from the center of the base;a first directional sensing element that senses incident inertial forces in the X direction, a second directional sensing element that senses incident inertial forces in the Y direction, and a third directional sensing element that senses incident inertial forces in the Z direction; each directional sensing element connected to the vertical stud and generating a force voltage signal in response to the respective incident inertial forces applied to the accelerometer; each element having a sensitivity;a circuit that adjusts the sensitivity of the accelerometer in response to the incident inertial forces sensed by the first, second and third directional sensing elements and having three directional systems;each directional system corresponding to one directional sensing element and receiving said force voltage signal, wherein the force voltage signal passes through at least in sequence a first filter and an amplifier, and generates an output signal for said corresponding element; anda first mass over the directional sensing elements and connected to the accelerometer;wherein the sensitivity of the directional sensing elements are in direct proportion to the mass of the first mass and the adjustments by the circuit.