Acceleration measuring device

Claim 1

An angular accelerometer for detecting the angular acceleration of an object about a rotational axis thereof comprising first and second tilt sensors of the torque-balance type oriented in the same direction to be sensitive to accelerations occurring in the direction in which the object rotates, said first and second tilt sensors being spaced from each other in a direction transverse to the direction of rotation of the body and at different distances from the axis of rotation of the object, each of said tilt sensors being capable of providing an output signal containing a component representative of the angular acceleration of the body, a differential amplifier connected to said first and second tilt sensors to receive as inputs thereto the outputs of said tilt sensors and to derive a difference output signal therefrom, a first integrator connected to said differential amplifier so as to be operable to integrate the output signal therefrom to provide an output signal related to instantaneous velocity of the rotating object, and a second integrator connected to said first integrator to receive the output signal therefrom and to be operable to integrate the output signal from said first integrator to provide an output signal related to the angle of swing of the rotating object.