A333 Series

The Sherborne Sensors’ A333 Series of Tri- Axial Servo Accelerometers measure vector acceleration with high accuracy using a closed loop force balance torquer mechanism. A pendulous mass develops a torque proportional to the product of its mass unbalance and the applied acceleration. The movement of the mass is detected by a position sensor whose output signal is connected to a servo amplifier.

The resulting current is fed into the torque motor which then develops a torque exactly equal to, but directly opposed to the initial torque from the pendulous mass. The mass then stops moving, assuming a position minutely differing from it’s initial zero ‘g’ position. Simultaneously, the current to the torque motor is fed through a stable resistor to provide an output voltage proportional to the applied acceleration. The system is electronically damped by means of a phase-advancing network within the integrated servo amplifier.

By adjusting the parameters of the servo amplifier and related electronic networks, the operating characteristics of a servo accelerometer have been optimised in the A333 for ultra-low frequency vibration measurement,  particular useful structural health monitoring applications.

For more information on the A333 series, please contact us.