A215/A220 Series Miniature Linear Servo Accelerometer
Overview
The Sherborne Sensors’ A200 range of 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 can be optimised to suit a particular application.
Features
- Available in ranges from ±1g to ± 20g
- High resolution down to 0.05 mg
- Closed loop force balance system
- Flight qualified versions available
- Self-Test facility
- DC Input – DC Output
- Manufactured to ISO 9001:2000 and AS9100B standards
- 1g bias option to compensate for earth’s gravity (A220 only)
Applications
- Flight test monitoring
- Accident data collection
- Structural health monitoring
- Flight simulators
- Braking control on mass transit systems
- Road bed analysis
- Data acquisition systems
- Low frequency analysis