Asymmetrical Rocker Acceleration Sensor Stress Compensation

The single seismic mass is divided into two separate seismic masses (first and second seismic masses), each capable of independent rotational movement. This segmentation allows the sensor to distinguish between stress-induced movements (affecting both masses similarly) and acceleration-induced movements (affecting masses in opposite directions), thereby improving measurement precision while maintaining manageable device complexity

The patent introduces an intermediary evaluation method that processes signals from both seismic masses. By comparing the rotational movements of the two masses, the system can identify and filter out stress effects that affect both masses equally, while detecting acceleration effects that cause opposite movements. This intermediary processing layer resolves the contradiction by adding computational complexity rather than physical complexity

The patent employs asymmetrical design in the seismic masses with different moments of inertia about their rotation axes. This asymmetry is intentional and controlled, allowing the masses to respond differently to stress versus acceleration. The asymmetrical configuration provides inherent stress compensation because stress effects manifest differently on each mass compared to acceleration effects, improving reliability without requiring ultra-precise assembly tolerances

The patent uses partial compensation through signal processing rather than perfect mechanical compensation. By taking measurements from both seismic masses and processing them to partially eliminate stress effects, the system achieves adequate stress resistance without requiring manufacturing precision that would be needed for perfect mechanical compensation

The patent merges the functions of stress detection and acceleration detection into a unified system using two seismic masses. Rather than adding separate stress sensors and acceleration sensors, the system combines both detection capabilities in a single integrated structure where the same seismic masses serve dual purposes. The evaluation device merges the signals from both masses to simultaneously extract stress and acceleration information, improving measurement precision without proportionally increasing device complexity

The two seismic masses serve multiple functions: they detect acceleration, detect stress, and provide reference signals for each other. Each seismic mass is not just a simple indicator but a multi-functional element that contributes to both stress compensation and acceleration measurement. This universality reduces the need for additional components, thereby limiting the increase in device complexity while achieving improved measurement precision