Strain Transduction
Resistive bridges etched into a silicon micro-structure convert mechanical acceleration into voltage variations through the deformation of doped semiconductor material. A piezoresistive accelerometer utilizes these implanted elements to track inertia when the proof mass moves against its suspension springs. Full bridge configurations minimize thermal drift by balancing the resistance changes across the sensor geometry.
Bridge Impedance
Measurement accuracy relies on the stable excitation of the resistive circuit and the output linearity of the bridge. High impedance paths require careful shielding to avoid electromagnetic interference from industrial motors or power lines. Shielding prevents noise injection into the low level signal paths before amplification occurs.
Signal Conditioning
Differential amplifiers process the raw voltage output to subtract common mode noise that arises from thermal gradients across the silicon die. Offset adjustment occurs at the factory level to ensure the zero g output remains within specified millivolt bounds. Calibration against a reference shaker table establishes the sensitivity factor in millivolts per g for the specific unit.
Mounting Influence
Adhesive contact quality dictates the mechanical frequency response observed during actual site operation. Soft interfaces or improper torque on fastening bolts introduce resonances that distort the high frequency data retrieved from the sensor. Precise coupling ensures the internal silicon mass experiences the exact motion of the host structure without structural damping or unintended mechanical filtration.
