Piezoelectric Sensor Frequency Response Calibration for Folding Boxboard Converting
Piezoelectric sensor frequency response calibration prevents amplitude distortion during high speed creasing by matching amplifier cutoff to rule strike transients.
Frequency Response Calibration
Signal Response
Electronic sensor adjustment across specified acoustic or vibration bandwidths establishes uniform measurement sensitivity across the full spectrum of operational frequencies. Executing frequency response calibration ensures that ultrasonic pulp consistency monitors and inline structural vibration sensors yield accurate readings across varying production speeds. Reference signals spanning the target frequency range are applied to the sensor, and output amplitudes are recorded against certified master standards.
Corrections are compiled into a digital transfer function matrix stored within the instrument memory. Calibration corrects signal attenuation and mechanical resonance artifacts before pulp slurry or paper web measurements are processed. The procedure stops applying outside the designated linear frequency range or when sensor diaphragms suffer physical erosion.
Measurement Mechanism
Signal generators sweep sinusoidal frequencies across the active measurement range while standard transducers measure response outputs. Signal amplification curves are calculated by comparing input voltage levels against sensor output voltages. Digital filters compensate for hardware gains to perform frequency response calibration across the spectrum.
Operational Limit
Pulp consistency transmitters rely on vibration frequency attenuation to infer fiber mass in suspension. Uncalibrated sensors introduce errors into wet-end chemical dosing loops, altering sheet formation and basis weight uniformity. Paper machine web tension monitoring systems utilize high-frequency piezoelectric transducers that require annual frequency response calibration to detect rapid mechanical vibration anomalies.
Temperature shifts inside paper mill environments degrade transducer sensitivity, necessitating periodic recalibration under operating thermal conditions.