The piezoelectric crystals inside the tuning fork are excited by the electronics of LSV, causing the tines to vibrate in free air at their natural resonant frequency.
When times are allowed to shake, vibration amplitudes are above the threshold.
Material that touches the fork tines causes resonance to be interrupted, which causes vibration to stop.
When vibrational amplitudes are measured by electronics and fall below the threshold level, material presence is indicated.
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