Quartz Tuning Fork: From Timekeeping Devices to Sensors

Synopsis

Quartz tuning forks (QTFs) serve as fundamental components in the majority of digital watches today. Despite their widespread use, the intricacies of QTF-based watch designs are often overlooked. Beyond their role in timekeeping, QTFs can function as sensing elements for various measurements. This presentation aims to illuminate the design decisions involved in quartz tuning fork-based digital watches, discuss the differences between the electronic representation for the tuning fork equivalent and its mechanical model, and explore methods for correcting any discrepancies. Additionally, examples of sensing apparatuses based on QTFs will be provided, highlighting how the shift in the resonant frequency and the impedance of the fork can be utilized for measurements.