Research On Thermal Sensitive Mechanism Of Quartz Tuning Fork Resonator

Resonance is a phenomenon exist widely, it not only exist in ingenuous mechanical,chemical, photic, eletric, magnitic system, but also resonace phe-nomenon can be observed in each kind of system that involved above multiple energy field's energy conversion. Resonant sensor works in system's resonant state, system supports input energy in lowest loss, but to the sensitive system that works in resonant state, environment paremeter's micro change to system characterisitc parameter's modulating effect is strengthened, therefore, sensors made by resonators have some advantages such as low power consumption, out-put signal's high signal-noise ratio, strong resistance to interference. With digital circuit technique's rapid development and wide application, resonator becomes the most important research direction in sensor field. And compared with the other resonators, quartz tuning fork resonator's performance has some advan-tages, its proper size, low pow consumption, output digital signal and some other advantages make it suit for future development in this field, therefore, quartz tuning fork resonator becomes one of hot research interests in modern world.This paper mainly aims at quartz tuning fork resonator's resonant mecha-nism, finite element simulation and thermal sensitive characteristic. Fisrtly, quartz tuning fork resonator's vibration mode is analyzed, and the mechanism that make quartz tuning fork resonator generate flexural vibration is discussed. Then quartz tuning fork resonator's finite element mathematical model is estab-lished through formula derivation, and finite element analyzing software ANSYS is selected to simulate quartz tuning fork resonator's first ten order vibration mode. Then make comparison among the resonant frequency obtained by finite element analysis, resonant frequency obtained by analytical method and resonant frequency obtained by experiment. Finally, cut type's influence on quartz tuning fork resonator's thermal sensitive character, and test system is established to evaluate resonator's performance. Quartz tuning fork resonator's thermal sensi-tive charater is analyzed in MATLAB using least square method.