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최효성,유명훈,장찬용,권혁인,송상헌 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.5
We compared the displacement sensitivity between the first two symmetrical flexural resonantmodes of a tuning fork crystal oscillator. An optical chopping method was employed to detect thevibrational modes of the tuning fork. Displacement sensitivities for the first two modes were extractedby applying a sinusoidal excitation voltage to the tuning fork crystal oscillator and detectingthe oscillating amplitude of the focused laser beam chopped by the vibrating tine of the oscillator. We found that the ratio of the second mode sensitivity to the first one was 0.0113, in reasonableagreement with the theoretical value of 0.0131.