Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Robust Optical Detection Method for the Vibrational Mode of a Tuning Fork Crystal Oscillator

  • Choi, Hyo-Seung (School of Electrical and Electronics Engineering, Chung-Ang University) ;
  • Song, Sang-Hun (School of Electrical and Electronics Engineering, Chung-Ang University)
  • Received : 2015.02.08
  • Accepted : 2015.03.27
  • Published : 2015.03.31
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Abstract

We present an optical detection method for the fundamental vibrational mode of a tuning fork crystal oscillator in air. A focused He/Ne laser beam is directed onto the edge of one vibrating tine of the tuning fork; its vibrating motion chops the incoming laser beam and modulates the intensity. The beam with modulated intensity is then detected and converted to an electrical signal by a high-speed photo-detector. This electrical signal is a sinusoid at the resonant frequency of the tuning fork vibration, which is 32.76 kHz. Our scheme is robust enough that the sinusoidal signal is detectable at up to $40^{\circ}$ of rotation of the tuning fork.

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References

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