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Author: search.filters.author.Sooraksa, PitikhateSubject: search.filters.subject.Tuning fork

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    Force sensor and its application to tuning fork response measurement
    (2013-10-29)
    Areejit, Suwilai
    ;
    Jansri, Anurak
    ;
    Sooraksa, Pitikhate
    Generally, force measurement of nano-scale material widely employs a quartz tuning fork which is resonant mechanical sensors on 32.768 kHz resonance frequency and is powerful tools. But, this paper designs the sensor by using tuning fork on 3 kHz and modifies the tuning fork by a tiny pin adhesive into the end of prong. In experiment, measurements of electrical signal from piezoelectric are study of load-mass effect and pin position. 2 touching techniques are considered: a shear-force type and a tapping mode type with highly position movement system. Silicone rubber, vinyl eraser and hydrogel are elastic material for testing. Results show that both weight and position of pin is significant influencer for resonance frequency and quality factor of sensor. Finally, the tuning fork response experimentation shown this method can be applied to material classification. © (2013) Trans Tech Publications, Switzerland.
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    Phase difference technique for material classification by using tuning fork with piezoelectric resonator
    (2013-10-07)
    Areejit, Suwilai
    ;
    Sooraksa, Pitikhate
    ;
    Aoyama, Hisayuki
    A tuning fork with piezoelectric (TFP) is an electro-mechanical device; its principle performance is based on specific frequency and limited voltage. As the principle, the device can result output significantly. This paper presents a material classification using phase difference value that is received from touching between material and modified TFP. For the modified TFP, it is customized by a millimeter needle. The frequency response method on Bode plot is used to observe the modified TFP behavior, and to select a specific frequency. The first-order model with cascade notch filters is employed to identify mathematical model of the TFP, and to verify the model by simulation. Experimentation is considered on 2 touching techniques: a shear-force type and a tapping mode type. There are hard plastic, iron, silicon rubber, vinyl eraser and hydrogel for test material. The results are described by both time series plots of input-output signals and numerical table of shifted phase. The technique can employed to classify the test materials effectively and explicitly. © (2013) Trans Tech Publications, Switzerland.