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- Oscillator
- Characteristics
- The B.L.T. type ultrasonic vibrator is a device that complements the defects of existing ferrite type vibrators, and it produces less internal mechanical losses, delivers high electro-acoustic conversion efficiency, and generates low heat and high amplitude, which maximizes its service life and output efficiency. Its practical vibration velocity is 0.5m/sec.
- Resonant Frequency
- A piezoelectric element generates strong vibrations when changing the frequency of the element to the device-specific frequency by applying AC voltage, and the frequency at this time is referred to as the resonant frequency. Strictly, when the admittance and impedance between piezoelectric electrodes are above the zero phase, the lower frequency between two frequencies is referred to as Fr, and the resonate frequency of the series circuit on the electrical equivalent circuit of the piezoelectric element is symbolized as
Fs and Fm.
When the differences among Fr, Fs, and Fm of the piezoelectric element are extremely small, Fm measured at the maximum admittance between piezoelectric electrodes is recorded as Fr. The value "V" measured on the voltmeter vibratoris proportional to impedance when the requirement of R (vibrator impedance) is satisfied in a state in which the current flowing through resistor R and the sample is constant. The frequency measured when V is at the minimum value is the resonant frequency, Fr, while the frequency measured when V is at the maximum value is the anti-resonance frequency, Fa.
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