| 摘要 |
The device includes an oscillation body and an electronic circuitry component connected to an oscillation detector and to plural oscillation generators, and including a period of frequency meter, phase shifters supplying the generators with an excitation signal shifted in phase relative to the detector signal, and a modulator. The phase angle between the detector and excitation signals, and the oscillating frequency, are varied substantially periodically within a given interval at a frequency which is lower than the oscillation frequency. Control elements control the phase and frequency position of the interval as a function of the variation of the ratio of the detector signal to the excitation signal, and of the relation between the variations, within the interval, of the detector and excitation signals and the phase angle therebetween.
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