Title: Device for measuring the density of a fluid

Abstract: 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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Inventors: Wenger, Alfred (Langenbruck, CH)

Application Number: 925751
Filing Date: 1978-07-18
Publication_date: 1979-12-11
Assignee: Institut Straumann AG (CH)
Primary Class(es): 73/32A 702/137
Other Classes:
US Patent Ref:

4037459	Jul, 1977	Schlatter	73/32.
4064739	Dec, 1977	November et al.	73/32.

Other Refs:
Primary Examiner: Gill, James J.
Assistant Examiner:
Attorney: McGlew and Tuttle