Analysis method using piezoelectric resonator

Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Viscosity

Reexamination Certificate

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Reexamination Certificate

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07111500

ABSTRACT:
A piezoelectric resonator is immersed in a liquid, an AC signal is applied, and a local maximum of the conductance is determined. A frequency change due to the viscosity effect is determined from two frequencies of three frequencies including a resonance frequency that is applied at that local maximum, and first and second half-value frequencies at which a half-value conductance of half that local maximum is given. The influence of the mass effect can be eliminated, so that an accurate measurement of the viscosity change is possible. Moreover, if the substance to be analyzed that is contained in the liquid adheres to a reaction film of the piezoelectric resonator, the mass of the piezoelectric resonator changes, and the second half-value frequency is measured. It is thus possible to derive only the influence of the mass effect, since the half-value frequencies are not influenced by the viscosity effect.

REFERENCES:
patent: 3564463 (1971-02-01), Beaver et al.
patent: 4721874 (1988-01-01), Emmert
patent: 4741200 (1988-05-01), Hammerle
patent: 4862384 (1989-08-01), Bujard et al.
patent: 5201215 (1993-04-01), Granstaff et al.
patent: 5287033 (1994-02-01), Morton
patent: 6260408 (2001-07-01), Vig et al.
patent: 6334356 (2002-01-01), Kita et al.
patent: 6494079 (2002-12-01), Matsiev et al.
patent: 4-1554 (1992-01-01), None
patent: 2002-148295 (2002-05-01), None
patent: 2002-156368 (2002-05-01), None
A. Zhou et al; “Impedance analysis for the investigation of the behaviors of piezoelectric quartz crystal in the liquid at harmonic resonance”;Sensors and Actuators; vol. B 67; 2000; pp. 68-75./Discussed in the specification.
European Search Report dated Nov. 23, 2004.
Martin S J et al: “Characterization of a Quartz Crystal Microbalance With Simultaneous Mass and Liquid Loading” Analytical Chemistry, American Chemical Society. Columbus, US, vol. 63, No. 20, Oct. 15, 1991, pp. 2272-2281, XP000577312 ISSN: 0003-2700 *p. 2276-p. 2280.
Hauptmann P, Lucklum R, Hartmann J, Auge J and Adler B: “Using the Quartz Microbalance Principle for Sensing Mass Changes and Damping Properties” Sensors and Actuators A, vol. 37-38, Aug. 1, 1993, pp. 309-316, XP009039339 *p. 309-p. 311; figure 3.
Zhou A et al: “Impedance analysis for the investigation of the behaviors of piezoelectric quartz crystal in the liquid at harmonic resonance” Sensors and Actuators B, Elsevier Sequoia S.A., Lausanne, CH, vol. 67, No. 1-2, Aug. 10, 2000, p. 68-75, XP004213477 ISSN: 0925-4005 * the whole document.
Zhang C and Feng Guanping: “Contributions of Amplitude Measurement in QCM Sensors” IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, vol. 43, No. 5, Sep. 30, 1996, XP002304659 * the whole document.

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