Measuring and testing – Vibration – Resonance – frequency – or amplitude study
Reexamination Certificate
2007-01-23
2007-01-23
Chapman, John E. (Department: 2856)
Measuring and testing
Vibration
Resonance, frequency, or amplitude study
C073S061750
Reexamination Certificate
active
10800130
ABSTRACT:
A measuring apparatus for detecting a change in frequency of a piezoelectric vibrating reed is realized with a simple circuit. The circuit of the measuring apparatus includes a phase lock loop circuit20which includes a phase comparator22, a loop filter24, and a voltage-controlled oscillator26. An oscillator circuit10of a piezoelectric vibrating reed12is connected to the phase comparator22. An output terminal30is provided downstream of the loop filter24. In a method for measuring mass from a change in oscillation frequency of the piezoelectric vibrating reed12, an input signal from the piezoelectric vibrating reed12is input to the phase comparator22of the phase lock loop circuit20and the oscillation frequency of the piezoelectric vibrating reed12is obtained based on the output from the loop filter24of the phase lock loop circuit20.
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Chapman John E.
Harness & Dickey & Pierce P.L.C.
Seiko Epson Corporation
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