Appeal No. 1997-1892
Application 08/209,638
7, 12 and 13.
The disclosed invention relates to a quartz oscillator
and an instrument for chemical measurement using the quartz
oscillator. The chemical measuring instrument according to
the invention employs a quartz oscillator for detecting a
physicochemical change of a substance. In one embodiment, the
quartz oscillator comprises a quartz crystal substrate, a
first electrode disposed on the quartz crystal substrate and
having at least two separate electrode portions for contact
with a substance to detect a physicochemical change in the
substance, and a second electrode disposed on the quartz
crystal substrate. In one chemical measuring instrument
embodiment, the instrument for detecting a physicochemical
change in a substance comprises a piezoelectric
characteristic-measuring circuit having an output signal line
connected to two capacitors in parallel with the separate
electrode portions of the first electrode. An input signal of
the piezoelectric characteristic-measuring circuit is
connected to the second electrode. The piezoelectric
characteristic-measuring circuit can measure the resonant
-2-
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