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P IE Z O E L E C T R IC Q U A RT Z P ICK U P M ECH AN ISM FOR A P R E S S U R E GAUGE

When pressure is app lied to diaphragm 1, electric charges
(piezoelectric charges) are developed on the surfaces of quartz
wafers 2, which contact electrode 3 and plates 4. The am ount of
the charges is proportional to the pressure app lied to diaphragm
1. Metal plates 4 serve to transm it pressure from d ia phragm
1 to crystal wafers 2. Electrode 3 serves to conduct the
charges to the measuring instrument.
$4383$SmE,M$