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9 Characterisation of Flow Properties at the Surface
(a) Passive transducer with strain gauges
(b) Passive transducer with variable reluctance
Fig. 9.5 Passive pressure transducers
(a) Active transducer with diffused piezoresistive
element
(b) Active transducer with piezoelectric
element
Fig. 9.6 Active pressure transducers
Fig. 9.7 Piezoresistive transducers of semi-conductor type diffused in a silica diaphragm