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What is used to recover the signal, which is analogue of the flow rate being measured?

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What is used to recover the signal, which is analogue of the flow rate being measured?

(a) Low-pass filter

(b) Phase sensitive detector

(c) Gating Circuit

(d) Bandpass filter

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The question is from Cyber Medicine topic in portion Telemedicine Technology of Biomedical Instrumentation

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The correct answer is (b) Phase sensitive detector

For explanation I would say: A phase sensitive detector is used to recover the signal, which is an analogue of the flow rate being measured. This type of demodulator not only offers maximum signal-to-noise ratio but also helps in the rejection of interfering voltages at frequencies well below the carrier frequency.

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