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Acoustic sensor principal sensing component is made up of which polymer?

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Acoustic sensor principal sensing component is made up of which polymer?

(a) PEO(Poly-ethylene oxide)

(b) PET(Poly-ethylene tetraphthalate)

(c) PVDF(Poly-vinylidene fluoride)

(d) PS(Poly-styrene)

The question was asked during an online exam.

Question is taken from Measurement of Temperature topic in chapter Patient Monitoring System of Biomedical Instrumentation

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The correct answer is (c) PVDF(Poly-vinylidene fluoride)

The explanation is: Its principle sensing components is PVDF (poly-vinylidene fluoride), which is a piezo-electric polymer. It produces charges of equal magnitude and opposite polarity on opposite surfaces when a mechanical strain is imposed on the material.

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