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Which of the following transducer is used to detect foetal heart movements over a wider area?

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Which of the following transducer is used to detect foetal heart movements over a wider area?

(a) piezo-electric

(b) ultrasonic

(c) array

(d) pressure

I have been asked this question in homework.

This intriguing question comes from Oximeters topic in division Oximeters of Biomedical Instrumentation

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The correct option is (a) piezo-electric

To elaborate: The broad beam transducers are available in many configurations. The transducers comprise a number of piezo-electric crystals mounted in such a way as to be able to detect foetal heart movements over a wider area.

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