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What is used to convert the movement of transducer due to an increase of tension in uterus into an electric signal?

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What is used to convert the movement of transducer due to an increase of tension in uterus into an electric signal?

(a) AC Amplifier

(b) Strain guage

(c) Synchronous detector

(d) piezoelectric crystal

The question was posed to me by my college professor while I was bunking the class.

Enquiry is from Ear Oximeter in portion Oximeters of Biomedical Instrumentation

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Right choice is (b) Strain guage

Explanation: The transducer carries a protruding tip which is pressed to the mother’s abdomen with a light force to ensure an effective coupling. The protruding surface of the transducer is displaced as the tension in the uterus increases. This movement is converted into an electrical signal by a strain gauge in the transducer housing. The abdominal transducer provides a reliable indication of the occurrence frequency, duration and relative intensity of the contraction.

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