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_______________ is not a passive transducer.(a) Doppler effect transducer(b) IR sensor(c) Strain gauge(d) Ultrasonic transducerI have been asked this question at a job interview.The doubt is from Delivery Models in Telemedicine in section Telemedicine Technology of Biomedical Instrumentation

Answer»

The CORRECT option is (c) STRAIN gauge

To explain: Strain gauge transducer is an active transducer. Its working PRINCIPLE is based on change in RESISTANCE. Ultrasonic transducers need power to operate. So do the IR sensors and DOPPLER effect transducers.



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