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What is the diameter of a narrow beam transducer?

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in Biomedical Instrumentation by (76.6k points)
What is the diameter of a narrow beam transducer?

(a) 15 mm

(b) 20 mm

(c) 25 mm

(d) 30 mm

This question was posed to me in an online interview.

My doubt stems from Oximeters topic in chapter Oximeters of Biomedical Instrumentation

1 Answer

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Best answer
Correct option is (c) 25 mm

Easiest explanation: The narrow beam transducer uses a single ultrasound transmitter/receiver piezo-electric crystal pair. The maximum ultrasound intensity is generally kept below 25 mW/cm2. The typical transducer diameter is 25 mm. The narrow beam transducer is very sensitive and produces a good trigger signal for instantaneous heart rate determination.

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