Discussion
A Wheatstone bridge is commonly used in biomedical transducers for
Answer: D
A Wheatstone bridge is used for strain gauge-based pressure measurement.
A strain gauge changes its resistance by only a tiny fraction when strained. Placed in a Wheatstone bridge, often with four active gauges on a diaphragm, that small change unbalances the bridge and gives a voltage proportional to pressure, with temperature effects largely cancelled. Disposable invasive blood pressure transducers work this way.
ECG amplification uses instrumentation amplifiers, not a bridge. Optical imaging uses photodetectors, and ultrasound is generated by driving piezoelectric crystals.
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