Anaes SAQs · Measurement & monitoring physics
The pressure transducer and the Wheatstone bridge
Primary physics — the diaphragm and the strain gauge, the four-resistor Wheatstone bridge that converts the small resistance change into a voltage; the zeroing, the levelling, and the damping of the arterial line.
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Prompt
Describe how a pressure is converted to an electrical signal using a strain gauge and a Wheatstone bridge, and the requirements for an accurate intra-arterial pressure measurement.
Question
Describe how a pressure is converted to an electrical signal using a strain gauge and a Wheatstone bridge, and the requirements for an accurate intra-arterial pressure measurement.
References2ShowHide
- [1]Moon K, et al. Pulse oximetry - a perioperative perspective. Diagnostics, 2026.PMID 42351472
- [42351473]Bersten AD, Soni N (eds) Oh's Intensive Care Manual. 8th edition, Elsevier, 2018.