Which sensor is defined as a spiral-wound tubular element that coils and uncoils with pressure changes?

Which sensor is defined as a spiral-wound tubular element that coils and uncoils with pressure changes?

• A. Flat membrane that deflects with temperature
• B. Piezoresistive strip
• C. Spiral-wound tubular element that coils and uncoils with changes in pressure
• D. Fiber optic coil sensor

Answer: (C)

Spiral Bourdon tubes in pressure sensing rely on a spiral-wound tubular element that coils and uncoils as pressure changes. When pressure rises, the spiral tends to unwind slightly, producing a measurable displacement that can drive a pointer or transducer. This mechanical response is what makes this element distinct from other pressure-sensing approaches. A flat membrane deflects under pressure but isn’t a spiral tube; a piezoresistive strip detects strain through resistance change in a solid-state element; a fiber optic coil sensor detects changes in light within a coil of fiber rather than a spiraled metal tube. Therefore, the described element matches the spiral-wound tubular element used in spiral Bourdon tube pressure sensors.

Spiral Bourdon tubes in pressure sensing rely on a spiral-wound tubular element that coils and uncoils as pressure changes. When pressure rises, the spiral tends to unwind slightly, producing a measurable displacement that can drive a pointer or transducer. This mechanical response is what makes this element distinct from other pressure-sensing approaches. A flat membrane deflects under pressure but isn’t a spiral tube; a piezoresistive strip detects strain through resistance change in a solid-state element; a fiber optic coil sensor detects changes in light within a coil of fiber rather than a spiraled metal tube. Therefore, the described element matches the spiral-wound tubular element used in spiral Bourdon tube pressure sensors.