Artifact-resistant, power-efficient design of finger-ring plethysmographic sensors. II. Prototyping and benchmarking

For pt. I see ibid., p. 2792-5 (2000). A miniaturized, telemetric, photoplethymographic sensor called a "ring sensor" for long-term monitoring is presented. A prototype ring sensor is designed and built based on the power budget analysis and the artifact-resistive attachment method. It is verified through experiments that the ring sensor is resistant to interfering forces and acceleration acting on the ring body. Benchmarking tests with FDA-approved photoplethysmograph and EKG reveal that the ring sensor is comparable to those devices in detecting beat-to-beat pulsation despite disturbances.