First Evaluation of the PTN-104 Plethysmographic Sensor for Heart Rate Measurement

Abstract

The purpose of this study was to examine the accuracy of HR measurements by the PTN-104 sensor in comparison to the fingertip pulse oximeter, which is a photoplethysmographic sensor (PPG). Twelve healthy participants underwent the same protocol during a single visit. Measurements were taken after each participant completed an initial rest period of 5 minutes and after 1-minute of exercising comprising of 30 squats. Each subject had the PTN-104 sensor attached to the index finger and a fingertip pulse oximeter to the opposite one. When examining the data in aggregate, there was a strong correlation between the PTN-104 sensor and PPG for HR (r = 0.988) with a mean bias of −2.55 bpm (95 % LoA +5.0, −10.1). The PTN-104 sensor satisfied validity criteria for HR monitors, however, showed a lower accuracy for measurements at rest, which is surprising. Due to the noticed limitations, this study should be repeated with a larger group of subjects and the PTN-104 sensor should be compared to the gold standard method for measuring HR, which is ECG.

Analysis of Heart Pulse Transmission Parameters Determined from Multi-Channel PPG Signals Acquired by a Wearable Optical Sensor

“…In general, an optical sensor can operate on the transmission or reflection principle. The transmission (TRX) type of a sensor probe usually has a light source (one or more LED elements) and a photo detector placed on opposite sides of the sensed human tissue, and may have the form of a finger ring or clipthis type is often used in oximeters [32]. The reflectance (RFX) type of an optical sensor is mainly attached to the fingers or wrist, typically fixed by an elastic/textile band or integrated as part of wearable devices (fitness bracelets, smart watches, etc.).…”

Free-Space Optical Communication with an Optimized Lipschitz Exponent for Biosignal Telemetry

“…Then the Lithium Niobate Modulator (LNM) is used to control the amplitude of the optical waves. The waves are processed in the optical filter and the information is recovered using the FDM demodulator [12], [13]. The metal semiconductor metal photodetector is used at the receiver end of the free-space medium to convert the photon energy of the light into electrical form.…”