A Temperature-Pressure Dual-Mode Flexible Patch Sensor with Temperature Compensation and Pressure Decoupling...

Area of Science:

• Materials Science
• Biomedical Engineering
• Wearable Technology

Background:

• Conventional flexible pulse sensors are often single-mode, limiting their accuracy due to interference from temperature fluctuations.
• Developing integrated dual-mode sensors is difficult due to challenges in decoupling pressure and temperature signals.

Purpose of the Study:

• To develop a dual-mode flexible patch sensor for accurate and continuous human pulse wave detection.
• To overcome the limitations of single-mode sensors by effectively decoupling pressure and temperature signals.
• To enable interference-resistant physiological monitoring under dynamic thermal conditions.

Main Methods:

• A novel dual-mode flexible patch sensor with a unique "compass-like" structural design was fabricated.
• The sensor's pressure detection range (50 Pa-200 kPa) and response/recovery times (60/96 ms) were evaluated.
• An integrated temperature-sensing unit with 0.1 °C resolution was incorporated.
• The sensor's ability to decouple pressure and temperature signals was tested, showing minimal resistance fluctuations (0.102% up to 30 kPa).
• Real-time temperature compensation of the pressure signal was achieved using the independent temperature signal.
• The compensated pressure signal's temperature drift was measured across a range of temperatures (5-45 °C).
• A ResNet-based deep learning model was integrated for pulse signal classification.

Main Results:

• The dual-mode sensor demonstrated robust pressure decoupling from temperature signals.
• The compensated pressure signal exhibited minimal temperature drift (41 × 10^-6 °C^-1).
• The sensor enabled stable, interference-resistant monitoring of radial artery pulse waves.
• Integration with a deep learning model achieved 97.6% accuracy in classifying diverse pulse signals.

Conclusions:

• The developed dual-mode flexible sensor offers an effective solution for interference-resistant wearable electronics.
• This technology has significant potential for intelligent disease diagnosis and sports health management.
• The unique structural design facilitates stable and accurate pulse wave monitoring under dynamic thermal conditions.