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Wrist Pulse Rate Monitor Using Self-Injection-Locked Radar Technology
Fu-Kang Wang1, Mu-Cyun Tang2, Sheng-Chao Su3
1Department of Electrical Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan. fkw@mail.ee.nsysu.edu.tw.
This study demonstrates radar technology for wearable vital sign monitoring. Self-injection-locked (SIL) radar offers a sensitive, low-power solution for detecting heart and respiratory rates.
Area of Science:
- Biomedical Engineering
- Electrical Engineering
- Wearable Technology
Background:
- Vital sign monitoring requires sensitive, comfortable, and durable wearable devices.
- Radar technology presents a potential solution for non-invasive physiological monitoring.
Purpose of the Study:
- To evaluate the sensitivity and power consumption of self-injection-locked (SIL) radar compared to continuous-wave (CW) radar for vital sign detection.
- To develop and assess a wearable pulse rate monitor utilizing a bistatic SIL radar architecture.
Main Methods:
- Comparative analysis of SIL and CW radar for detecting respiratory and heart rates at a distance.
- Construction of a pulse rate monitor using an active antenna with a SIL oscillator (SILO) and patch antenna.
- Modulation of the SILO with Doppler signals from wrist-based pulse detection and subsequent signal demodulation.
Main Results:
- Identified SIL radar as a promising technology for sensitive vital sign detection with lower power consumption.
- Successfully developed a wearable pulse rate monitor based on the bistatic SIL radar architecture.
- Demonstrated the capability of the device to extract pulse rate information from the demodulated SILO output signal.
Conclusions:
- SIL radar technology is suitable for developing sensitive, low-power wearable vital sign monitors.
- The developed bistatic SIL radar pulse monitor effectively acquires physiological data from the wrist.
- This approach offers a viable pathway for advanced, non-invasive health monitoring solutions.
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