Key result
A wrist pulse rate monitor using a bistatic self-injection-locked radar architecture successfully monitored pulse rates by modulating the oscillator with the associated Doppler signal.
A novel wrist pulse rate monitor using self-injection-locked radar technology demonstrates potential for vital sign monitoring.
May enable contactless pulse monitoring in wearables; leaves open clinical validation and accuracy testing.
To achieve sensitivity, comfort, and durability in vital sign monitoring, this study explores the use of radar technologies in wearable devices. The study first detected the respiratory rates and heart rates of a subject at a one-meter distance using a self-injection-locked (SIL) radar and a conventional continuous-wave (CW) radar to compare the sensitivity versus power consumption between the two radars. Then, a pulse rate monitor was constructed based on a bistatic SIL radar architecture. This monitor uses an active antenna that is composed of a SIL oscillator (SILO) and a patch antenna. When attached to a band worn on the subject's wrist, the active antenna can monitor the pulse on the subject's wrist by modulating the SILO with the associated Doppler signal. Subsequently, the SILO's output signal is received and demodulated by a remote frequency discriminator to obtain the pulse rate information.
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Wang et al. (2016) studied this question. Self-injection-locked (SIL) radar technology vs. Conventional continuous-wave (CW) radar was evaluated on Sensitivity versus power consumption and pulse rate monitoring capability. A wrist pulse rate monitor using a bistatic self-injection-locked radar architecture successfully monitored pulse rates by modulating the oscillator with the associated Doppler signal.
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