Abstract: Most medical instruments invented to measure human heart activities, such as electrocardiograms (ECGs), rely on contact electrodes. This causes discomfort and limits application scenarios.

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Abstract: Micro-Doppler is the unique micro-motion feature of the target, which can be used as an important basis for helicopter target recognition. In this paper, the clutter component, fuselage ...

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A fetal doppler is a handheld ultrasound tool used to listen to a baby's heartbeat with reflected sound waves. Fetal heartbeats are usually detected by a doppler around 10 to 12 weeks of pregnancy.