Fig. 1: Cardiorespiratory sound sensors and sensing mechanism. | Microsystems & Nanoengineering

Fig. 1: Cardiorespiratory sound sensors and sensing mechanism.

From: A two-stage amplified PZT sensor for monitoring lung and heart sounds in discharged pneumonia patients

Fig. 1

a Illustration of the placement of sensors on the human body for lung and heart sound monitoring. b Image of the prototype of the sound sensor. c Inside view of the prototype with a printed circuit board. d Structure of the accelerometer-based on an asymmetric gapped cantilever structure. H is the distance between the layer of the piezoelectric beam and the neutral plane. e Built-in charge amplifier circuit for amplification of the piezoelectric signal

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