In this paper, a novel piezoelectric sensor is presented for patient's breath monitoring applications. Breath rate monitoring is important especially for the new coronavirus patients. In this work, a piezoelectric sensor is designed in the form of a vertex-attached triangular beam made of Polyvinylidene fluoride (PVDF) and Polydimethylsiloxane (PDMS). It exploits chest displacement to distinguish breathing vibrations. The device shape and dimensions have been designed for low frequency operation. The output respiration signal is amplified using a low power charge amplifier circuit. The sensor can be placed in a vest and fastened as a belt, or be attached to the chest by a tape. A low pass filter is used to eliminate the noise from the environment and body movement. Among the most important features are high accuracy, low resonance frequency to distinguish chest movement, low weight, low cost, portability, and reliability. Simulation of the designed sensor using COMSOL shows output voltage of 1 V at breathing frequency of 0.2 Hz.

在本文中，提出了一种新颖的压电传感器，用于患者的呼吸监测应用。呼吸频率监测对新的冠状病毒患者尤其重要。在这项工作中，压电传感器被设计为由聚偏二氟乙烯（PVDF）和聚二甲基硅氧烷（PDMS）制成的附有顶点的三角梁。它利用胸部移位来区分呼吸振动。器件的形状和尺寸设计用于低频操作。使用低功率电荷放大器电路放大输出的呼吸信号。传感器可以放在背心上并系上皮带，也可以用胶带固定在胸前。低通滤波器用于消除环境和人体运动产生的噪音。最重要的功能是高精度 低共振频率以区分胸部运动，重量轻，成本低，便携性和可靠性。使用COMSOL对设计的传感器进行的仿真显示，呼吸频率为0.2 Hz时，输出电压为1V。