Human Pulse Signal Acquisition System Based on PVDF Piezoelectric Film

Abstract

Nowadays, traditional Chinese medicine (TCM) is attracting more attention. As the most complete methods of pulse diagnosis, the method named ‘three regions nine subdivisions’ has come to the fore. It is important to collect accurate pulse signals in this way. Hence a pulse signal acquisition system is developed, which includes a pulse sensor based on PVDF (Polyvinylidene fluoride) piezoelectric film, charge amplifier, low-pass filter, voltage amplifier, voltage follower, and a software system based on LabVIEW for controlling the acquisition process and storing data. And PVDF piezoelectric film has suitable performance for this system which as a new kind of polymer piezoelectric material. Finally, the experiment results demonstrate that the system can extract effective pulse signals without heavy pressure, laying a solid foundation for the subsequent analysis on pulse signals.

Real-time heart rate estimation using PVDF flexible piezoelectric sensor based on machine learning

“…The frequency of the human pulse signal is typically between 0.2-45Hz, with most of the effective frequencies being relatively low and concentrated between 0.5-10Hz [14]. The pulse signal collected through the signal conditioning circuit is inputted to the 12-bit ADC of the STM32 for processing, with a signal acquisition frequency of 100Hz.…”

“…The raw pulse signal waveform in 20 seconds obtained is shown in Figure 4. During the process of pulse signal acquisition, various interferences are often encountered, such as 50Hz power frequency interference and high-frequency interference from the circuit and the human body [14]. In order to obtain a clearer and accurate pulse waveform, it is necessary to filter the raw signal.…”

Portable Pulse Meter with Simple Design

“…According to the working principle, (8) the pulse is measured by the sensor. When the infrared ray passes through red blood cells, there is no reflection signal under non-hyperemia conditions.…”

Self‐Powered Smart Shoes with Functional Ribbon Units for Monitoring Human Gait

“…[ 1–3 ] To overcome this limitation, research on the conversion of the kinetic energy of the human body into electrical energy and the utilization of harvested electrical energy has gained popularity. [ 4–8 ] Many energy harvesting mechanisms, such as triboelectric nanogenerators (TENGs), [ 9–11 ] piezoelectric generators (PEGs), [ 12–14 ] and thermoelectric generators (TEGs), [ 15–17 ] use human body motion to generate electric power; however, the generated electric power is too low to be directly stored in ordinary rechargeable batteries. For low‐power storage, capacitors are an alternative; however, they have fast discharging characteristics, which may restrict the usage of the stored electric power.…”

“…[1][2][3] To overcome this limitation, research on the conversion of the kinetic energy of the human body into electrical energy and the utilization of harvested electrical energy has gained popularity. [4][5][6][7][8] Many energy harvesting mechanisms, such as triboelectric nanogenerators (TENGs), [9][10][11] piezoelectric generators (PEGs), [12][13][14] and thermoelectric generators (TEGs), [15][16][17] use human body motion to generate electric power; however, the generated electric power is too low to be directly stored in ordinary rechargeable unit with flexible conductive electrodes for the tension-type sensors and energy harvesters installed in the novel self-powered smart shoes. By installing the ribbon units across the insole, dynamic foot pressure can be monitored, and electrical energy can be harvested during gait cycles.…”