Sensing Mechanisms of Flexible Pressure Sensors

Abstract

In the first segment of this project, the merits of the flexible capacitive pressure sensor will be described. These benefits encompass lower power consumption, less signal drift, greater response repeatability, and others. However, as ductile materials are incompressible, the device's sensitivity won't be very good without adopting structures. The purpose and advantages of the resistance flexible pressure sensor will then be discussed, as well as its high nonlinearity and the metal-based strain effect of the resistance strain gauge, which results in mechanical deformation when an external force is applied and results in a corresponding change in resistance value. However, the output signal is weak because of the environment and time zone variations. The design and operation of the sensor will change. It is not appropriate for long-term monitoring due to its significant time and temperature drift and the potential that correct data may not be acquired after extended measurement. Additionally, it is sensitive to electromagnetic fields, vibration, radiation, air pressure, sound pressure, and air velocity. In the last part, the benefits of the flexible piezoelectric pressure sensor will be discussed, including its broad frequency range, high sensitivity, high signal-to-noise ratio, simple structure, dependable operation, and light weight. The disadvantage of piezoelectric sensors is that some of these materials have poor output direct current responsiveness and call for moisture protection, which calls for the usage of charge amplifiers or high input impedance circuits to address this shortcoming.