However, piezoelectric materials for strain sensing applications have two drawbacks that limit their applications, primarily to pressure sensors. Therefore, piezoelectric materials are promising for strain sensing applications. The output voltage produced with strain can be used as a power source for additional functions such as wireless communication.

Unlike piezoresistive sensors, active sensing is possible with piezoelectric sensors. Piezoelectric-based sensors can accurately measure rapid strain changes without latency. The sensing mechanisms for stretchable sensors are piezoresistive 2, 3, 4, 5, 6, piezocapacitive 7, 8, 9, and piezoelectric 10, 11, 12, 13, 14, with the piezoelectric mechanism being the most advantageous. Therefore, it is essential to develop sensors with tunable sensing performance. Pulse sensing requires higher sensitivity than detection of bending motion. For example, a sensor attached to an elbow requires higher stretchability than that required for a finger.

Additionally, it is crucial to optimize sensor performance according to the target application because different sensor properties, such as stretchability and sensitivity, are required depending on the body part and application. Flexibility and stretchability are required for human body applications, and the demand for such sensors is increasing 1. Wearable sensors are becoming increasingly important in various applications such as health monitoring and artificial reality (AR)/virtual reality (VR) technology. Finally, the fabricated sensor was successfully applied in a haptic glove for playing musical instruments. A piezoelectric kirigami sensor was constructed with a sensitivity of 9.86 V/cm 2 and a stretchability of 320.8%, higher than those of previously reported kirigami piezoelectric strain sensors. A sensor voltage measurement circuit was also designed, amplifying the output voltage 86.5 times by improving measurement accuracy. The electromechanical properties of sensors with four different kirigami patterns were analyzed. Using finite element analysis, the sensing performance was evaluated, and the kirigami patterns were optimized. In this study, we developed a high performance kirigami piezoelectric strain sensor. Stretchability, sensitivity, and tunability are crucial sensor properties stretchability and sensitivity ensure user comfort and accurate sensing performance, while tunability is essential for implementing sensors in diverse applications with different ranges of motion.

The units can generally only monitor one or two lanes of traffic at a time.įor a more flexible, cost-effective system, which doesn't require road closure, ask us about video vehicle counting.Wearable technology requires high-performance sensors with properties such as small size, flexibility, and wireless communication. Data may be collected locally via an Ethernet or RS232 connection to a laptop, or over a mobile phone network.Ĭounting vehicles with piezoelectric sensors has the disadvantage that the road needs to be closed during installation. The counting device which is connected to the sensors is housed in an enclosure by the side of the road. This change in voltage can be used to detect and count vehicles. When the car moves off, the voltage reverses. The size of the signal is proportional to the degree of deformation. When a car drives over the piezoelectric sensor, it squeezes it and causes an electric potential - a voltage signal. When used to count vehicles, the sensor is mounted in a groove cut into road's surface. Piezoelectric sensors collect data by converting mechanical energy into electrical energy.

Piezo electric sensor