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We propose a piezoelectric–piezoresistive coupling electric field sensor capable of performing large dynamic range AC electric field measurements. The electric field sensor utilizes direct coupling between piezoelectric (PE) materials and piezoresistive (PR) strain gauges, in conjunction with an external signal conditioning circuit, to measure AC electric fields effectively. We verified the feasibility of the scheme using a finite element simulation, fabricated a prototype of the electric field sensor, and characterized the properties of the prototype. The testing results indicate that the sensor exhibits an ac resolution of 50 V/m and a linear measurable electric field range of 0 to over 200 kV/m, which keeps the linearity at less than 0.94% from 1 Hz to over 5 kHz. Furthermore, the sensor also has advantages, such as a small size and low power consumption. The sensor can enhance the comprehensive observability and measurability of digital power grids. [ABSTRACT FROM AUTHOR]

Multi-functional magnetic sensors with tunable measure range can help cover different requirements from detecting weak field to sensing strong field. However, additional control system is often required to realize the tunability, which increases the complexity of device. In this work, we found the current controlled sensitivity and linear range in the NiCo2O4 thin film based anomalous hall sensor. The device owns not only simple structure but also interesting anomalous hall signal whose linearity range and sensitivity can be controlled by current. Ultrahigh sensitivity of 4900 V/(AT) in the range of ±0.2 mT and competitive sensitivity of 20 V/(AT) in the range of ±23 mT are simultaneously realized by tunning the work current. In addition, a memory switching characteristic controlled by magnetic field is further found in the device. These results show that the anomalous hall device has the potential for multifunctional compact device. [ABSTRACT FROM AUTHOR]