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Wireless measurement systems will provide significant benefits to industrial applications, for production facilities as well as in mobile or R&D scenarios. However, in order to exploit the improvements by flexibility, scalability and easy reconfigurability brought by wireless sensor networks (WSN), industrial use cases often require a sustainable autonomous energy supply, while providing the reliability...
This letter presents a semi-passive wireless nitrogen dioxide gas sensor based on a time-coded ultra-wideband tag. The gas is sensed by means of oxygen-plasma-treated multiwall carbon nanotubes. The reader consists of a commercial ultra-wideband radar. The signal backscattered at the tag is modulated by a single-pole double-throw switch and contains information on the gas concentration. The tag is...
A kind of temperature measurement system for high voltage disconnecting switch was presented in this paper. The arm chip STM32F103RBT6 which has low power and high performance was adopted as CPU, and the circuit consisted of power supply circuit, temperature measurement circuit, wireless communication circuit and control circuit. This system has been applied in practice and has achieved a good result.
In previous work, we presented the development of a piezoelectric switch for applications in ultra-low power wireless sensor nodes for monitoring the health condition of chickens. Using Pb(Zr0.52, Ti0.48)O3 (PZT) thin films, we have developed "S"-shaped PZT cantilevers with proof masses. Since the resonant frequency of the PZT devices is around 24 Hz, we utilized superharmonic resonance...
This article builds a smart monitoring and control system for the household electric power usage. The system presents the complete picture of current usage and projected cost of home appliance in a graphical display. It uses wireless communication to monitor energy saving and safety use. This can provide the elder a safe and energy-saving environment and service for daily life. The system integrates...
The article is based on wireless frequency-hopping communication technology, high-voltage bus switch contacts and temperature monitoring, combined with the main electric connection, the location of the measured points, name and temperature values are displayed on a computer screen at the monitoring center. ECS in the introduction of the loop current value, calculated temperature rise, given the ambient...
Last year, we reported on a SPICE-based compact RF small-signal electromechanical model for electrostatically actuated MEMS capacitive shunt switches with movable membranes. We now report on the enhancement of the model to include electrothermal and thermomechanical effects so that the model is applicable under large-signal RF conditions. Specifically, a thermal subcircuit is added to account for...
The system was designed for sensor measurement and data transfer. A new architecture of a multisensor system for temperature measurement using wireless communications was used in the paper. There are used sensors with digital or analog outputs [1]. The control software of the system has been created. Different software were designed for wireless units. The integrated RF chip nRF9E5 was used as wireless...
Three applications in wireless networks where model-free stochastic learning is applicable, are discussed. The learning based optimization problems are formulated and simulation results are presented. Some open issues are also discussed.
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