A Wireless and Passive Low-Pressure Sensor

A Wireless and Passive Low-Pressure Sensor

This paper will discuss the results obtained with a first prototype of a completely passive and wireless low pressure sensor. The device is a heat conductivity gauge, based on a wireless and passive SAW temperature sensor. The required heating energy is applied to the sensor using inductive coupling. The prototype was successfully tested in a vacuum chamber. Its equilibrium temperature changed ...

A Wireless and Passive Embeddable Low-Pressure Sensor

HYREP: A Hybrid Low-Power Protocol for Wireless Sensor Networks

In this paper, a new hybrid routing protocol is presented for low power Wireless Sensor Networks (WSNs). The new system uses an integrated piezoelectric energy harvester to increase the network lifetime. Power dissipation is one of the most important factors affecting lifetime of a WSN. An innovative cluster head selection technique using Cuckoo optimization algorithm has been used in the desig...

A CMOS Pressure Sensor Tag Chip for Passive Wireless Applications

This paper presents a novel monolithic pressure sensor tag for passive wireless applications. The proposed pressure sensor tag is based on an ultra-high frequency RFID system. The pressure sensor element is implemented in the 0.18 µm CMOS process and the membrane gap is formed by sacrificial layer release, resulting in a sensitivity of 1.2 fF/kPa within the range from 0 to 600 kPa. A three-stag...

Passive Wireless Magnetic Sensor

SAW-based magnetic sensors enable the remote interrogation of local magnetic fields. Designs utilizing a magnetostrictive delay line or a magnetic IDT have been proposed, showing a large sensing range with a rather low sensitivity. Another concept, employing a SAW device loaded with a GMI element, has been shown to provide higher sensitivity. However, the GMI element is a microwire structure, w...