Results 211 to 220 of about 15,530 (235)

Wireless passive sensor networks

IEEE Communications Magazine, 2009
The primary challenge in wireless sensor network deployment is the limited network lifetime due to finite-capacity batteries. Hence, the vast majority of research efforts thus far have focused on the development of energy-efficient communication and computing mechanisms for WSNs.
O.B. Akan, M.T. Isik, B. Baykal
openaire   +1 more source

Designing a Passive Retrodirective Wireless Sensor

IEEE Antennas and Wireless Propagation Letters, 2017
This letter presents a wireless sensing approach implemented using a fully passive sensor element and a retrodirective antenna array. The utilized sensor is based on frequency modulation, and the proposed concept is investigated both theoretically and experimentally.
Islam, Md Mazidul, Rasilainen, Kimmo, Karki, Sabin Kumar, Viikari, Ville   +4 more
openaire   +1 more source

A Wireless Fully-Passive Acquisition of Biopotentials

Biosensors and Bioelectronics, 2019
Biopotential signals contain essential information for assessing functionality of organs and diagnosing diseases. We present a flexible sensor, capable of measuring biopotentials, in real time, in wireless and fully-passive manner. The flexible sensor collects and transmits biopotentials to an external reader without wire, battery, or harvesting ...
Shiyi, Liu, Xueling, Meng, Jianwei, Zhang, Junseok, Chae   +3 more
openaire   +3 more sources

Passive resonators for wireless passive sensor readout enhancement

Applied Physics Letters, 2013
A scheme to enhance a wireless passive sensor's readout is presented. This alternative consists of the addition of a passive inductive-capacitive resonator placed between the sensor and readout antenna. A discrete model is proposed and used in simulations to study the effects of the resonator in the sensor-antenna interaction.
Diego A. Sanz, Costantino Mitrosbaras, Edgar A. Unigarro, Fredy Segura-Quijano   +3 more
openaire   +1 more source

A wireless passive strain sensor

2011 IEEE SENSORS Proceedings, 2011
This paper introduces a wireless passive sensor concept for measurement of one- and two-dimensional strain and bending. An identification opportunity can easily be added to the sensor element to distinguish between different sensor “tags”. The concept is based on the modulation of the frequency domain backscatter signature of a radar target by the ...
Christian Mandel, Martin Schussler, Rolf Jakoby   +2 more
openaire   +1 more source

A wireless passive tension sensor

Proceedings of the 16th International Conference on Mechatronics - Mechatronika 2014, 2014
In this paper, a new type of tension sensor is designed according to the needs of measuring the tension of varieties of ropes such as ropes in parachute. The sensor is designed to have a T-shape structure, so that the rope can cross over the sensor without any damage during measurement.
Min Zhao, Xiao-han Tian, Ruo-yun Zhang, Lin-lin Wu   +3 more
openaire   +1 more source

Wireless passive hydrogen gas sensor

2012 25th IEEE Canadian Conference on Electrical and Computer Engineering (CCECE), 2012
This paper presents an implementation of a passive wireless hydrogen gas sensor tag operating in ISM band at 900 MHz. The antenna has been designed and fabricated to operate with a MOS hydrogen gas sensor. The preliminary results show a promising integration of MOS hydrogen sensor in wireless systems for future sensors network applications and hydrogen
O. Bekkaoui, I. Kerroum, F. Domingue, A. O. Dahmane   +3 more
openaire   +1 more source

Wireless passive IDT strain microsensor

Smart Materials and Structures, 1997
This paper presents the experimental results of wireless passive IDT strain microsensors, which consist of inter-digital transducers (IDTs) on piezoelectric wafers to transmit and receive surface acoustic waves. By connecting the IDTs to a small microwave antenna, the IDT microsensors are wirelessly readable by a microwave reading system.
Vasundara V Varadan, Vijay K Varadan, Xiaoqi Bao, Srinivasan Ramanathan, Daniel Piscotty   +4 more
openaire   +1 more source

Passive Wireless MEMS Microphones for Biomedical Applications

Journal of Biomechanical Engineering, 2005
This paper introduces passive wireless telemetry based operation for high frequency acoustic sensors. The focus is on the development, fabrication, and evaluation of wireless, batteryless SAW-IDT MEMS microphones for biomedical applications. Due to the absence of batteries, the developed sensors are small and as a result of the batch manufacturing ...
A S, Sezen, S, Sivaramakrishnan, S, Hur, R, Rajamani, W, Robbins, B J, Nelson   +5 more
openaire   +2 more sources

Wireless Measurement Electronics for Passive Temperature Sensor

IEEE Transactions on Instrumentation and Measurement, 2012
High-temperature measurement systems do not allow the use of traditional measurement techniques. In the presence of high temperatures, the proper functioning of electronics is compromised. Furthermore, if the measurement environment is also hermetic, the traditional cabled measurement technique cannot be adopted.
SARDINI, Emilio, SERPELLONI, MAURO
openaire   +2 more sources