Title :
New passive sensors
Author :
Pohl, Alfred ; Reindl, Leonhard
Author_Institution :
Appl. Electron. Lab., Tech. Univ. Wien, Austria
Abstract :
In this paper, a new principle for passive radio requestable sensors is introduced. The currently available passive sensors mostly use time division access to the radio channel for the remote readout in a different manner, the proposed sensors utilize frequency division access, achieved by nonlinearity of the passive sensor, consisting of a semiconductor device such as a diode and a passive impedance. The information is modulated due to the cross correlation effect. To evaluate the information, coherent demodulation is carried out
Keywords :
electric sensing devices; frequency division multiple access; radio applications; radiotelemetry; remote sensing; FDMA; coherent demodulation; cross correlation effect; frequency division access; nonlinearity; passive impedance; passive sensors; radio channel; radio requestable sensors; remote readout; semiconductor device; wireless interrogable sensors; Active circuits; Base stations; Frequency conversion; Laboratories; Power supplies; RF signals; Radio frequency; Radiofrequency identification; Sensor systems; Temperature sensors;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1999. IMTC/99. Proceedings of the 16th IEEE
Conference_Location :
Venice
Print_ISBN :
0-7803-5276-9
DOI :
10.1109/IMTC.1999.777055
