Title :
A wireless telemetry system for strain measurement
Author :
Chuah, Y.T. ; Chan, P.K. ; Siek, L.
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Inst., Singapore
Abstract :
A new strain measurement using wireless telemetry technique in civil engineering applications is proposed. The technique makes use of a transponder together with a strain gauge. The transponder is powered by the inductive coupling method which eliminates the need for expensive cable runs in the concrete for conventional strain measurement. The measured strain data is digitized and sent back to the PC-controlled reader using frequency shift keying (FSK) at two discrete frequencies of 134.2 kHz and 123.2 kHz. A prototype was built using commercial micropower CMOS ICs to verify its functionality. Measurements from the prototype have achieved a 100 cm reading range without any trimming on the capacitors in the resonance circuit. The total current consumption of the complete wireless strain measurement system was merely of 100 μA for 1000 Ω resistance stain gauge
Keywords :
CMOS integrated circuits; civil engineering computing; frequency shift keying; microcomputer applications; radiotelemetry; strain gauges; strain measurement; 100 cm; 100 muA; 1000 ohm; 123.2 kHz; 134.2 kHz; FSK; PC-controlled reader; civil engineering applications; commercial micropower CMOS IC; frequency shift keying; inductive coupling method; measured strain data; resistance stain gauge; resonance circuit; strain gauge; total current consumption; transponder; wireless strain measurement system; wireless telemetry system; Capacitive sensors; Civil engineering; Concrete; Electrical resistance measurement; Frequency measurement; Frequency shift keying; Prototypes; Strain measurement; Telemetry; Transponders;
Conference_Titel :
Electrical and Computer Engineering, 2000 Canadian Conference on
Conference_Location :
Halifax, NS
Print_ISBN :
0-7803-5957-7
DOI :
10.1109/CCECE.2000.849619
