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Proceedings Paper

Design of an integrated sensor system for the detection of traces of different molecules in the air
Author(s): D. Strle; I. Muševič
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Paper Abstract

This article presents the design of a miniature detection system and its associated signal processing electronics, which can detect and selectively recognize vapor traces of different materials in the air – including explosives. It is based on the array of surface-functionalized COMB capacitive sensors and extremely low noise, analog, integrated electronic circuit, hardwired digital signal processing hardware and additional software running on a PC. The instrument is sensitive and selective, consumes a minimum amount of energy, is very small (few mm3) and cheap to produce in large quantities, and is insensitive to mechanical influences. Using an electronic detection system built of low noise analog front-end and hard-wired digital signal processing, it is possible to detect less than 0.3ppt of TNT molecules in the atmosphere (3 TNT molecules in 1013 molecules of the air) at 25°C on a 1 Hz bandwidth using very small volume and approx. 10 mA current from a 5V supply voltage. The sensors are implemented in a modified MEMS process and analog electronics in 0.18 um CMOS technology.

Paper Details

Date Published: 3 April 2015
PDF: 8 pages
Proc. SPIE 9434, Nanosensors, Biosensors, and Info-Tech Sensors and Systems 2015, 943404 (3 April 2015); doi: 10.1117/12.2075333
Show Author Affiliations
D. Strle, Univ. of Ljubljana (Slovenia)
I. Muševič, Institute Josef Stefan (Slovenia)

Published in SPIE Proceedings Vol. 9434:
Nanosensors, Biosensors, and Info-Tech Sensors and Systems 2015
Vijay K. Varadan, Editor(s)

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