Design of Wireless Readout System for Resonant Gas Sensors

Authors: S. Mohamed Rabeek, Mi Kyoung Park, M. Annamalai Arasu

Abstract:

This paper presents a design of a wireless read out system for tracking the frequency shift of the polymer coated piezoelectric micro electromechanical resonator due to gas absorption. The measure of this frequency shift indicates the percentage of a particular gas the sensor is exposed to. It is measured using an oscillator and an FPGA based frequency counter by employing the resonator as a frequency determining element in the oscillator. This system consists of a Gas Sensing Wireless Readout (GSWR) and an USB Wireless Transceiver (UWT). GSWR consists of an oscillator based on a trans-impedance sustaining amplifier, an FPGA based frequency readout, a sub 1GHz wireless transceiver and a micro controller. UWT can be plugged into the computer via USB port and function as a wireless module to transfer gas sensor data from GSWR to the computer through its USB port. GUI program running on the computer periodically polls for sensor data through UWT - GSWR wireless link, the response from GSWR is logged in a file for post processing as well as displayed on screen.

Keywords: Gas sensor, GSWR, micro-mechanical system, UWT, volatile emissions.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1111891

References:

[1] F. Röck, N. Barsan, U. Weimar, Electronic Nose: Current Status and Future Trends, Chemical Reviews 108 (2008) 705–725.
[2] E.J. Severin, B.J. Doleman, N.S. Lewis, An Investigation of the Concentration Dependence and Response to Analyte Mixtures of Carbon Black/Insulating Organic Polymer Composite Vapor Detectors, Analytical Chemistry 72 (2000) 658–668.
[3] N.S. Lewis, Comparisons between Mammalian and Artificial Olfaction Based on Arrays of Carbon Black–Polymer Composite Vapor Detectors, Accounts of Chemical Research 37 (2004) 663–672.
[4] Pettine, J., M. Patrascu, D. M. Karabacak, M. Vandecasteele, V. Petrescu, S. H. Brongersma, M. Crego-Calama, and C. Van Hoof. "Volatile Detection System Using Piezoelectric Micromechanical Resonators Interfaced by an Oscillator Readout." Sensors and Actuators A: Physical 189 (2013): 496-503.
[5] S. Mohamed Rabeek, M. Kumarasamy Raja, Steve Schiefen, Michael K. Dempsey, Ruey Feng Peh, and Minkyu Je, "Wireless Tag and Reader Module Design for Automated Hand Hygiene Documentation and Reminder System in Hospitals," International Journal of Information and Electronics Engineering vol. 3, no. 1, pp. 16-19, 2013.
[6] Patrascu, M., J. Pettine, D. M. Karabacak, M. Vandecasteele, S. H. Brongersma, and M. Crego-Calama. "Oscillator-Based Volatile Detection System Using Doubly-Clamped Micromechanical Resonators." Procedia Engineering 25 (2011): 1533-1536.
[7] “Low Power Mixed Signal Controller MSP430F550x Data Sheet,” Texas Instruments Inc. SLAS645B-JULY2009-REVISED JULY2010.
[8] “Low-Power Sub-1 GHz RF Transceiver CC1101 Data Sheet,” Texas instruments Inc. SWRS061F-January 2010.