Development of a Microfabricated Vapor Preconcentrator for Portable Ion Mobility Spectroscopy

Martin, Michael; Crain, Mark M.; Walsh, Kevin M.; McGill, R. Andrew; Houser, Eric J.; Mott, D. B.; Stepnowski, J.V.; Stepnowski, S.; Nguyen, Vy; Wu, Houya; Ross, S.; Nagel, D. J.; Voiculescu, Ioana

doi:10.31438/trf.hh2004.103

Cited by 4 publications

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Performance of stacked, flow-through micropreconcentrators for portable trace detection

Martin

Roussel

Cambron

et al. 2010

Int. J. Ion Mobil. Spec.

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Improving techniques for portable trace analyte collection and pretreatment is of critical concern for security, medical, food and environmental applications. The trend has been to employ MEMS technologies to meet this need as these microfabricated devices offer advantages such as small dead volumes, low power consumption, capacity for large scale manufacture and a commensurate savings with economies of scale. In this work a prototype trace sampling system intended for use with ion mobility spectrometers is presented. The system utilizes a stack of microfabricated preconcentrator plates capable of collecting samples in a sorbent polymer at flow rates up to 30 LPM. The plates are thermally desorbed after an integration period to produce a concentrated vapor plug that is transferred to the detector for analysis. A real-time controller, FPGA and custom electronics are used to manage independent heating of up to 4 of these devices in either constant voltage or temperature modes. The preconcentrators were tested with a commercial Vapor Tracer II IMS against TNT and RDX vapors ranging in concentration from 2.6 PPT to 620 PPT under a variety of conditions. Results are presented on performance of single preconcentrators with RDX, multiple cascaded devices vs. TNT and RDX, with and without a PDMS detector inlet membrane, and to compare sorbent coated and bare devices. The system demonstrated preconcentration factors of 38 with 2.6 PPT RDX and 30 with 13 PPT TNT.

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Performance of stacked, flow-through micropreconcentrators for portable trace detection

Martin

Roussel

Cambron

et al. 2010

Int. J. Ion Mobil. Spec.

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Microfabricated chemical preconcentrators for gas-phase microanalytical detection systems

Voiculescu

Zaghloul

Narasimhan

2008

TrAC Trends in Analytical Chemistry

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Explosives Vapors–Concentrating and Optoelectronic Detection

Wojtas¹,

Rutecka²,

Popiel³

et al. 2014

Metrology and Measurement Systems

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Detection of explosives vapors is an extremely difficult task. The sensitivity of currently constructed detectors is often insufficient. The paper presents a description of an explosive vapors concentrator that improves the detection limit of some explosives detectors. These detectors have been developed at the Institute of Optoelectronics. The concentrator is especially dedicated to operate with nitrogen oxide detectors. Preliminary measurements show that using the concentrator, the recorded amount of nitrogen dioxide released from a 0.5 ng sample of TNT increases by a factor of approx. 20. In the concentrator an induction heater is applied. Thanks to this and because of the miniaturization of the container with an adsorbing material (approx. 1 cm 3 ), an extremely high rate of temperature growth is achieved (up to 500 °C within approx. 25 s). The concentration process is controlled by a microcontroller. Compact construction and battery power supply provide a possibility of using the concentrator as a portable device.

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Development of a Microfabricated Vapor Preconcentrator for Portable Ion Mobility Spectroscopy

Cited by 4 publications

References 0 publications

Performance of stacked, flow-through micropreconcentrators for portable trace detection

Performance of stacked, flow-through micropreconcentrators for portable trace detection

Microfabricated chemical preconcentrators for gas-phase microanalytical detection systems

Explosives Vapors–Concentrating and Optoelectronic Detection

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