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Vapor recognition with surface acoustic wave sensor arrays.

Proceedings of the 4th Annual East Asian Conference on Chemical Sensors, November 23-26, 1999, Hsinchu, Taiwan, 1999 Nov; :10-20
Arrays of polymer-coated surface-acoustic-wave (SAW) vapor sensors were first reported in the 1980's [1-2] and have been the subject of intensive research and development efforts over the past decade [3,4]. Our primary interest in SAW sensor arrays stems from the potential for incorporating them into miniaturized instrumentation for assessing human exposures to toxic organic vapors encountered in the workplace and in the general environment. Toward this end we have explored various fundamental aspects of sensor-array design and operation, developed and tested prototype instruments and sub-systems for personal exposure monitoring and exhaled breath monitoring, and we are currently assessing the performance of such instruments for field testing the permeation resistance of chemical protective clothing for emergency responders and for assessing indoor air quality where dozens of organic compounds can be encountered at low-part-per-billion exposure levels. Regardless of the specific application, a number of issues have arisen in the course of this research that might be considered generic to the development of SAW sensor arrays and associated instrumentation for organic vapor analysis. Among these are 1) designing the array for optimal selectivity through strategic coating selection; 2) assessing the limits of detection, recognition, and discrimination; 3) determining the minimum number of sensor required for a given analysis; 4) miniaturization; and 5) incorporating sample capture, preconcentration, and separation stages with the array to enhance analytical performance. In this presentation, we will highlight some of the work we have done to address these issues.
Vapors; Toxins; Toxic-vapors; Toxic-effects; Occupational-exposure; Emergency-response; Emergency-responders; Protective-clothing; Organic-compounds; Exposure-levels; Exposure-assessment; Air-quality; Air-quality-control; Air-quality-monitoring; Organic-vapors
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Proceedings of the 4th Annual East Asian Conference on Chemical Sensors, November 23-26, 1999, Hsinchu, Taiwan
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University of Michigan, Ann Arbor