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23 November 1999 Hardware architectures for chemical sensing electronics
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This paper reviews several levels of interface electronics for chemical sensing system based on physical sensors. Many physical sensor, because of their interaction and vulnerability to the environment, have been eliminated from inclusion in sensing systems that require high precision and accuracy. With sufficient modeling, array design, and signal processing, however, these physical sensor are essential for providing a barrier to false alarms that is inherently not available in other sensors. We present our discussion under the assumption that physical sensor provide a useful dimension to solving chemical sensing problems. The responsibility of the interface electronics is to improve signal-to-noise ratio for a wider range and resolution of concentration detection and to extract features that enhance the robustness of chemical discrimination. Examples are presented of circuits that perform both of these functions for arrays of chemiresistors; these examples, aggregation of similar sensor signals and rank extraction, are a small subset of possible techniques that can be used to enhance the performance of physical sensors.
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Denise M. Wilson and Thaddeus A. Roppel "Hardware architectures for chemical sensing electronics", Proc. SPIE 3856, Internal Standardization and Calibration Architectures for Chemical Sensors, (23 November 1999);

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