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An Investigation Of Polymer Coated Surface Acoustic Wave Microsensor Arrays For The Determination Of Organic Solvent Vapors
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Book Synopsis An Investigation of Polymer-coated Surface Acoustic Wave Microsensor Arrays for the Determination of Organic Solvent Vapors by : Meng-Da Hsieh
Download or read book An Investigation of Polymer-coated Surface Acoustic Wave Microsensor Arrays for the Determination of Organic Solvent Vapors written by Meng-Da Hsieh and published by . This book was released on 2003 with total page 722 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Assessment of Subsurface VOCs Using a Chemical Microsensor Array. Final Report by :
Download or read book Assessment of Subsurface VOCs Using a Chemical Microsensor Array. Final Report written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the results of laboratory investigations of several performance parameters relevant to surface-acoustic-wave (SAW) chemical sensor arrays for the measurement of volatile organic compounds (VOCs) in contaminated soil and groundwater. The small size, low cost, sensitivity and selectivity of such instruments promise improvements in the quality and quantity of data used to guide site assessment and restoration efforts. In this investigation, calibrations were performed for 15 different coated SAW sensors. Each sensor was exposed to six VOCs selected to represent three chemical classes of contaminants that are commonly found at waste sites (i.e., aliphatic, aromatic and chlorinated hydrocarbons). A new pattern recognition method was developed for determining which coated sensors would maximize the selectivity and accuracy of quantitation for a given set of vapor contaminants. Using this method, an optimal subwet of four coated sensors was selected for testing in a prototype microsensor instrument. Additional laboratory experiments were performed with this optimized array to assess the limits of detection and linear response ranges for the representative vapors, as well as the additivity of responses to vapors in binary mixtures, temperature and humidity effects, aging effects, and other performance parameters related to the application of this technology to soil and groundwater VOC monitoring. Results demonstrate that SAW microsensor arrays can identify and quantify specific VOCs at concentrations in the [mu]g/L to mg/L range when present alone or in simple (e.g., binary) mixtures. SAW sensor technology offers a potentially effective alternative to existing field instrumentation for headspace analysis, soil vapor monitoring, and vacuum extraction process monitoring of VOCs in subsurface media.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2004 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Detection of Volatile Organics Using a Surface Acoustic Wave Array System by :
Download or read book Detection of Volatile Organics Using a Surface Acoustic Wave Array System written by and published by . This book was released on 1999 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: A chemical sensing system based on arrays of surface acoustic wave (SAW) delay lines has been developed for identification and quantification of volatile organic compounds (VOCs). The individual SAW chemical sensors consist of interdigital transducers patterned on the surface of an ST-cut quartz substrate to launch and detect the acoustic waves and a thin film coating in the SAW propagation path to perturb the acoustic wave velocity and attenuation during analyte sorption. A diverse set of material coatings gives the sensor arrays a degree of chemical sensitivity and selectivity. Materials examined for sensor application include the alkanethiol-based self-assembled monolayer, plasma-processed films, custom-synthesized conventional polymers, dendrimeric polymers, molecular recognition materials, electroplated metal thin films, and porous metal oxides. All of these materials target a specific chemical fi.mctionality and the enhancement of accessible film surface area. Since no one coating provides absolute analyte specificity, the array responses are further analyzed using a visual-empirical region-of-influence (VERI) pattern recognition algorithm. The chemical sensing system consists of a seven-element SAW array with accompanying drive and control electronics, sensor signal acquisition electronics, environmental vapor sampling hardware, and a notebook computer. Based on data gathered for individual sensor responses, greater than 93%-accurate identification can be achieved for any single analyte from a group of 17 VOCs and water.
Book Synopsis Surface-Launched Acoustic Wave Sensors by : Michael Thompson
Download or read book Surface-Launched Acoustic Wave Sensors written by Michael Thompson and published by Wiley-Interscience. This book was released on 1997-04-11 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book concerns the design, operation and application of devices capable of generating acoustic waves in the ultrasonic frequency range. It emphasizes the study of chemical and/or biochemical systems imposed on the surface of such devices, whether operated in the gas- or liquid-phase, i.e. on acoustic wave chemical and biological sensors. It focuses on devices that employ acoustic waves launched and received on the same surface. It touches upon such diverse areas as acoustic wave physics, applied mathematics, chemistry, electronics, fluid mechanics, materials science and polymer science.
Book Synopsis Surface acoustic wave detection of chemical warfare agents by : Dennis M. Davis
Download or read book Surface acoustic wave detection of chemical warfare agents written by Dennis M. Davis and published by . This book was released on 1988 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface Acoustic Wave (SAW) devices are potentially useful as small, sensitive chemical vapor sensors. The operating principles of these devices have been described in detail. The use of SAW devices for detecting dimethyl methylphosphonate (DMMP) vapor has been reported elsewhere. The basic operating principle of the SAW devices is the reversible adsorption of chemical vapors by adsorbent coatings that are sensitive and selective to the vapor that one is trying to detect. That is, SAW devices act as mass sensitive detectors. The SAW device used in this study consists of an array of four coated sensor elements with each coating giving a characteristic response to each of the vapors to be detected. The coatings used for the four sensors are fluoropolyol (FPOL), poly(ethylene maleate) (PEM), ethyl cellulose (ECEL), and polyvinyl pyrrolidone (PVP). Surface acoustic wave, Microsensors, Detection, Chemical warfare agents. (mjm).
Book Synopsis Acoustic Wave Sensors by : D. S. Ballantine Jr.
Download or read book Acoustic Wave Sensors written by D. S. Ballantine Jr. and published by Elsevier. This book was released on 1996-10-21 with total page 451 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by an interdisciplinary group of experts from both industry and academia, Acoustic Wave Sensors provides an in-depth look at the current state of acoustic wave devices and the scope of their use in chemical, biochemical, and physical measurements, as well as in engineering applications. Because of the inherent interdisciplinary applications of these devices, this book will be useful for the chemist and biochemist interested in the use and development ofthese sensors for specific applications; the electrical engineer involved in the design and improvement of these devices; the chemical engineer and the biotechnologist interested in using these devices for process monitoring and control; and the sensor community at large. Provides in-depth comparison and analyses of different types of acoustic wave devices Discusses operating principles and design considerations Includes table of relevant material constants for quick reference Presents an extensive review of current uses of these devices for chemical, biochemical, and physical measurements, and engineering applications
Book Synopsis The Measurement of Organic Vapors with Surface-acoustic-wave Microsensor Arrays by : Samuel John Patrash
Download or read book The Measurement of Organic Vapors with Surface-acoustic-wave Microsensor Arrays written by Samuel John Patrash and published by . This book was released on 1994 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Development of a Surface-acoustic-wave Microsensor Array for Measuring Organic Vapors in Breath and Ambient Air by : William Arthur Groves
Download or read book The Development of a Surface-acoustic-wave Microsensor Array for Measuring Organic Vapors in Breath and Ambient Air written by William Arthur Groves and published by . This book was released on 1997 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Surface Acoustic Wave Detection of Organophosphorus Compounds by : Dennis M. Davis
Download or read book Surface Acoustic Wave Detection of Organophosphorus Compounds written by Dennis M. Davis and published by . This book was released on 1988 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface Acoustic Wave (SAW) devices are potentially useful as small, sensitive chemical vapor sensors. The operating principles of these devices have been described in detail. Their use in detecting dimethyl methylphosphonate vapor has been reported previously. The basic operating principle for the SAW devices is the reversible adsorption of chemical vapors by adsorbent coatings that are sensitive and selective to the vapors that one is trying to detect. That is, SAW devices act as mass sensitive detectors. The SAW device used in this study consists of an array of four coated sensor elements with each coating giving a characteristic response to each of the vapors to be detected. Surface acoustic wave, Microsensors, Simulants, Detection. (mjm).
Book Synopsis Chemical and Biological Sensors and Analytical Electrochemical Methods by : Antonio Joseph Ricco
Download or read book Chemical and Biological Sensors and Analytical Electrochemical Methods written by Antonio Joseph Ricco and published by The Electrochemical Society. This book was released on 1997 with total page 1126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Relationship of Surface Acoustic Wave Vapor Sensor Responses to Thermodynamic Parameters for Gas Solubility: Polymer/Gas Partition Coefficients for Fluoropolyol by : Jay W. Grate
Download or read book Relationship of Surface Acoustic Wave Vapor Sensor Responses to Thermodynamic Parameters for Gas Solubility: Polymer/Gas Partition Coefficients for Fluoropolyol written by Jay W. Grate and published by . This book was released on 1987 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface acoustic wave (SAW) devices coated with a thin film of a stationary phase sense chemical vapors in the gas phase by detecting the mass of the vapor which distribute into the stationary phase. This distribution can be described by the partition coefficient, which gives the ratio of the concentration of the vapor in the stationary phase to the concentration of the vapor in the gas phase. An equation is presented which allows partition coefficients to be calculated from SAW vapor sensor frequency shifts. Partition coefficients for nine vapors into SAW coating fluoropolyol have been determined by this method, using both 112 MHz and 158 MHz SAW devices. Partition coefficients have also been determined independently by GLC and the results are is good agreement. The relationship between SAW frequency shifts and partition coefficients allows SAW sensor responses to be predicted if the partition coefficient has been measured by GLC, or if the partition coefficient can be estimated by various correlation methods being developed. Keywords: Surface acoustic wave, Microsensor, Vapor sensor, Fluoropolyol, Partition coefficient, Gas liquid chromatography.
Book Synopsis Surface Acoustic Wave Devices as Chemical Vapor Sensors by : Daniel Gallagher
Download or read book Surface Acoustic Wave Devices as Chemical Vapor Sensors written by Daniel Gallagher and published by . This book was released on 2009 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Acoustic Wave Sensors for Aroma Components Using Conducting Polymer Films by :
Download or read book Acoustic Wave Sensors for Aroma Components Using Conducting Polymer Films written by and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Microsensor Evaluation Studies by : L. Isaacson
Download or read book Microsensor Evaluation Studies written by L. Isaacson and published by . This book was released on 1989 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface Acoustic Wave (SAW) devices are potentially useful as small and very sensitive chemical vapor sensors. The basic operating principle for the SAW devices is the reversible adsorption of chemical vapors by adsorbent coatings which are sensitive and selective to the vapors one is trying to detect, that is, SAW devices act as mass sensitive detectors. The SAW device used in this study consists of an array of four coated sensor elements, with each coating providing a characteristic response to each of the vapors being detected. Results of experiments using fluoropolyol (FPOL), polyethylene maleate (PEM), polyvinyl pyrrolidone (PVP) and ethyl cellulose (ECEL) as the coatings, and dimethyl methylphosphonate (DMMP), diisopropyl methylphosphonate (DIMP), diethyl ethylphosphonate (DEEP), and dimethyl hydrogen phosphonate (DMHP), as the vapor challenges are reported. A major goal within the Chemical Research, Development and Engineering Center (CRDEC) has been the development of an increased capability to detect chemical agents. This report presents the results of examining the temporal responses of four SAW coatings to varying concentrations of four organophosphonates used as simulants. A report prepared by Microsensor Systems, Inc., Fairfax, VA, examined the effect of temperature, vapor flow rate, and aging on microsensor performance.
Book Synopsis Detection of organic solvent vapours with surface acoustic wave sensors using chemometric methods by : B. Boess
Download or read book Detection of organic solvent vapours with surface acoustic wave sensors using chemometric methods written by B. Boess and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Classical Least Squares Transformations of Sensor Array Pattern Vectors Into Vapor Descriptors by :
Download or read book Classical Least Squares Transformations of Sensor Array Pattern Vectors Into Vapor Descriptors written by and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
