Ne. SSI - Enabled Sensor. Testing System (Se. TS) CPAC Meeting November 9, 2006 Cornelius H. Brons Mark Disko Andrew Riley Manuel Francisco
Objectives • Primary Objective Vapor phase detection of benzene of at low concentrations in the presence of toluene and xylenes (e. g. <1 ppm benzene, 100 ppm toluene) • Drivers Determining toxicological properties for trace exposures mixtures. Improve industrial hygiene monitoring for S/H/E • Detection Methods Testing portable sensors capable of sensing < 100 ppm benzene in nitrogen / hydrocarbon stream containing 100 X toluene or xylene Vapochromics Mid – IR Micro - Analytics Sensing Arrays • How Development of an automated Sensor Testing System ( Se. TS ) utilizing the Ne. SSI bus platform November 2006 CPAC Meeting – Seattle, WA
Sensor Testing System ( Se. TS ) Sampling 4 Ports November 2006 Gas Mixing CPAC Meeting – Seattle, WA
Se. TS: Ne. SSI-Enabled Gas Sampling H. P. N 2 Line ( 150 psi ) Static Gas Mixer (1/4” SS) To mix with BTX for dilution and flushing system Oxygen Sensor (GE) Moisture Analyzer (GE) ( measures dew/ frost points over a range of -110 to +60 C) (-166 to +140 F ) • 4 Rails ( Ne. SSI Stick ) Contain components to analyze gas mixtures • Mass Flow Controllers Control gas flows (0 -1 liter/min), (0 -100 sccm), ( 0 -10 sccm), (0 -2 sccm) • Temperature Probes • Sensor Ports • ppm – level mixture of gases vented in hood November 2006 CPAC Meeting – Seattle, WA
Gas Chromatograph With Se. TS Unit Inlet Gas Sample Lines From the Valco Set Up To G. C. Inlet Carrier Gas Lines To G. C. Hewlett Packard 5890 Gas Chromatograph Se. TS Unit • Gas Chromatograph has a Borosilica Packed Capillary Column • Helium, Hydrogen, Nitrogen and Air Gas Carriers With Samples • Automated Analysis With Lab View Software • G. C. Verifies Gas / Mixture Concentration Levels November 2006 CPAC Meeting – Seattle, WA
Se. TS Unit With Hollow Wave Guide Mid IR Sample Gas Lines To G. C. From Valco Se. TS Unit Gas (B, T, X) Manifold Ne. SSI Platform Mid Hollow Wave Guide IR Dr. Boris Miziakoff, Christina Young (Ga. Tech. ) November 2006 CPAC Meeting – Seattle, WA
Waveguide-Enhanced Mid-IR BTX with Se. TS Benzene with 200 ppm toluene, 10 – 30 ppm benzene, automated mixing Absorbance benzene @ 673 cm-1 toluene @ 690 cm-1 toluene @ 727 cm-1 10 ppm 15 ppm 20 ppm 25 ppm 30 ppm Wavelength (cm-1) • Absorbance spectrum show detection of volatile organic gases (benzene with toluene ) • Mid IR / active material ( Ag / Ag. I ) coated broad band hollow waveguide Christina Young & Boris Mizaikoff Ga. Tech November 2006 CPAC Meeting - Seattle, WA
Summary and Future Plans • Se. TS Unit Completed and Operational • Experimentation With BTX Started With Encouraging Results • Develop Enhanced Analytical Capabilities To Use With Ne. SSI In Place Micro Cantilevers Mid – IR Gas Chromatograph (GC) • What’s Next With Vapochromics. . Ocean Optics Probe to Analyze Compounds with BTX ( Dave Veltkamp) November 2006 CPAC Meeting – Seattle, WA
Vapochromic Probe Design & Sensing System GAS FLOW Vapochromic Film Probe Tip Dual Fiber Probe Excitation Fiber Light Source Blue LED Collection Fiber Spectrograph & Detector
Vapochromic Sensor Compounds with poorly packed lattice allow analyte to enter crystal lattice reversibly Compounds possess an intensely absorbing/ emitting UV-VIS-NIR chromophore that is solvatochromic Chromophore shifts reversibly when analyte enters the lattice cis-Pt(CN-p-(C 2 H 5)-C 6 H 4)2(CN)2 Pt. Pt distance changes when analyte enters crystal
Acknowledgements • Dr. Boris Mizaikoff / Christina Young ( G. I. T. ) (Mid – IR Hollow Wave Guide Data ) • Dr. David Veltkamp ( CPAC / University of Washington ) ( Vapochromics Set Up & Sensor Material )
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