Irsens
- 1. RTD Project IRSENS Integrated sensing platform for gases and liquids in the near and mid-infrared range Y. Bonetti, J. Faist ETH Zurich Plenary meeting – Bern – May 12, 2011 IrSens
- 2. Project Synopsis: Needs gas fluid Medicine (Diagnosis, Monitoring) Sensing of small molecules (CO, Environment (Pollution, Modelling) CO2, NxOy, ...) Sensitive Portable, Selective Low Power Infrared Spectroscopy Semiconductor System IrSens
- 3. Approach: optical sensing Laser detector N O IrSens
- 4. holistic approach Gas QCL, QCD, Electronics VCSEL SiGe CMOS Liquid Yes/No % IrSens
- 5. Pilot/focus applications Gas: CO2 isotope ratios, e.g for plant respiration monitoring – environment Liquid: Cocaine in saliva detection (presence yes/no) – traffic security Platform: develop tools and techniques Collaboration with industry started IrSens
- 6. Measurements in Gases IrSens
- 7. Schematic of the VCSEL gas- sensing demonstrator (TDLS) Collaboration with an industry in collaboration with IR Microsystems / Leister IrSens
- 8. Cylindrical Multipath Gas Cell 20*20*5 cm3 IrSens
- 9. Benchmarking Instrumentation benchmarked with different techniques: - Direct Absorption (DA) - Wavelength Modulation (WM) - Prototype cell - PhotoAcoustics (PA) - wrong QC laser! Technique DA WM PA Picarro (CRDS (NanoTera) (NanoTera) (NanoTera) reference) 1s precision (‰) 0.47 0.75 58.8 0.67 best precision (‰) 0.06 (200s) 0.05 (3000s) 0.65 (8000s) 0.1 (300s) see poster! IrSens
- 10. Also software!! full hardware control data acquisition and processing: - real-time fitting module based - on Hitran database measurement automation IrSens
- 11. Measurements in Liquids IrSens
- 12. Benchmarking with ATR- Spectroscopy best spectral range for Cocaine in H2O around 1730/cm → sources and detector design IrSens
- 13. QCL 1721 cm-1 measurements ● Strong increase in signal during drying, as expected ● Limit of detection around 20 µg/ml see poster! IrSens
- 14. Microfluidic Cell Source Detector Waveguide Inlets and Mixer Outlet IrSens
- 15. Transmission through waveguide at 6µm see poster! Waveguide QCL ZnSe lens Detector total transmission through 9mm*5µm waveguide: 4 % IMT Institut de microtechnique IrSens
- 16. Microfluidic Sample Preparation for IR-Detection see poster! Problem µ-flu. requirements Answer low-cost materials and rapid prototyping of disposable chips fabrication process UV-glue transfer to IR-transparent mid-IR absorption of water liquid-liquid extraction solvent IR-transp. organic solvents chemical compatibility of compatibility tests used for extraction chip to solvents aqueous and organic solvents handling of multiphase adjusting wetting on chip flows behavior of UV-glue materials with high absorption of analytes absorption tests recovery rate improvement of liquid- droplet generation & fast sample preparation liquid extraction separation IMT Institut de microtechnique IrSens
- 17. Microfluidic Sample Preparation for IR-Detection fluid mixing parameters need good control IMT Institut de microtechnique IrSens
- 18. Support workpackages: Sources: Vertical cavity surface emitting lasers (EPFL) Quantum Cascade Lasers (ETHZ) Detectors: Quantum Cascade detectors (UNINE) Ge/Si SPADs (EPFL) IrSens
- 19. Low dissipation, cw QC lasers 2311cm-1 1730cm-1 1.2W see poster! IrSens
- 20. Detectors: Quantum cascade detectors, SiGe CMOS SPAD IrSens
- 21. Ge on Si diode test I-V data low voltage data for diodes with Breakdown near -40V sizes of 1x1, 1x20, and 40x40 (criterion of 1 µA) micrometer good material for a detector @ 1.55µm IrSens
- 22. Quantum cascade detector Detectivity 5*108 jones (175K, 2300/cm) and 1.5*107 jones (250K, 1700/cm) Cold aperture, NTC, black inner side IrSens
- 23. Custom-made QCD preamplifier 1kHz 1MHz Footprint 4 x 4 cm2 • Observed 58 dB of gain in 100mV/nA configuration • Roughly 25 times more gain than with commercial solution (PA- 9-70 from Judson) • Almost identically low noise as commercial solution IrSens
- 24. Achievements Near-IR gas system (VCSEL): – Industrialization in progress Readiness Novelty Mid-IR gas – Already reached state of the art Mid-IR liquid – Key building blocks are validated – New detectors & lasers IrSens
- 25. IrSens team ETH UNINE K.Hans, M. Sigrist D. Hofstetter Y. Bonetti, M. Beck, R. Terazzi, J. DiFrancesco EPFL FHNWS E. Kapon, A. Sirbu H. Looser E. Charbon, M.Aminian A.Homsy, N. DeRooij, EMPA L. Hvozdara, Y-C.Chang, H.P Herzig B. Tuzson, A. Manninen, L. Emmenegger IrSens