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Tunable Laser Gas Monitoring

Tunable Laser Gas Monitoring. Tunable Laser Gas Monitoring. Advantages of laser based gas analysers:. High sensitivity (ppb, ppm concentrations) Interference free gas measurements Large dynamic range Absolute measurements no drift, no calibration, inherently linear

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Tunable Laser Gas Monitoring

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  1. Tunable Laser Gas Monitoring

  2. Tunable Laser Gas Monitoring Advantages of laser based gas analysers: • High sensitivity (ppb, ppm concentrations) • Interference free gas measurements • Large dynamic range • Absolute measurements • no drift, no calibration, inherently linear • Real-time (10 Hz or faster response) • Very low maintenance

  3. Tunable Laser Gas Monitoring It’s a high-resolution spectroscopic measurement

  4. Tunable Laser Gas Monitoring UV-Vis Visible Near IR Mid IR

  5. Tunable Laser Gas Monitoring We use the IR spectral region for gas measurements 4.2->12 µm 3-5 µm 0.7-2.7 µm Tunable lasers available within this region DFGs QCLs Laser diodes, VCSELs

  6. Tunable Laser Gas Monitoring Mid-IR NIR Each gas absorbs light in a characteristic way. Hydrogen Fluoride (HF) Nitric Oxide (NO) Carbon Monoxide (CO) Carbon Dioxide (CO2) Ammonia (NH3) Methane (CH4) Water (H2O) This means that each gas has a unique spectrum or “fingerprint”.

  7. Gas in Gas out Measurement cell Photodetector Gas I Tunable laser I0 Signal out L Transmission Beer - Lambert Law: I0 I  Absorption coefficient Pathlength Transmission Laser frequency tuned Tunable Laser Gas Monitoring

  8. Tunable Laser Gas Monitoring Low resolution

  9. Tunable Laser Gas Monitoring Low resolution Difficult to distinguish between the two species

  10. Tunable Laser Gas Monitoring High resolution

  11. Tunable Laser Gas Monitoring High resolution

  12. Tunable Laser Gas Monitoring High resolution Individual absorption lines can be resolved free from interference

  13. Tunable Laser Gas Monitoring High resolution Laser tunes over a narrow range

  14. Real-time measurements Laser wavelength is tuned across absorption feature at >1 kHz and then averaged Concentration reported at rates as high as 10 Hz Technology

  15. Technology Typical gases and specification

  16. Technology Core system components Tunable laser control & data acquisition electronics Tunable laser & photodetector Spectroscopy Signal processor Software & firmware Mechanical design

  17. High sensitivity Interference free gas measurements Absolute measurements No drift, no calibration, inherently linear Real-time (1 s response) In-situ and non-invasive (optical technique) Very low maintenance Technology Summary:

  18. Technology Contact TDL Sensors LtdThe Incubator Building48 Grafton StreetManchester M13 9XXUnited KingdomTel: +44 (0)161 606 7289info@tdlsensors.co.uk www.tdlsensors.co.uk

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