© TDL Sensors Ltd 2012 Tunable Laser Gas Monitoring

© TDL Sensors Ltd 2012 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 Advantages of laser based gas analysers: Tunable Laser Gas Monitoring

© TDL Sensors Ltd 2012 Its a high-resolution spectroscopic measurement Tunable Laser Gas Monitoring

© TDL Sensors Ltd 2012 Tunable Laser Gas Monitoring Mid IRNear IR UV-VisVisible

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

© TDL Sensors Ltd 2012 Tunable Laser Gas Monitoring NIR Mid-IR Each gas absorbs light in a characteristic way. Hydrogen Fluoride (HF) Carbon Dioxide (CO2) Nitric Oxide (NO) Ammonia (NH3) Carbon Monoxide (CO) Methane (CH4) Water (H2O) This means that each gas has a unique spectrum or fingerprint.

© TDL Sensors Ltd 2012 Tunable Laser Gas Monitoring

© TDL Sensors Ltd 2012 Low resolution Tunable Laser Gas Monitoring

© TDL Sensors Ltd 2012 Low resolution Difficult to distinguish between the two species Tunable Laser Gas Monitoring

© TDL Sensors Ltd 2012 High resolution Tunable Laser Gas Monitoring

© TDL Sensors Ltd 2012 High resolution Tunable Laser Gas Monitoring

© TDL Sensors Ltd 2012 High resolution Individual absorption lines can be resolved free from interference Tunable Laser Gas Monitoring

© TDL Sensors Ltd 2012 High resolution Laser tunes over a narrow range Tunable Laser Gas Monitoring

© TDL Sensors Ltd 2012 Technology 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

© TDL Sensors Ltd 2012 Technology GasPerformance option RangeDetection limitMeasurement rate (Hz) CO Plus Standard 0 – 20 ppm 0 – 200ppm 2 ppb 0.1 ppm10 HCl Plus Standard 0 – 10 ppm 0 – 5 00 ppm 5 ppb 0.5 ppm10 HF Plus Standard 0 – 10 ppm 0 – 100 ppm 2 ppb 0.01 ppm10 NO Plus Standard 0-20 ppm ppm 5 ppb 1 ppm10 NH 3 Plus Standard 0 – 2 ppm 0 – 200 ppm 2 ppb 0.1 ppm10 NO 2 Plus Standard 0 – 2000 ppm – 1 ppm –10 SO 2 Plus Standard – 0 – 500 ppm – 1 ppm10 O2O2 Plus Standard 0 – 2 % 0 – 25 % 20 ppm 0.05 %10 CH 4 Plus Standard 0 – 2 ppm 0 – 1000 ppm 1 ppb 0.5 ppm10 N2ON2O Plus Standard 0 – 20 ppm – 2 ppb – 10 - H2SH2S Plus Standard 0 – 500 ppm – 1 ppm – 0.1 – HCN Plus Standard 0 – 10 ppm 0 – 100 ppm 5 ppb 0.1 ppm 1–1– CO 2 Plus Standard 0 – 2 ppm 0 – 1000 ppm 1 ppb 0.5 ppm10 Typical gases and specification

© TDL Sensors Ltd 2012 Technology Tunable laser control & data acquisition electronics Tunable laser & photodetector Mechanical design Software & firmware Signal processor Spectroscopy Core system components

© TDL Sensors Ltd 2012 Technology 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 Summary:

© TDL Sensors Ltd 2012 Technology Contact TDL Sensors Ltd The Incubator Building 48 Grafton Street Manchester M13 9XX United Kingdom Tel: +44 (0)