FTIR Users Group Meeting FTIR development

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1 FTIR Users Group Meeting FTIR development

2 A bit of history From Oofty. To Spectronus

3 A bit of history Oofty, Univ. Of Wollongong, 1995 They developed a method of trace gas analysis based on 1-cm -1 resolution Fourier transform infrared (FT-IR) CO2, CH4, N2O, CO, 13 CO2 measurements The novel FT-IR method relies on the calculation of the absorbance spectra and a multivariate calibration algorithm. Precision Trace Gas Analysis by FT-IR Spectroscopy. 1. Simultaneous Analysis of CO 2, CH 4, N 2 O, and CO in Air; M. Esler et al The UOW FTIR trace gas analyser: comparison with loflo, agage and tank measurements at Cape Grim and gaslab, Griffith, D. W. T. et al., 2010 CSIRO baseline report A Fourier Transform Infrared trace gas analyser for atmospheric applications, Griffith, D. W. T. et al. AMT, 2012

4 A bit of history In 1995, Oofty had: Multipass cell of 9.8m optical path length Spectrometer of 1cm -1 resolution Liquid nitrogen cooled detector Mg(ClO 4 ) 2 dryer in order to minimize the water absorbance lines interference Human error removed by using automated program Calculation of the theoretical spectra based on HITRAN and the instrument properties. Classic least square fit of the calculated to measured spectra = concentration (C)

5 A bit of history From 1995 to 2009 Change of spectrometer from Bomem MB100 to Bruker Change the cell to a 24m optical path length Liquid nitrogen cooled detector changed to thermoelectrically-cooled Mercury Cadmium Telluride (MCT) Temperature and pressure sensor Mg(ClO 4 ) 2 cartridge from stainless steel to plastic Basic program to Visual Basic program (OSCAR) Classic least square fit of calculated to measured changed to non-linear least square

6 A bit of history In 2009 long term tests performed by S. Hammer (Univ. of Heidelberg) N 2 O dependence to CO 2 mixing ratio N 2 O dependence to H 2 O mixing ratio Improved fitting windows

7 A bit of history In 2009 long term tests performed by S. Hammer Long and short term stability Linearity

8 A bit of history In 2009 long term tests performed by S. Hammer Temperature dependence was also identified as a source of uncertainty when sampling in flow mode. This remains to be improved

9 A bit of history In 2009 long term tests allowed: improvements of the fitting windows implementation of the 2 mass flow controllers in order to control both the pressure and the sample flow in depth characterization of the instrument including cross sensitivities tests, long and short term stability understanding of what remain to be done!

10 Currently Since 2010 Ecotech took over the manufacturing Oofty is renamed Spectronus FTIR analyser OSCAR is replaced by the Spectronus software for more flexibility

11 Currently Since 2010 Spectronus Spectronus Spectrometer Valves, Pump, AI/DO T,P MALT OPUS more flexibility MALT analysis & data collection done in parallel refit OSCAR & V10 data

12 Currently Since 2010 Metal cell Optional metal cell for better temperature stability and less volume (1L less)

13 Currently Inside the manufacturing process Measurement cell & spectrometer bought from Bruker. Coupled in Ecotech

14 Currently Inside the manufacturing process Electronics, tubing and valves assembled in Ecotech Setup and testing of the Spectrometer s basic response (signal to noise, baseline, shape) Amplitude signal to noise Saturation under vacuum & ambient

15 Currently Inside the manufacturing process Testing includes: Leak test Cross sensitivities Allan variance (7 days) Calibration to certified tanks

16 What s next? 2016 for Spectronus software Working on a GUI with little understanding of the underlying task required List of variables accessible from the main GUI Allowing the number of loops in a list to be declared as a variable Synchronising to a time period this would allow the user to synchronise the beginning of a list (maybe just top level task list to a time period e.g. next minute, 10 minutes, hour, midnight etc for Spectronus FTIR working on temperature control for reliable static calibration (see presentation) New release, new paper, new ppt, new design new option Register and comment yourself

17 SpectronusUsers Meeting Thank you

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