The TDLAS instrument.
Schematic diagram of the TDLAS composed of two main parts: the optical system (DFB diode laser and multipass Herriott cell) and the electronics (computer, telemetry interface, control electronics, and DAS).
Recorded vs fitted spectra for the TDLAS instrument at a range of pressures (points and lines, respectively).
Calibration run performed for the 13 February 2000 balloon flight. Also shown is the corresponding fit used in the least square fitting procedure used to analyze in-flight -spectra.
Example of typical methane -spectra taken at different altitudes during a balloon ascent. This example is from the 13 February flight. The rms noise level is estimated from an average of ten -spectra on a nonabsorbed portion of the spectrum. The size of the measured signal is derived from the third and fourth turning points (around points 127 and 152, respectively) of a -spectrum.
Time series of the pressure measured on board the TDLAS on the 13 February 2000 balloon flight. Also plotted is the derived balloon vertical velocity.
Comparison of the methane vertical profiles made by the TDLAS instrument during the THESEO 2000 campaign. Also plotted are the measurements made by the ALIAS, ARGUS, ACATS IV, LPMA, BONBON, MkIV, and LACE instruments.
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