Post on 05-Feb-2021
Team:
CNRS-Technical Departement, Meudon: N. Amarouche (CNRS), J-Ch. Samake (CNRS), J. Frerot (CNRS)
GSMA, UMR CNRS 7331, Reims, G. Durry (Pr),E. Rivière (MCF), M. Ghysels (now at NIST-Washington), L. Joly
(CNRS), J. Cousin, Z. Miftah el Rhair (CNES-PhD)
In situ measurement of H2O, CO2, CH4 with the PicoSDLAlaser spectrometers during STRATEOLE 2.
DFB - InGaAsP :
1 m < laser < 1.8 mH2O , CH4 , CO2 GaInAsSb / GaAlAsSb :
2 m < laser < 2.75 m
SOURCES LASER:
DETECTEURS: InGaAS and InAs photodiodes …
NEW !
RT- QCL lasers !!proche infrarouge
H2O , CO2 isotopesH2O isotopes, N2O
moyen infrarouge
NEW !
Quantum Cascade Laser
E1
E2hLaser
L
Fo Fo -F
Laser Détecteur
Patmos Tatmos
NCH4
Principes
12 EEhchch LaserLaser
Laser
4,, CHatmosatmosatmoso
mol NLPTTkFF
Beer – Lambert law, weak molecular absorption F/Fo < 1% :
PARAMETRES MOLECULAIRES
Laser (TLaser, ILaser) = mol
TLaser
ILaser
Peltier Fo F1Laser
Laser
CH4, 40 Torr, 8cm, ~ 1.65 m
Fo
F1
6248 cm-16233 cm-115 cm-1
CO2 : (3001)III --- > (0000) at 1.602 m
0 0.5 1 1.5 2 2.54
-0.05
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
R(6) R(30)
L = 10 m PCO2 = 13.3 mbar
R(16)
G. Durry & al. , Spectrochimica Acta A, Vol. 60, p3371, 2004.
SDLA, Sweden,THESEO-1999:
H2O at 1.39 micron
+ CH4
at 1.65 micron+
CO2at 1.60 micron
Micro-SDLA, Brazil,HIBISCUS-2004
Former balloonborne TDL sensors: SDLA, micro-SDLA
~10-4
~10-5~10-4
High selectivity, high signal-to-noise ratios, short measurement times.
CH4
OHOHmol NLk 22 Principle:
H2O Dynamical range of the
measurements !!!
InGaAsSb
Diodes laser à antimoniures: 2-3 micron
Stratospheric H2O, CO2, CH4, mission to Mars …
= 2.6 m
= 1.39 m
NEW
~ 800 g
PicoSDLA
Laser hygrometer
operated from weather
balloons
- Trends in stratospheric
H2O
- Satellite validation
- H2O in the TTL
G. Durry, N. Amarouche & al., Applied Physics B 90, 573–580 (2008).
H2O at 2.6 micron
CO2 at 2.68 micron
CH4 at 3.24 micron
A new generation of laser gas sensors : PicoSDLA
13
Operated as piggy-back …
CO2CH4
Canada, Timmins, August 2014, …
Bauru (22°S)Brazil (2013)
… launchedfrom smallballoons(500 m3)
16
Recovery by means of a GPS + mobil –phone.
CH4
Canada, Timmins, August 2014, …
CO2Z = 19.2 kmP = 65.01 hPaT = -57.9 °C
20 x 10 ms
Laser = 3.24 m
Laser = 2.68 m
CH4
Canada, Timmins, August 2014, …
PicoSDLA-CH4Canada2014
CO2Canada, Timmins, August 2014, …
Comparisons with Aircoreinstruments (LMD, …) underway …
Canada, Timmins, August 2014, …
Z ≈ 18,6 km
CO2
Test-flight, Strateole - configuration
~ 4 hours
Réalisation au GSMA « AMULSE I & II »
Poids 300 g
Cellule bi‐gaz (CO2/CH4)
Absorption directe
WMS* = sensibilité x 20
WMS* : Wavelenght Modulation Spectroscopy
AMULSE : AmosphericMeasurements Ultra Light SpEctrometer
Campagne de mesure à Lannemezan – Météo France ‐
CO2CO2+CH4
1650 g1990 g
CH4
CO2