LEO-LEO Infrared Laser Occultation Technique to Measure Atmospheric Carbon Dioxide Concentration

Wendong Li; Jiqiao Liu; Yadan Zhu; Weibiao Chen

doi:10.3788/CJL201946.0810001

Chinese Journal of Lasers, Volume. 46, Issue 8, 0810001(2019)

LEO-LEO Infrared Laser Occultation Technique to Measure Atmospheric Carbon Dioxide Concentration

Wendong Li^1,2, Jiqiao Liu^1,2、*, Yadan Zhu^1,2, and Weibiao Chen^1,2

¹ Key Laboratory of Space Laser Communication and Detection Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

² Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

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Figures & Tables(9)

Fig. 1. Schematic of LIO geometric structure

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Fig. 2. RRE as a function of on-line wavenumber at altitudes of 5 km and 35 km

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Fig. 3. Absorption spectra of CO2 and H2O at altitude of 5 km

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Fig. 4. RSE caused by H2O as a function of altitude

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Fig. 5. Scanning characteristics of laser signals in occultation events. (a) Tangent point altitude as a function of time; (b) vertical scanning speed at different altitudes

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Fig. 6. RRE of CO2 concentration profile at different altitudes from 5 km to 35 km

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Fig. 7. Global distributions of occultation events. (a) One month; (b) one quarter; (c) one year

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Table 1. System simulation parameters

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Table 1. System simulation parameters

Instrument key parameter	Value
Transmitter
Pulse energy@2.09 μm /mJ	1.5
Pulse length τ /ms	1.5
Laser beam divergence θ /mrad	0.5
Receiver
Telescope diameter D /m	0.36
System optical efficiency η	0.40
Detector(PIN,G12183-203k)
Nominal gain M	1
Noise factor F	1
Responsivity@2.09 μm R /(A·W^-1)	1.1
Dark current I_d /nA	85
Amplifier bandwidth B /kHz	3

Table 2. LEO-LEO orbital parameters
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Table 2. LEO-LEO orbital parameters
Orbit parameter LEO(Tx) LEO(Rx)
Apogee altitude /km 500 650
Perigee altitude /km 500 650
Inclination /(°) 90 90
Argument of perigee /(°) 90 90
Right ascension ofascending node /(°) 180 0
Mean anomaly /(°) 270 270

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Wendong Li, Jiqiao Liu, Yadan Zhu, Weibiao Chen. LEO-LEO Infrared Laser Occultation Technique to Measure Atmospheric Carbon Dioxide Concentration[J]. Chinese Journal of Lasers, 2019, 46(8): 0810001

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