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International Journal of Remote Sensing Volume 32, 2011 - Issue 21
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Original Articles

DIAL, a system for atmospheric methane measurement over Guwahati: development and results

Minakshi Devi Department of Physics, Gauhati University, Guwahati, Assam, 781014, IndiaCorrespondence[email protected]
,
Manoj Saikia Department of Physics, Gauhati University, Guwahati, Assam, 781014, India
&
Ananada Kumar Barbara Department of Physics, Gauhati University, Guwahati, Assam, 781014, India
Pages 6193-6204 | Received 12 Apr 2010, Accepted 01 Jul 2010, Published online: 28 Jul 2011
 
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Abstract

The article discusses the development and operational details of Differential Absorption LiDAR (DIAL) for the measurement of methane concentration in the semi-urban environment of Gauhati University. The system comprises two specifically selected wavelengths in 3 μm range: one is an absorbing wavelength (λon) and the other is non-absorbed (λoff) by methane molecules. Pulses of 10 ns for the two wavelengths are transmitted alternately for interleaved sampling of differential absorption. The pulse repetition rate is variable between 1 and 20 Hz. The slope and integrated target approaches are adopted to calculate the methane concentration, and observed figures are compared with globally reported values.

Acknowledgement

The authors duly acknowledge the financial support received from LASTEC, DRDO, New Delhi for developing the system.

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