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Proceedings Paper

Sun spectrometer for route determination of methane from helicopter
Author(s): Anatolyi A. Liberman
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Paper Abstract

12 The difficulty of a atmosphere mix monitoring problem from flying apparatus consists in a small level of scattered light from an earthly surface. With increase of height of flight the level of light exposure of the photoreceiver device decreases under the square-law. In particular it is essential for spectral monitoring in the IR range, where there are no high-sensitivity photoreceivers. Just it creates restrictions for lidars application at impurity gases monitoring in atmosphere. Such restriction is not present at solar spectrometers, as with increase of height of flight is increased and area of an observable earthly surface. In the report it's brought the description of solar spectrometer for research of methane in a near-earth layer of atmosphere. The entrance part of the device consists from interference light filter, scanned Fabry-Perot interferometer and focusing lens. The research carry out on 1666 nm wavelength. As the photoreceiver is used cooled the germanium photo diode. In spite of the fact that the device works on group rather poorly absorbing transitions of methane, as against transitions close 3300 - 3400 nm, the higher sensitivity is provided at the expense of application of the more sensitive photoreceiver. Thus, the sensitivity of the device reaches 16 ppm*m, that allows to determine methane concentration at a level 0.1 ppm.

Paper Details

Date Published: 14 February 2001
PDF: 7 pages
Proc. SPIE 4199, Water, Ground, and Air Pollution Monitoring and Remediation, (14 February 2001); doi: 10.1117/12.417370
Show Author Affiliations
Anatolyi A. Liberman, All-Russian State Institute for Optical and Physical Measurements (Russia)


Published in SPIE Proceedings Vol. 4199:
Water, Ground, and Air Pollution Monitoring and Remediation
Tuan Vo-Dinh; Robert L. Spellicy, Editor(s)

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