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A versatile instrument with an optical parametric oscillator transmitter tunable from 1.5 to 3.1 μm for aerosol lidar and DIAL

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    Rights statement: From TRANSFER OF COPYRIGHT TO SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE)... Authors, or their employers in the case of works made for hire, retain the following rights: [...] 5. The right to post an author-prepared version or an official version (preferred version) of the published paper on an internal or external server controlled exclusively by the author/employer, provided that (a) such posting is noncommercial in nature and the paper is made available to users without charge; (b) a copyright notice and full citation appear with the paper, and (c) a link to SPIE’s official online version of the abstract is provided using the DOI (Document Object Identifier) link.

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Original languageEnglish
Pages88940L-2 to 88940L-9
Number of pages9
DOIs
Publication statusPublished - 22 Oct 2013
EventSPIE Remote Sensing 2013 - Internationale Congress Center, Dresden, United Kingdom
Duration: 23 Sep 201326 Sep 2013

Conference

ConferenceSPIE Remote Sensing 2013
CountryUnited Kingdom
CityDresden
Period23/09/1326/09/13

Abstract

Lidar is a valuable tool for atmospheric monitoring, allowing range-resolved profile measurements of a variety of quantities including aerosols, wind, pollutants and greenhouse gases. We report here the development of a versatile fielddeployable instrument for monitoring the lower troposphere. This region includes the effects of surface–atmosphere interactions and is an area where the resolution of satellite data is generally poor. Our instrument has been designed with the goal of making range-resolved measurements of greenhouse gases such as carbon dioxide, as well as probing the structure of the boundary layer. The key component is a tunable laser source based on an optical parametric oscillator covering the wavelength range 1.5–3.1 μm. This relatively eye-safe spectral region includes absorption lines of carbon dioxide and other greenhouse gases enabling the application of the differential absorption lidar (DIAL) technique, whilst also being suitable for aerosol lidar. We also report the use of an avalanche photodiode detector with high sensitivity and low noise. Field tests of the instrument were performed, recording continuous lidar signals over extended periods. The data were digitized at up to 8 signals per second. Scattering from aerosols and molecules was detected to a maximum range of 2 km, whilst scattering from cloud was recorded at up to 6 km. The data are plotted as time-versus-range images to show the dynamic state of the atmosphere evolving over time. These results demonstrate that the lidar achieves key requirements for both aerosol scatter and DIAL: tunability of the transmitter wavelength, sensitivity to molecular and aerosol scattering and robustness for field use.

    Research areas

  • lidar, DIAL, differential absorption, laser, OPO, avalanche photodiode, APD, HITRAN

Event

SPIE Remote Sensing 2013

23/09/1326/09/13

Dresden, United Kingdom

Event: Conference

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