 |
| Titel |
A portable dual frequency comb spectrometer for atmospheric applications |
| VerfasserIn |
Kevin Cossel, Eleanor Waxman, Gar-Wing Truong, Fabrizio Giorgetta, William Swann, Gregory Rieker, Ian Coddington, Nathan Newbury |
| Konferenz |
EGU General Assembly 2016
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250130854
|
| Publikation (Nr.) |
 EGU/EGU2016-11173.pdf |
|
|
|
|
|
| Zusammenfassung |
| Dual frequency comb (DFC) spectroscopy is a new technique that combines broad spectral
bandwidth, high spectral resolution, rapid data acquisition, and high sensitivity. In addition,
unlike standard Fourier-transform spectroscopy, it has an almost ideal instrument lineshape
function, does not require recalibration, and has no moving parts. These features make DFC
spectroscopy well suited for accurate measurements of multiple species simultaneously.
Because the frequency comb lasers can be well collimated, such a system can be used for
long open-path measurements with path lengths ranging from hundreds of meters to several
kilometers. This length scale bridges the gap between point measurements and satellite-based
measurements and is ideal for providing information about local sources and quanitfying
emissions.
Here we show a fully portable DFC spectrometer operating over a wide spectral region in
the near-infrared (about 1.5-2.1 μm or 6670-4750 cm−1 sampled at 0.0067 cm−1) and across
several different open-air paths. The current spectrometer fits in about a 500 L volume and
has low power consumption. It provides simultaneous measurements of CO2, CH4, and water
isotopes with a time resolution of seconds to minutes. We will provide an introduction to dual
frequency comb spectroscopy and then discuss the design and performance of the system. |
|
|
|
|
|
|