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| Titel |
Development of a Bioaerosol single particle detector (BIO IN) for the Fast Ice Nucleus CHamber FINCH |
| VerfasserIn |
U. Bundke, B. Reimann, B. Nillius, R. Jaenicke, H. Bingemer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 3, no. 1 ; Nr. 3, no. 1 (2010-02-23), S.263-271 |
| Datensatznummer |
250000827
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| Publikation (Nr.) |
 copernicus.org/amt-3-263-2010.pdf |
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| Zusammenfassung |
In this work we present the setup and first tests of our new BIO IN
detector. This detector was constructed to classify atmospheric ice nuclei
(IN) for their biological content. It is designed to be coupled to the Fast
Ice Nucleus CHamber FINCH. If one particle acts as an ice nucleus, it will be
at least partly covered with ice at the end of the development section of
the FINCH chamber. The device combines an auto-fluorescence detector and a
circular depolarization detector for simultaneous detection of biological
material and discrimination between water droplets, ice crystals and non
activated large aerosol particles. The excitation of biological material
with UV light and analysis of auto-fluorescence is a common principle used
for flow cytometry, fluorescence microscopy, spectroscopy and imaging. The
detection of auto-fluorescence of airborne single particles demands some
more experimental effort. However, expensive commercial sensors are
available for special purposes, e.g. size distribution measurements. But
these sensors will not fit the specifications needed for the FINCH IN
counter (e.g. high sample flow of up 10 LPM).
The newly developed -low cost- BIO IN sensor uses a single high-power UV LED
for the electronic excitation instead of much more expensive UV lasers. Other key advantages of the new sensor are the low weight, compact
size, and the little effect on the aerosol sample, which allows it to be
coupled with other instruments for further analysis.
The instrument will be flown on one of the first missions of the new German
research aircraft "HALO" (High Altitude and LOng range). |
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