Portable instrument for online investigations of optical properties of airborne particles
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Author (Corporation)
Publication date
2017
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Type
04B - Conference paper
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Parent work
16th International Conference on Automatic Fire Detection & Suppression, Detection and Signaling Research and Applications Conference
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DOI of the original publication
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Series
Series number
Volume
1
Issue / Number
Pages / Duration
9-16
Patent number
Publisher / Publishing institution
Place of publication / Event location
Hyattsville
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Abstract
For the development of photoelectric fire detectors the discrimination of smoke from nuisance aerosols is still one of the main goals. In order to improve our understanding of optical properties of airborne particles and to determine different quantities like morphology, efractive index or size distribution, a time resolved online measurement instrument is highly advantageous. The presented instrument measures fourteen scattering vectors at two wavelengths and two different polarization directions of the incident light. Main effort was put on achieving high stability and high dynamic range by carefully designing the optics and exploiting a wide measurement range of the detectors. As a result the dynamic range is improved by approximately a factor of three (compared to [1]). The time resolution has been increased by a factor of two although the number of measured polarization states has been doubled. A fast and field-capable calibration method was developed, enabling for a quick set-up in the field, while keeping the accuracy as close as possible to the laboratory conditions. Scattered light and particle size distribution measurements with Di-Ethyl-Hexyl-Sebacat (DEHS) aerosol were performed and compared to Mie scattering calculations in order to verify the calibration. As a next step a comprehensive data base of aerosol optical properties including polarization dependent scattering will be collected serving as a basis for designing novel fire detectors.
Keywords
Event
16th International Conference on Automatic Fire Detection AUBE'17 & 2017 Suppression, Detection, and Signaling Research and Applications Conference, SUPDET 2017
Exhibition start date
Exhibition end date
Conference start date
12.09.2017
Conference end date
14.09.2017
Date of the last check
ISBN
978-3-940402-11-0
ISSN
Language
English
Created during FHNW affiliation
Yes
Strategic action fields FHNW
Publication status
Published
Review
No peer review
Open access category
Closed
License
Citation
Robertz, J., Duric, A., Allemann, M., Egli, D., Loepfe, M., Burtscher, H., & Schöpe, H. J. (2017). Portable instrument for online investigations of optical properties of airborne particles. In A. Czylwik (Ed.), 16th International Conference on Automatic Fire Detection & Suppression, Detection and Signaling Research and Applications Conference (Vol. 1, pp. 9–16). https://irf.fhnw.ch/handle/11654/51540