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Remote nocturnal bird classification by spectroscopy in extended wavelength ranges

Lundin, Patrik LU ; Samuelsson, Per; Svanberg, Sune LU ; Runemark, Anna LU ; Åkesson, Susanne LU and Brydegaard, Mikkel LU (2011) In Applied Optics 50(20). p.3396-3411
Abstract
We present optical methods at a wide range of wavelengths for remote classification of birds. The proposed methods include eye-safe fluorescence and depolarization lidar techniques, passive scattering spectroscopy, and infrared (IR) spectroscopy. In this paper we refine our previously presented method of remotely classifying birds with the help of laser-induced beta-keratin fluorescence. Phenomena of excitation quenching are studied in the laboratory and are theoretically discussed in detail. It is shown how the ordered microstructures in bird feathers induce structural "colors" in the IR region with wavelengths of around 3-6 mu m. We show that transmittance in this region depends on the angle of incidence of the transmitted light in a... (More)
We present optical methods at a wide range of wavelengths for remote classification of birds. The proposed methods include eye-safe fluorescence and depolarization lidar techniques, passive scattering spectroscopy, and infrared (IR) spectroscopy. In this paper we refine our previously presented method of remotely classifying birds with the help of laser-induced beta-keratin fluorescence. Phenomena of excitation quenching are studied in the laboratory and are theoretically discussed in detail. It is shown how the ordered microstructures in bird feathers induce structural "colors" in the IR region with wavelengths of around 3-6 mu m. We show that transmittance in this region depends on the angle of incidence of the transmitted light in a species-specific way and that the transmittance exhibits a close correlation to the spatial periodicity in the arrangement of the feather barbules. We present a method by which the microstructure of feathers can be monitored in a remote fashion by utilization of thermal radiation and the wing beating of the bird. (C) 2011 Optical Society of America (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Optics
volume
50
issue
20
pages
3396 - 3411
publisher
OSA
external identifiers
  • wos:000293069000003
  • scopus:79960260217
ISSN
2155-3165
DOI
10.1364/AO.50.003396
project
CAnMove
language
English
LU publication?
yes
id
61a49efc-839c-41a1-88ca-f6319c0f85f2 (old id 2162234)
date added to LUP
2011-09-21 08:54:18
date last changed
2017-10-22 03:30:54
@article{61a49efc-839c-41a1-88ca-f6319c0f85f2,
  abstract     = {We present optical methods at a wide range of wavelengths for remote classification of birds. The proposed methods include eye-safe fluorescence and depolarization lidar techniques, passive scattering spectroscopy, and infrared (IR) spectroscopy. In this paper we refine our previously presented method of remotely classifying birds with the help of laser-induced beta-keratin fluorescence. Phenomena of excitation quenching are studied in the laboratory and are theoretically discussed in detail. It is shown how the ordered microstructures in bird feathers induce structural "colors" in the IR region with wavelengths of around 3-6 mu m. We show that transmittance in this region depends on the angle of incidence of the transmitted light in a species-specific way and that the transmittance exhibits a close correlation to the spatial periodicity in the arrangement of the feather barbules. We present a method by which the microstructure of feathers can be monitored in a remote fashion by utilization of thermal radiation and the wing beating of the bird. (C) 2011 Optical Society of America},
  author       = {Lundin, Patrik and Samuelsson, Per and Svanberg, Sune and Runemark, Anna and Åkesson, Susanne and Brydegaard, Mikkel},
  issn         = {2155-3165},
  language     = {eng},
  number       = {20},
  pages        = {3396--3411},
  publisher    = {OSA},
  series       = {Applied Optics},
  title        = {Remote nocturnal bird classification by spectroscopy in extended wavelength ranges},
  url          = {http://dx.doi.org/10.1364/AO.50.003396},
  volume       = {50},
  year         = {2011},
}