Dual-Band Infrared Scheimpflug Lidar Reveals Insect Activity in a Tropical Cloud Forest
(2023) In Applied Spectroscopy 77(6). p.593-602- Abstract
- We describe an entomological dual-band 808 and 980 nm lidar system which has been implemented in a tropical cloud forest (Ecuador). The system was successfully tested at a sample rate of 5 kHz in a cloud forest during challenging foggy conditions (extinction coefficients up to 20 km–1). At times, the backscattered signal could be retrieved from a distance of 2.929 km. We present insect and bat observations up to 200 m during a single night with an emphasis on fog aspects, potentials, and benefits of such dual-band systems. We demonstrate that the modulation contrast between insects and fog is high in the frequency domain compared to intensity in the time domain, thus allowing for better identification and quantification in misty forests.... (More)
- We describe an entomological dual-band 808 and 980 nm lidar system which has been implemented in a tropical cloud forest (Ecuador). The system was successfully tested at a sample rate of 5 kHz in a cloud forest during challenging foggy conditions (extinction coefficients up to 20 km–1). At times, the backscattered signal could be retrieved from a distance of 2.929 km. We present insect and bat observations up to 200 m during a single night with an emphasis on fog aspects, potentials, and benefits of such dual-band systems. We demonstrate that the modulation contrast between insects and fog is high in the frequency domain compared to intensity in the time domain, thus allowing for better identification and quantification in misty forests. Oscillatory lidar extinction effects are shown in this work for the first time, caused by the combination of dense fog and large moths partially obstructing the beam. We demonstrate here an interesting case of a moth where left- and right-wing movements induced oscillations in both intensity and pixel spread. In addition, we were able to identify the dorsal and ventral sides of the wings by estimating the corresponding melanization with the dual-band lidar. We demonstrate that the wing beat trajectories in the dual-band parameter space are complementary rather than covarying or redundant, thus a dual-band entomological lidar approach to biodiversity studies is feasible in situ and endows species specificity differentiation. Future improvements are discussed. The introduction of these methodologies opens the door to a wealth of possible experiments to monitor, understand, and safeguard the biological resources of one of the most biodiverse countries on Earth. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/f0c072e3-df2a-41d5-a7b3-03e0b7633899
- author
- Santos, Victor ; Costa-Vera, Cesar ; Rivera-Parra, Pamela ; Burneo, Santiago ; Molina, Juan ; Encalada, Diana ; Salvador, Jacobo LU and Brydegaard, Mikkel LU
- organization
- publishing date
- 2023
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Scheimpflug lidar, entomological sensor, dual-band ranger, insect activity, foggy conditions, frequency domain
- in
- Applied Spectroscopy
- volume
- 77
- issue
- 6
- pages
- 593 - 602
- publisher
- Society for Applied Spectroscopy
- external identifiers
-
- scopus:85153595411
- pmid:37072925
- ISSN
- 1943-3530
- DOI
- 10.1177/00037028231169302
- project
- Coherent Back-Lasing from Atmospheric Insects
- language
- English
- LU publication?
- yes
- id
- f0c072e3-df2a-41d5-a7b3-03e0b7633899
- date added to LUP
- 2023-05-05 10:36:03
- date last changed
- 2023-11-08 05:39:07
@article{f0c072e3-df2a-41d5-a7b3-03e0b7633899,
abstract = {{We describe an entomological dual-band 808 and 980 nm lidar system which has been implemented in a tropical cloud forest (Ecuador). The system was successfully tested at a sample rate of 5 kHz in a cloud forest during challenging foggy conditions (extinction coefficients up to 20 km–1). At times, the backscattered signal could be retrieved from a distance of 2.929 km. We present insect and bat observations up to 200 m during a single night with an emphasis on fog aspects, potentials, and benefits of such dual-band systems. We demonstrate that the modulation contrast between insects and fog is high in the frequency domain compared to intensity in the time domain, thus allowing for better identification and quantification in misty forests. Oscillatory lidar extinction effects are shown in this work for the first time, caused by the combination of dense fog and large moths partially obstructing the beam. We demonstrate here an interesting case of a moth where left- and right-wing movements induced oscillations in both intensity and pixel spread. In addition, we were able to identify the dorsal and ventral sides of the wings by estimating the corresponding melanization with the dual-band lidar. We demonstrate that the wing beat trajectories in the dual-band parameter space are complementary rather than covarying or redundant, thus a dual-band entomological lidar approach to biodiversity studies is feasible in situ and endows species specificity differentiation. Future improvements are discussed. The introduction of these methodologies opens the door to a wealth of possible experiments to monitor, understand, and safeguard the biological resources of one of the most biodiverse countries on Earth.}},
author = {{Santos, Victor and Costa-Vera, Cesar and Rivera-Parra, Pamela and Burneo, Santiago and Molina, Juan and Encalada, Diana and Salvador, Jacobo and Brydegaard, Mikkel}},
issn = {{1943-3530}},
keywords = {{Scheimpflug lidar; entomological sensor; dual-band ranger; insect activity; foggy conditions; frequency domain}},
language = {{eng}},
number = {{6}},
pages = {{593--602}},
publisher = {{Society for Applied Spectroscopy}},
series = {{Applied Spectroscopy}},
title = {{Dual-Band Infrared Scheimpflug Lidar Reveals Insect Activity in a Tropical Cloud Forest}},
url = {{https://lup.lub.lu.se/search/files/145888859/ASP_23_0007.R2_Proof_hi.pdf}},
doi = {{10.1177/00037028231169302}},
volume = {{77}},
year = {{2023}},
}