Short-Wave infrared atmospheric scheimpflug lidar

Brydegaard, Mikkel; Larsson, Jim; Török, Sandra; Malmqvist, Ebba; Zhao, Guangyu; Jansson, Samuel; Andersson, Mariam; Svanberg, Sune; Åkesson, Susanne; Laurell, Fredrik; Bood, Joakim

doi:10.1051/epjconf/201817601012

Cited by 14 publications

(15 citation statements)

References 13 publications

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“…The region has a number of widespread high‐power lasers (W‐kW) such as the fundamental outputs of Nd:YAG, Erbium fiber lasers as well as diode lasers, not the least at the telecom band at 1550 nm. For detection, InGaAs sensors are available as quadrants, avalanche photo diodes (APDs) and 1D and 2D arrays for a prize ten times that of Si detectors, but still available off‐the‐shelf . A peculiar feature of aerofauna in the SWIR region is that melanin absorption is absent, and thus birds and insects can be assumed white at 1064–1320 nm .…”

Section: Detection and Light Interactions With Aquatic‐ And Aerofaunamentioning

confidence: 99%

“…Beam splitters or sandwiched photodiodes (e.g., Si/InGaAs) may be employed to retrieve various broad bands of the scattered sunlight at kHz rates . An important application of InGaAs detectors and bands in the short‐wave infrared, is the assessment of body and wing melanization . Melanin is the most widespread pigment of aerofauna and the NIR/SWIR melanization ratio has been shown to be largely independent of the observation angle, and precise quantification allows distinguishing closely related species .…”

Section: Remote Sensing Of Atmospheric and Aquatic Faunamentioning

confidence: 99%

“…Similarly to early entomological lidar work from Montana, the method has proven capable of remotely retrieving modulation signatures from insect wing beats. The method has further been extended to include multiband elastic sounding and polarimetric retrieval of wing beats . The method has been pursued using both Si‐ and InGaAs arrays, which cover eye‐safe bands in the SWIR region.…”

Section: Remote Sensing Of Atmospheric and Aquatic Faunamentioning

confidence: 99%

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Photonic Monitoring of Atmospheric and Aquatic Fauna

Brydegaard

Svanberg

2018

Laser & Photonics Reviews

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Flying insects are of utmost importance in ecology and for human living conditions. Certain species serve as indispensable pollinators to ensure the availability of food stuffs, while others are dangerous vectors for spreading deadly diseases, such as malaria. Agricultural pests reduce the yield of crops, and their abatement through pesticides cause many additional problems. Birds and bats are frequently carriers of diseases, which, especially for long‐distance migrants, cause serious consequences. Clearly, there is high motivation to be able to effectively identify and quantify flying fauna. Here, the emerging field of optics and laser‐based monitoring of flying fauna is reviewed with an emphasis on remote sensing based on pulsed and contineous wave (CW) lidar systems, and how they complement existing radar techniques. Furthermore, ground‐truth laboratory studies are covered. Wing‐beat and overtone spectra as well as reflectance, depolarization and fluorescence properties are studied. The aquatic environment is for many reasons less accessible for optical studies, but is clearly also of great importance. Phytoplankton constitute the start of the aquatic food chain, followed by zooplankton and a long chain of higher animals, including fish, an important part of the human food supply. Finally, how optical monitoring can complement sonar and sampling techniques is discussed.

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Section: Detection and Light Interactions With Aquatic‐ And Aerofaunamentioning

confidence: 99%

Section: Remote Sensing Of Atmospheric and Aquatic Faunamentioning

confidence: 99%

Section: Remote Sensing Of Atmospheric and Aquatic Faunamentioning

confidence: 99%

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Photonic Monitoring of Atmospheric and Aquatic Fauna

Brydegaard

Svanberg

2018

Laser & Photonics Reviews

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“…A common detector array behind a linear polarizer is utilized. Similar systems, now with two lasers of different wavelengths, have been describedat 405 and 808 nm [12], and more recently at 980 and 1550 nm [13], and have been used, e.g. for atmospheric particle characterization.…”

Section: Field Test and Arrangementsmentioning

confidence: 99%

Insect remote sensing using a polarization sensitive cw lidar system in chinese rice fields

Zhu

Malmqvist

et al. 2018

EPJ Web Conf.

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A joint Chinese-Swedish field campaign of Scheimpflug continuous-wave lidar monitoring of rice-field flying pest insects was pursued in very hot July weather conditions close to Guangzhou, China. The occurrence of insects, birds and bats with almost 200 hours of round-the-clock polarization-sensitive recordings was studied. Wing-beat frequency recordings and depolarization properties were used for target classification. Influence of weather conditions on the flying fauna was also investigated.

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“…The Scheimpflug lidar technique has recently been developed for atmospheric aerosol monitoring, combustion diagnostics, etc. [30][31][32][33][34][35][36][37][38][39][40]. The range-resolved atmospheric backscattering signal can be retrieved by a Scheimpflug-principle based imaging system.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Studies on Atmospheric Monitoring by Employing a Portable Unmanned Mie-Scattering Scheimpflug Lidar System

Zhi

et al. 2019

Remote Sensing

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A portable unmanned Mie-scattering Scheimpflug lidar system has been designed and implemented for atmospheric remote sensing. The Scheimpflug lidar system employs a continuous-wave high-power 808 nm laser diode as the light source and the emitted laser beam is collimated by an F6 lens with a 100 mm aperture. Atmospheric backscattering light is collected by a F5 lens with a 150 mm aperture and then detected by a 45° tilted image sensor. The separation between the transmitting and the receiving optics is about 756 mm to satisfy the Scheimpflug principle. Unmanned outdoor atmospheric measurements were performed in an urban area to investigate system performance. Localized emissions can be identified by performing horizontal scanning measurements over the urban atmosphere for 107° approximately every 17 min. The temporal variation of the vertical aerosol structure in the boundary layer has also been studied through zenith scanning measurements. The promising result shows great potential of the present portable lidar system for unmanned atmospheric pollution monitoring in urban areas.

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Short-Wave infrared atmospheric scheimpflug lidar

Cited by 14 publications

References 13 publications

Photonic Monitoring of Atmospheric and Aquatic Fauna

Photonic Monitoring of Atmospheric and Aquatic Fauna

Insect remote sensing using a polarization sensitive cw lidar system in chinese rice fields

Preliminary Studies on Atmospheric Monitoring by Employing a Portable Unmanned Mie-Scattering Scheimpflug Lidar System

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