Investigation of atmospheric insect wing-beat frequencies and iridescence features using a multispectral kHz remote detection system

Gebru, Alem; Rohwer, Erich G.; Neethling, Pieter; Brydegaard, Mikkel

doi:10.1117/1.jrs.8.083503

Cited by 19 publications

(23 citation statements)

References 52 publications

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“…The data that support the findings of this study are openly available in [Oxford Academic] at https://doi.org/%5B10.1093/ee/37.3.774], (Feng et al, ). The data that support the findings of this study are openly available in [SPIE Digital Library] at https://doi.org/%5B10.1117/1.JRS.8.083503], (Gebru et al, ). The data that support the findings of this study are openly available in [OSA Publishing] at https://doi.org/%5B10.1364/AO.49.005133], (Guan et al, ).…”

Section: Data Availability Statementsupporting

confidence: 66%

“…More general ecological monitoring of flying insects was introduced by the Lund University group, which originally used a pulsed lidar system and recorded laser-induced endogenous fluorescence, or signals from powder tagged insects (Brydegaard, Guan, Wellenreuther, & Svanberg, 2009;Guan et al, 2010;Mei et al, 2012). The Lund group further introduced a passive, darkfield insect remote sensing technique, where the spikes due to light scattering from sun-illuminated insects were detected against a dark optical path-length termination (Gebru, Rohwer, Neethling, & Brydegaard, 2014;Runemark, Wellenreuther, Jayaweera, Svanberg, & Brydegaard, 2012). The dark-field technique was employed by the South China Normal University group, which also extended the technique to night-time field observations, where the insects were illuminated by broad-band white-light lamps (Zhu et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Application of lidar remote sensing of insects in agricultural entomology on the Chinese scene

Song

Zhang

Feng

et al. 2019

J Applied Entomology

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Insect pest management is a very important aspect for plant protection in crops production. Remote sensing provides a large number of techniques that are beneficial in entomological research. Although entomological radars have been used for studying migrations of insects for many years, most of entomological radar studies have been vertically tracing high‐altitude migration behaviour of insects. Light detection and ranging (lidar) is a counterpart to radar, now operating in the optical part of the electromagnetic spectrum, which has been recently applied for monitoring of insects at low altitude. Such techniques, in particular low‐cost continuous‐wave (CW) bi‐static systems based on the Scheimpflug arrangement, have been rapidly developing during the last decade. As a result, optical methods present new and fascinating possibilities. Based on experience from a 2‐week field campaign in rice paddy fields, we here present an overview of lidar remote sensing applied to the Chinese scene. The capability of a CW Scheimpflug lidar system in monitoring the insects was studied. We present results on insect abundance in relation to time of the day and weather conditions. We also identified insect species by analysing wing‐beat frequencies and studied their attraction to ultraviolet (UV) lamp located close to the horizontal laser sampling path during night time. Results showed that the insect species were abundant, that insects detected by the lidar system were attracted to light and that light rain increased the insect activity. The lidar detection system had a high read‐out frequency, enabling the estimation of insect wing‐beat frequencies.

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Section: Data Availability Statementsupporting

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Application of lidar remote sensing of insects in agricultural entomology on the Chinese scene

Song

Zhang

Feng

et al. 2019

J Applied Entomology

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“…Methods such as lunar obscuration, digital in‐line holography and various entomological modulation spectroscopy devices operate in transmission mode close to 0° in the angular domain. Passive dark‐field methods based on sunlight, where the field‐of‐view is terminated in a black cavity, operate at angles between 180° and 90°. In most situations regarding sparse organism detection, organisms would only account for a fraction of the probe volume in efficient detection schemes capable of detecting large numbers.…”

Section: Detection and Light Interactions With Aquatic‐ And Aerofaunamentioning

confidence: 99%

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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“…Our group has also developed passive, so-called dark-field methods [25] based on sunlight illumination of the field of view (FOV). Remote dark-field methods yield comparable results to entomological lidar, but with much simpler instrumentation [26,27]. By relying on sunlight, these methods are limited to daytime use and clear-sky conditions.…”

Section: Introductionmentioning

confidence: 94%

Passive kHz lidar for the quantification of insect activity and dispersal

Jansson

Brydegaard

2018

Anim Biotelemetry

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Background: In recent years, our group has developed electro-optical remote sensing methods for the monitoring and classification of aerofauna. These methods include active lidar methods and passive, so-called dark-field methods that measure scattered sunlight. In comparison with satellite-and airborne remote sensing, our methods offer a spatiotemporal resolution several orders of magnitude higher, and unlike radar, they can be employed close to ground. Whereas passive methods are desirable due to lower power consumption and ease of use, they have until now lacked ranging capabilities. Results:In this work, we demonstrate how passive ranging of sparse insects transiting the probe volume can be achieved with quadrant sensors. Insects are simulated in a raytracing model of the probe volume, and a ranging equation is devised based on the simulations. The ranging equation is implemented and validated with field data, and system parameters that vary with range are investigated. A model for estimating insect flight headings with modulation spectroscopy is implemented and tested with inconclusive results. Insect fluxes are retrieved through time-lag correlation of quadrant detector segments, showing that insects flew more with than against the wind during the study period. Conclusions:The presented method demonstrates how ranging can be achieved with quadrant sensors, and how it can be implemented with or without active illumination. A number of insect flight parameters can be extracted from the data produced by the sensor and correlated with complementary information about weather and topography. The approach has the potential to become a widespread and simple tool for monitoring abundances and fluxes of pests and disease vectors in the atmosphere.

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Investigation of atmospheric insect wing-beat frequencies and iridescence features using a multispectral kHz remote detection system

Cited by 19 publications

References 52 publications

Application of lidar remote sensing of insects in agricultural entomology on the Chinese scene

Application of lidar remote sensing of insects in agricultural entomology on the Chinese scene

Photonic Monitoring of Atmospheric and Aquatic Fauna

Passive kHz lidar for the quantification of insect activity and dispersal

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