Rare Events in Remote Dark-Field Spectroscopy: An Ecological Case Study of Insects

Runemark, Anna; Wellenreuther, Maren; Jayaweera, H. H. E.; Svanberg, Sune; Brydegaard, Mikkel

doi:10.1109/jstqe.2012.2184528

Cited by 29 publications

(40 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While research in the area of radar entomology has been conducted over several decades and numerous interesting applications have been described [4], laser radar (light detection and ranging; lidar) systems in the optical regime have the potential of achieving a far better sensitivity and address and classify even the tiniest insects, simply because most insects are much smaller than the wavelengths of microwaves used in radars but larger than the wavelengths of light. Further, optical off-the-shelf components allow spectral-and polarimetric target classification, providing molecular as well as microstructure information [5,6]. Along these lines our group has previously demonstrated lidar remote detection of insects labeled with fluorescent powders, e.g., for assessing dispersal rates on a landscape scale [7,8].…”

Section: Remote Optical In-situ Insect Monitoringmentioning

confidence: 99%

“…Although trapping allows precise studies with microscopes, mass spectrometry or genetics, online optical monitoring allows quantitative measures in terms of individuals per cubic meter per hour. A particularly simple and powerful approach to optical monitoring of insects is to direct a telescope towards a remote very black cavity [6]. When a sun-lit insect flies into the telescope field of view (FOV) the scattered light is observed on a close to zero background.…”

Section: Remote Optical In-situ Insect Monitoringmentioning

confidence: 99%

“…The instant optical monitoring allows precise activity correlation with environmental factors such as temperature and wind [6]. Furthermore, time-lag correlation analyses on the millisecond timescale between the occurrences of different insects occupying the probed air-volume reveal the interaction strength and kinetics between insect types [6].…”

Section: Remote Optical In-situ Insect Monitoringmentioning

confidence: 99%

“…Furthermore, time-lag correlation analyses on the millisecond timescale between the occurrences of different insects occupying the probed air-volume reveal the interaction strength and kinetics between insect types [6]. A common observation is, for instance, that the likelihood of observing, e.g., a large predating dragonfly in a confined air-volume, significantly increases when that same air-volume was occupied by a prey in the previous milliseconds.…”

Section: Remote Optical In-situ Insect Monitoringmentioning

confidence: 99%

“…Actually, most ground topography is varying on a spatial scale where conventional lidars can provide resolution, e.g., of the confinements due to preferred plants and similar [7]. However, when considering in-situ assessment of interaction kinetics and strength, insects, birds or bats appear separated by few centimeters or even appear in tandem flights [6].…”

Section: Approaches and Reasons For Breaking The Diffraction Limitmentioning

confidence: 99%

See 4 more Smart Citations

SUPER RESOLUTION LASER RADAR WITH BLINKING ATMOSPHERIC PARTICLES ---- APPLICATION TO INTERACTING FLYING INSECTS (Invited Paper)

Brydegaard¹,

Gebru²,

Svanberg³

2014

PIER

View full text Add to dashboard Cite

Abstract-Assessment of biodiversity of pollinators on the landscape scale or estimation of fluxes of disease-transmitting biting midges constitutes a major technical challenge today. We have developed a laser-radar system for field entomology based on the so called Scheimpflug principle and a continuouswave laser. The sample-rate of this method is unconstrained by the round-trip time of the light, and the method allows assessment of the fast oscillatory insect wing-beats and harmonics over kilometers range, e.g., for species identification and relating abundances to the topography. Whereas range resolution in conventional lidars is limited by the pulse duration, systems of the Scheimpflug type are limited by the diffraction of the telescopes. However, in the case of sparse occurrence of the atmospheric insects, where the optical cross-section oscillates, estimation of the range and spacing between individuals with a precision beyond the diffraction limit is now demonstrated. This enables studies of insect interaction processes in-situ. REMOTE OPTICAL IN-SITU INSECT MONITORINGAlthough tiny in size, the massive number of insects makes them play a key role in most eco-systems around the globe. While the Western world experiences significant economic losses in agriculture due to lack of biodiversity and the colony collapse disorder of pollinators [1], disease vectors and pests are feared and, to a great extent, blamed for stagnating the development in tropical parts of the world.Whereas birds can be ring marked or tracked via GPS or sun loggers, only the very largest and least abundant insects can be equipped with electronic tags [2,3]. While research in the area of radar entomology has been conducted over several decades and numerous interesting applications have been described [4], laser radar (light detection and ranging; lidar) systems in the optical regime have the potential of achieving a far better sensitivity and address and classify even the tiniest insects, simply because most insects are much smaller than the wavelengths of microwaves used in radars but larger than the wavelengths of light. Further, optical off-the-shelf components allow spectral-and polarimetric target classification, providing molecular as well as microstructure information [5,6]. Along these lines our group has previously demonstrated lidar remote detection of insects labeled with fluorescent powders, e.g., for assessing dispersal rates on a landscape scale [7,8].Today a major limitation in ecological entomology is that insect abundance assessment is based on sweep nets, light-, pheromone-or CO 2 -traps. Placing and emptying the traps are tedious operations and constitute a major effort, and the results are known to be biased with respect to the species, sexes and age groups caught. Although trapping allows precise studies with microscopes, mass spectrometry

show abstract

Section: Remote Optical In-situ Insect Monitoringmentioning

confidence: 99%

Section: Remote Optical In-situ Insect Monitoringmentioning

confidence: 99%

Section: Remote Optical In-situ Insect Monitoringmentioning

confidence: 99%

Section: Remote Optical In-situ Insect Monitoringmentioning

confidence: 99%

Section: Approaches and Reasons For Breaking The Diffraction Limitmentioning

confidence: 99%

See 3 more Smart Citations

SUPER RESOLUTION LASER RADAR WITH BLINKING ATMOSPHERIC PARTICLES ---- APPLICATION TO INTERACTING FLYING INSECTS (Invited Paper)

Brydegaard¹,

Gebru²,

Svanberg³

2014

PIER

View full text Add to dashboard Cite

show abstract

Can the narrow red bands of dragonflies be used to perceive wing interference patterns?

Brydegaard

Jansson

Schulz

et al. 2018

Ecology and Evolution

View full text Add to dashboard Cite

Despite numerous studies of selection on position and number of spectral vision bands, explanations to the function of narrow spectral bands are lacking. We investigate dragonflies (Odonata), which have the narrowest spectral bands reported, in order to investigate what features these narrow spectral bands may be used to perceive. We address whether it is likely that narrow red bands can be used to identify conspecifics by the optical signature from wing interference patterns (WIPs). We investigate the optical signatures of Odonata wings using hyperspectral imaging, laser profiling, ellipsometry, polarimetric modulation spectroscopy, and laser radar experiments. Based on results, we estimate the prospects for Odonata perception of WIPs to identify conspecifics in the spectral, spatial, intensity, polarization, angular, and temporal domains. We find six lines of evidence consistent with an ability to perceive WIPs. First, the wing membrane thickness of the studied Odonata is 2.3 μm, coinciding with the maximal thickness perceivable by the reported bandwidth. Second, flat wings imply that WIPs persist from whole wings, which can be seen at a distance. Third, WIPs constitute a major brightness in the visual environment only second after the solar disk. Fourth, WIPs exhibit high degree of polarization and polarization vision coincides with frontal narrow red bands in Odonata. Fifth, the angular light incidence on the Odonata composite eye provides all prerequisites for direct assessment of the refractive index which is associated with age. Sixth, WIPs from conspecifics in flight make a significant contribution even to the fundamental wingbeat frequency within the flicker fusion bandwidth of Odonata vision. We conclude that it is likely that WIPs can be perceived by the narrow red bands found in some Odonata species and propose future behavioral and electrophysiological tests of this hypothesis.

show abstract

Photonic Monitoring of Atmospheric and Aquatic Fauna

Brydegaard

Svanberg

2018

Laser & Photonics Reviews

View full text Add to dashboard Cite

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.

show abstract

Rare Events in Remote Dark-Field Spectroscopy: An Ecological Case Study of Insects

Cited by 29 publications

References 30 publications

SUPER RESOLUTION LASER RADAR WITH BLINKING ATMOSPHERIC PARTICLES ---- APPLICATION TO INTERACTING FLYING INSECTS (Invited Paper)

SUPER RESOLUTION LASER RADAR WITH BLINKING ATMOSPHERIC PARTICLES ---- APPLICATION TO INTERACTING FLYING INSECTS (Invited Paper)

Can the narrow red bands of dragonflies be used to perceive wing interference patterns?

Photonic Monitoring of Atmospheric and Aquatic Fauna

Contact Info

Product

Resources

About