Scattering from thin dielectric disks

Vine, David Le; Schneider, Axel; Lang, Roger H.; Carter, H.

doi:10.1109/tap.1985.1143534

Cited by 65 publications

(14 citation statements)

References 10 publications

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“…For leaves, the returns are calculated using the physical optics approximation for elliptic discs [6], which assumes the internal field inside the disc to be the same as that of the infinitely extended dielectric layer of the same thickness. The effects of attenuation on the coherent wave caused by the inhomogeneities are also taken into account using Foldy's approximation [18].…”

Section: Electromagnetic Scattering From the Rice Plantsmentioning

confidence: 99%

Electromagnetic Scattering Model for Rice Canopy Based on Monte Carlo Simulation

Wang¹,

Kong²,

Ding³

et al. 2005

PIER

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Abstract-A scattering model for rice canopy based on Monte Carlo simulations is applied to interpret RADARSAT data and to predict the temporal response of rice growth. The model takes into account the coherent wave interactions among vegetative elements which usually occur in clusters with closely spaced elements. returns. Simulation results show a significant difference in L-band backscattering returns from rice fields with different structures, and are consistent with empirical observations from JERS-1 Campaign. Taking the ratio of HH over VV can help eliminating ambiguities in this inverse scattering problem.

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Section: Electromagnetic Scattering From the Rice Plantsmentioning

confidence: 99%

Electromagnetic Scattering Model for Rice Canopy Based on Monte Carlo Simulation

Wang¹,

Kong²,

Ding³

et al. 2005

PIER

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“…Very large plane particles (high-frequency approximation). The absorption and scattering cross sections of these particles can be expressed (neglecting edge effects) in terms of the reflection coefficient R and the transmission coefficient T of an infinite layer of the same thickness (Le Vine et al, 1985;Chukhlantsev, 1981Chukhlantsev, , 1986 …”

Section: Theoretical Modelsmentioning

confidence: 99%

“…The presence of resonance effects in the extinction by leaves was also confirmed experimentally (see Chapter 5). A simpler approach for the inner field was proposed in Le Vine et al (1985), where it was shown that, for a physically and electrically thin disk, the field inside a slab of the same thickness can be used as the inner field. This approach yields good agreement with experiments and is convenient for the modeling due to its relative ease.…”

mentioning

confidence: 99%

Microwave radiometry of vegetation canopies

Milshin¹

2006

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“…Here`thin' implies that k o T %1 for the disc and, k o a%1 for the cylinder (LeVine et al 1985). Here k o is the wave number, T and a are disc thickness and cylinder radius respectively.…”

Section: Downloaded By [University Of Saskatchewan Library] At 14:14 mentioning

confidence: 99%

Radar backscattering from alfalfa canopy: A clump modelling approach

Chauhan¹,

Lang²

1999

International Journal of Remote Sensing

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Vegetation in the microwave regime can be modelled by replacing vegetation scattering elements (stems, lea¯ets, etc.) by their dielectric equivalents. Unlike most vegetation, the scattering elements in the alfalfa canopy are not independent of one another at L-band and they also exhibit a unique geometrical structure. This structural feature of the alfalfa canopy has been incorporated into a modelling procedure to predict radar response from the canopy. An alfalfa plant is modelled as a conical clump of stems that are clustered with lea¯ets. The scattering amplitude of this structural unit (clump) is calculated by the coherent addition of amplitudes from the individual stems. The calculations are done for L-band, where the lea¯et size as well as the average distance among the lea¯ets are small compared to the wavelength.Careful ground and canopy geometry data were collected during the WASHITA'92 experiment conducted in Chickasha, Oklahoma in June 1992. The clump characteristics such as the number of stems with a common root, clump geometry, clustering factor of the leaves, etc., were measured in addition to sizes, density distributions of the stems and the leaves. These measured parameters of the alfalfa canopy have been used in a distorted Born approximation to compute the backscattering coe cient. For comparison, the backscatter from the alfalfa canopy is also computed using a conventional modelling procedure. In this approach, the vegetation is modelled as a random, independent, non-clump distribution of stems and lea¯ets. The theoretical results with and without the clumping structure are compared with one another and also with the experimental data obtained by the NASA truck based radar. There is a reasonable agreement between the clump model and the data. More importantly, the present study emphasizes the importance of coherence e ects among di erent scattering elements in a canopy and the need to model them by identifying a respective structural unit for a particular canopy.

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Scattering from thin dielectric disks

Cited by 65 publications

References 10 publications

Electromagnetic Scattering Model for Rice Canopy Based on Monte Carlo Simulation

Electromagnetic Scattering Model for Rice Canopy Based on Monte Carlo Simulation

Microwave radiometry of vegetation canopies

Radar backscattering from alfalfa canopy: A clump modelling approach

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