A four-point electrical resistivity method for detecting wood decay and hollows in living trees

Soge, Ayodele O.; Popoola, O. I.; Adetoyinbo, A.A.

doi:10.1007/s00107-019-01402-1

Cited by 14 publications

(9 citation statements)

References 11 publications

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“…Az elektromos mező torzulásából nem lehet egyértelmű következtetést levonni. Ennek oka ugyanis lehet egy üreg jelenléte, gombás fertőzés, de hasonló mérési eredményt mutat a műszer akkor is, ha a fában felhalmozódó fémes ionok, vagy magas víztartalom figyelhető meg [42]. Használata (sok elektróda szükséges hozzá) és az adatok értelmezése is bonyolult [31]; [42], emellett a problémás terület nagyságát nem képes pontosan meghatározni [18] így ritkán használják.…”

Section: Impedancia Tomográfunclassified

Városi fák vizsgálati módszerei

Ecseri

2024

Gradus

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Az utóbbi években a megváltozott klíma komoly kihívások elé állította a zöldfelületeken megtalálható növényállományt. A fokozódó növényegészségügyi problémák mellett az időjárás extrém jelenségei is nehezítik a fák életét a városban. A lakosság aggódva figyeli az orkán erejű szélben mozgó lombkoronát, vagy a törzsön kialakuló odvasodásokat. Ugyanakkor társadalmi ’elvárás’ – valamint a fenntarthatóság szempontjából is fontos érdek – a városi fák életének meghosszabbítása a kivágásuk helyett. Mit tehetünk? Elsőként a probléma ’gyökerét’ kell feltárnunk, melyre – többek között – az alábbiakban ismertetett módszerek állnak a faápoló szakemberek rendelkezésére.

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Section: Impedancia Tomográfunclassified

Városi fák vizsgálati módszerei

Ecseri

2024

Gradus

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“…where ρ VDP is the resistivity calculated using equation (15), while the cylinder resistivity isρ 0 . With equations ( 10)-( 12) under a symmetrical configuration, CF can be simplified as follows:…”

Section: Cf Analysismentioning

confidence: 99%

“…However, the excitation electrodes of constant current supplies are rarely placed at the end of the cylinder during living and serving periods, such as piers for sea-crossing bridges, living trunks, and wooden bearing pillars in historic buildings. The four-probe methods (Wenner, Schlumberger, poledipole, and dipole-dipole arrays) are deducted from the half plane [15][16][17]; therefore, the boundary effect of the cylinder shape should be considered in the inversion algorithm, which is complex for a macroscopic homogeneous material. Similarly, ERT technology also depends on the complex and unconventional inversion algorithm for cylinder boundaries [18], and many probes are inserted into the sample, especially for slender columns.…”

Section: Introductionmentioning

confidence: 99%

A novel resistivity measurement method for a homogeneous cylinder shape based on the vdP configuration

Ma¹,

Chen²,

YiFei³

et al. 2022

Meas. Sci. Technol.

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The electrical resistivity method for a cylinder shape is an essential method for reflecting physical properties. However, the use of a nondestructive resistivity method with the circumferential cross-section arrangement for working components remains challenging. This paper provides a simple novel resistivity method for a cylinder shape based on the vdP configuration, with four electrodes placed near the middle cross-section layer of shape. First, the theoretical solution formulae for the electrostatic potential function in the cylindrical coordinate system are derived. Then, the effect of the electrode and shape size is analysed. The results show that the electrode height is less than 1% of the cylinder height and the radian angle is less than 10°, where the electrode size effect on the correction factor (CF) can be ignored, and CF rarely depends on the cylinder shape. Finally, a prototype is designed, and the proposed method is verified in laboratory tests using geomaterials. The performance of the proposed method for fine soil at high moisture contents is found to be better than that at low moisture contents.

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“…One major importance of acoustic technology that is of interest to forest managers is the assessment of tree and log qualities through the detection of deterioration (decay) (Wang et al, 2004a). Some of the challenges associated with tree decay and failure are loss of lives, and properties (Johnstone et al, 2015; Soge et al, 2018; Soge et al, 2019), economic and ecological values of a tree (Soge et al, 2018), and dimensional instability during service, amongst others. Therefore, providing adequate information on effective non-destructive evaluation methods would help forest managers identify hazardous trees, prevent the spread of decay, and improve stand conditions.…”

Section: Introductionmentioning

confidence: 99%

Non-destructive acoustic assessment of wood quality in trees and logs and the effects of silvicultural treatments: a review

Olaoye

Ojo

2022

International Wood Products Journal

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Assessing intrinsic wood qualities such as modulus of elasticity and internal decay in trees and logs can be challenging. However, acoustic technologies have been investigated for a possible solution. This paper reviews available literature on non-destructive acoustic methods for assessing wood quality, both in tree and log form. The paper further reviews the effects of silvicultural practices (such as thinning and pruning) on wood quality assessed by nondestructive acoustic methods. We documented some of the benefits of application of nondestructive acoustic methods on wood quality of trees and logs. The acoustic velocity of a tree (V T ) or log (V L ) of the propagated waves and wood density can be used to determine the Dynamic Modulus of Elasticity (MOEd). Thinning was reported to affect V T /V L and MOEd negatively. Acoustic tomography methods were equally found to have good accuracy in detecting the location and extent of wood decay in standing trees and logs.

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A four-point electrical resistivity method for detecting wood decay and hollows in living trees

Cited by 14 publications

References 11 publications

Városi fák vizsgálati módszerei

Városi fák vizsgálati módszerei

A novel resistivity measurement method for a homogeneous cylinder shape based on the vdP configuration

Non-destructive acoustic assessment of wood quality in trees and logs and the effects of silvicultural treatments: a review

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