Scanning Technique to Identify Biologically Degraded Wood

Ross, Robert; DeGroot, Rodney C.

doi:10.1111/j.1747-1567.1998.tb01282.x

Cited by 6 publications

(2 citation statements)

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“…In a previous publica-. ner significantly different from that of other similar systems tion, 1 we reported on an inexpensive experimental technique . or the surrounding sections of the system, a more extensive that was developed to observe longitudinal stress wave be-.…”

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confidence: 57%

Transverse Vibration Technique to Identify Deteriorated Wood Floor Systems

Ross¹,

Wang²,

Hunt³

et al. 2002

Experimental Techniques

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KEYWORDS: Floor System, Nondestructive Evaluation, . Currently, the use of stress wave techniques is limited to NDE . individual wood members. Evaluating each member of a . structural system is labor intensive and time consuming. For he Forest Products Laboratory, USDA Forest Ser-. in situ inspection of timber structures, a more efficient stratvice, has been developing nondestructive evaluation . egy would be to screen whole structural systems or subsys-(NDE) techniques to identify degradation of wood . tems in terms of their overall performance and serviceability. in structures and the performance characteristics . Examining the dynamic response of the structural system trasonic transmission NDE techniques for both laboratory any organisin reduces the strength and stiffness of the mathat remain in the structure. This work has focused on using . might provide an alternative way to gain insight into the dynamic testing techniques, particularly stress wave and ul-. ongoing performance of the system. Deterioration caused by and field investigations.. . terials and thus could affect the dynamic behavior of the . system. If, for example, one structural system or sections of Our initial efforts were aimed at using stress wave tech-. the system were found to respond to dynamic loads in a manniques to identify wood degradation. In a previous publica-. ner significantly different from that of other similar systems tion, 1 we reported on an inexpensive experimental technique . or the surrounding sections of the system, a more extensive that was developed to observe longitudinal stress wave be-. inspection of that system or section would be warranted. havior in small wood specimens. The technique utilized a .mechanical impactor to induce a wave in the specimen. Wave . Based on this conceptual strategy, we began to investigate propagation was observed by placing a piezo film sensor on . the possibility of using transverse vibration techniques to inspect full-size wood floor T the surface of the wood. Output of the sensor was recorded and displayed on a digital storage oscilloscope. This technique enabled us to examine fundamental wave propagation characteristics and the biological degradation of wood. Recently, we investigated the use of speed of sound transmission to locate degraded regions in wood materials. 2 The test setup we developed consisted of two 84-kHz rolling transducers coupled to an ultrasonic systems by evaluating component systems. This paper describes the experimental setup developed for our research and typical results obtained from its use. TRANSVERSE VIBRATIONTransverse vibration techniques have received considerable attention for NDT applications in the wood industry.3 To illustrate these methods, an analogy can be drawn between the behavior of a vibrating beam and the vibration of a mass that is attached to a weightless spring transmitting and receiving Fig. I : Mass-spring dashpot vibration model (left) and unit. A stress wave was introduced into a specimen in the transverse direction by transversely...

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confidence: 57%

Transverse Vibration Technique to Identify Deteriorated Wood Floor Systems

Ross¹,

Wang²,

Hunt³

et al. 2002

Experimental Techniques

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“…When some internal defects are present, they affect the speed of sound propagation in wood (Sandoz and Lorin 1996;Ross and De Groot 1998;Martinis et al 2004;Wang 2013;Wu et al 2018;Moravcki et al 2021), providing clues about the internal structure. However, the speed of sound propagation is influenced by a lot of factors, of which not all could be seen as defects, i.e., factors that do not affect the integrity of wood.…”

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confidence: 99%

The agreement in accuracy between tomograms, resistograms, and the actual condition of the wood from lime trees harvested from cities

Musat

2023

BioRes

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The internal quality of the wood is one of the main factors affecting the stability of trees, and it has always been of great interest to science and practice. For this reason, the present study aims to compare the results obtained by wood tomograms with those of resistance to drilling and the visual appearance after cutting a slice with a chain-saw, both to evaluate the presence and dimensions of the inside defects, and also to evaluate the irregularities of the wood structure. Round pieces of lime wood harvested from public areas were used for comparison by taking sound tomograms, followed by taking resistograms on two perpendicular directions at the same level. The results showed that internal wood defects are not always the ones that lead to reduced speeds of sound propagation through the wood. In addition, there were instances in which changes in the internal structure of the wood led to improperly colored tomograms, namely the sections characterizing the point of insertion of a thick branch in the trunk, where the tomograms indicated low speeds of sound transfer through the wood in the stem and high speeds in the wood of the branch.

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Method of check analysis of microwave-modified wood

Mekhtiev

Torgovnikov

2004

Wood Sci Technol

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Scanning Technique to Identify Biologically Degraded Wood

Cited by 6 publications

References 1 publication

Transverse Vibration Technique to Identify Deteriorated Wood Floor Systems

Transverse Vibration Technique to Identify Deteriorated Wood Floor Systems

The agreement in accuracy between tomograms, resistograms, and the actual condition of the wood from lime trees harvested from cities

Method of check analysis of microwave-modified wood

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