Non destructive evaluation of degraded concrete cover using high-frequency ultrasound

2002 ◽  
Author(s):  
M. Goueygou ◽  
S.O. Naffa ◽  
B. Piwakowski ◽  
F. Buyle-Bodin
Keyword(s):  
High Frequency ◽  
Concrete Cover ◽  
High Frequency Ultrasound ◽  
Non Destructive Evaluation ◽  
Non Destructive ◽  
Frequency Ultrasound

Effectiveness of Dynamic Response Spectroscopy and Microwave Inspection Technology for Substrate Pipe and Composite Wraps

2021 ◽  
Author(s):  
Rehan Ahmed ◽  
Siti Haslina Mohd Ramli ◽  
Fadhlan B. A. Aziz ◽  
Rosman Arifin
Keyword(s):  
High Frequency ◽  
Technology Selection ◽  
Mapping Technique ◽  
Detailed Result ◽  
Non Destructive Testing ◽  
High Frequency Ultrasound ◽  
Direct Response ◽  
Destructive Testing ◽  
Non Destructive ◽  
Frequency Ultrasound

Abstract This paper discusses in depth the technical differentiations of the Direct Response Spectroscopy (DRS) and Microwave (MW) system along with its capabilities of inspecting through various hard to inspect coatings and wraps, making the DRS and MW combo an ideal inspection technique. As with every technology, the limitations of the DRS and MW systems will also be covered to give an unbiased view in the technology selection. This paper will also course through the successful trial at one of PETRONAS operating onshore plants with the detailed result presentation concluding with the efficiency and cost effectiveness of employing the DRS and MW for inspection of composite wraps. The DRS and MW systems, both proprietary technologies developed by Sonomatic, are used in combination to assess the integrity of pipes and pipelines under composite overwrap repairs. These Non-Destructive Testing technique. are robust, reliable and possess the ability to inspect composite overwrap repairs and the piping substrate while online. The DRS is essentially an ultrasonic corrosion mapping technique that Measures steel WT with ±0.5 mm accuracy and identifies flaws in composite materials. It is engineered to excite the steel with low ultrasonic frequencies where conventional high frequency ultrasound could not penetrate. The MW measures depth of flaws in the wrapping materials identified by DRS inspection. It operates on very low power and is excellent on the inspection of non-conductive material.

scholarly journals Effectiveness of high frequency ultrasound on pressure ulcer

Medicine ◽  
2019 ◽  
Vol 98 (37) ◽  
pp. e17111 ◽  
Author(s):  
Xiang-qin Gao ◽  
Xiao-mei Xue ◽  
Jian-kang Zhang ◽  
Fei Yan ◽  
Qiu-xia Mu
Keyword(s):  
Pressure Ulcer ◽  
High Frequency ◽  
High Frequency Ultrasound ◽  
Frequency Ultrasound

Evaluation of frontal fibrosing alopecia with ultra‐high‐frequency ultrasound

2021 ◽  
Author(s):  
Carolina Ávila de Almeida ◽  
Simone Guarçoni ◽  
Bruna Duque Estrada ◽  
Maria Carolina Zafra Páez ◽  
Clarissa Canella
Keyword(s):  
High Frequency ◽  
High Frequency Ultrasound ◽  
Ultra High Frequency ◽  
Frequency Ultrasound

scholarly journals Morphologic Features of Cutaneous T-Cell Lymphomas Using Dermoscopy and High Frequency Ultrasound

2020 ◽  
Vol 10 (1) ◽  
pp. 17
Author(s):  
Iris Wohlmuth-Wieser ◽  
Joel M. Ramjist ◽  
Neil Shear ◽  
Raed Alhusayen
Keyword(s):  
T Cell ◽  
High Frequency ◽  
Early Stage ◽  
Skin Lesions ◽  
Diagnostic Tools ◽  
Skin Thickness ◽  
High Frequency Ultrasound ◽  
T Cell Lymphomas ◽  
Standardized Parameters ◽  
Frequency Ultrasound

The diagnosis of cutaneous T-cell lymphomas (CTCL) is frequently delayed by a median of three years and requires the clinical evaluation of an experienced dermatologist and a confirmatory skin biopsy. Dermoscopy and high-frequency ultrasound (HFUS) represent two non-invasive diagnostic tools. While dermoscopy is inexpensive and widely used for the diagnosis of melanoma and non-melanoma skin cancers, HFUS of skin lymphomas represents a novel diagnostic approach that is not yet implemented in the routine dermatologic practice. The aim of our study was to prospectively assess skin lesions of patients with either CTCL patches or plaques with dermoscopy and HFUS and to compare the findings with atopic dermatitis (AD) and psoriasis. Thirteen patients with an established diagnosis of CTCL, psoriasis, or AD were studied: Dermoscopy features including spermatozoa-like structures and the presence of white scales could assist in differentiating between early-stage CTCL and AD. HFUS measurements of the skin thickness indicated increased epidermal-, thickness in CTCL, and psoriasis compared with AD. Our results support the use of dermoscopy as a useful tool to diagnose CTCL. HFUS could augment the dermatologic assessment, but further studies will be needed to define standardized parameters.

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