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Acoustic resonance technology is an acoustic inspection technology developed by Det Norske Veritas over the past 20 years. ART exploits the phenomenon of half-wave resonance, whereby a suitably excited resonant target (such as a pipeline wall) exhibits longitudinal resonances at certain frequencies characteristic of the target's thickness. Knowing the speed of sound in the target material, the half-wave resonant frequencies can be used to calculate the target's thickness. ART differs from traditional Ultrasonic Testing: although both are forms of nondestructive testing based on acoustics, ART generally uses lower frequencies and has a wider bandwidth. This has enabled its use in gaseous environments without a liquid couplant. Det Norske Veritas has licensed the technology for use in on-shore water pipes world-wide to Breivoll Inspection Technologies AS. Breivoll has proven the efficiency of the technology in assessing the condition of metallic water pipes, both with and without coating. The company has since 2008 successfully developed a method to enter and inspect water mains, and is a world-leader in their market.〔http://en.breivoll.no/white_papers/ Whitepaper on condition assessment of water pipes with the use of ART at Breivoll Inspection Technologies, February 2012.〕 ART has also been used in field tests〔(Press release from Gassco, 29 May 2009 )〕 at Gassco's Kårstø facility. In 2012 DNV's ART activities were spun out into a subsidiary (HalfWave ) ==Main features of ART== * Uses lower frequencies than Ultrasonic Testing * Effective in gases and liquids (i.e. requires no liquid couplant) * Can be used to characterize multi-layered media (e.g. pipelines with coatings) * Can penetrate coatings * Can measure inside and outside metal loss 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Acoustic resonance technology」の詳細全文を読む スポンサード リンク
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