PMID- 28372132
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20190313
LR  - 20190313
IS  - 1520-8524 (Electronic)
IS  - 0001-4966 (Linking)
VI  - 141
IP  - 3
DP  - 2017 Mar
TI  - Ultrasonic attenuation and phase velocity of high-density polyethylene pipe 
      material.
PG  - 1535
LID - 10.1121/1.4976689 [doi]
AB  - Knowledge of acoustic properties is crucial for ultrasonic or sonic imaging and 
      signal detection in nondestructive evaluation (NDE), medical imaging, and 
      seismology. Accurately and reliably obtaining these is particularly challenging 
      for the NDE of high-density polyethylene (HDPE), such as is used in many water or 
      gas pipes, because the properties vary greatly with frequency, temperature, 
      direction and spatial location. Therefore the work reported here was undertaken 
      in order to establish a basis for such a multiparameter description. The approach 
      is general but the study specifically addresses HDPE and includes measured data 
      values. Applicable to any such multiparameter acoustic properties dataset is a 
      devised regression method that uses a neural network algorithm. This algorithm 
      includes constraints to respect the Kramers-Kronig causality relationship between 
      speed and attenuation of waves in a viscoelastic medium. These constrained 
      acoustic properties are fully described in a multidimensional parameter space to 
      vary with frequency, depth, temperature, and direction. The resulting 
      uncertainties in acoustic properties dependence on the above variables are better 
      than 4% and 2%, respectively, for attenuation and phase velocity and therefore 
      can prevent major defect imaging errors.
FAU - Egerton, J S
AU  - Egerton JS
AD  - Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, 
      United Kingdom.
FAU - Lowe, M J S
AU  - Lowe MJ
AD  - Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, 
      United Kingdom.
FAU - Huthwaite, P
AU  - Huthwaite P
AD  - Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, 
      United Kingdom.
FAU - Halai, H V
AU  - Halai HV
AD  - Nuclear Generation Ltd., Barnwood, Gloucester, Gloucestershire GL4 3RS, United 
      Kingdom.
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - J Acoust Soc Am
JT  - The Journal of the Acoustical Society of America
JID - 7503051
EDAT- 2017/04/05 06:00
MHDA- 2017/04/05 06:01
CRDT- 2017/04/05 06:00
PHST- 2017/04/05 06:00 [entrez]
PHST- 2017/04/05 06:00 [pubmed]
PHST- 2017/04/05 06:01 [medline]
AID - 10.1121/1.4976689 [doi]
PST - ppublish
SO  - J Acoust Soc Am. 2017 Mar;141(3):1535. doi: 10.1121/1.4976689.