scholarly journals Non-Contact, Non-Destructive Testing in Various Industrial Sectors with Terahertz Technology

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 712 ◽  
Author(s):  
Yu Heng Tao ◽  
Anthony J. Fitzgerald ◽  
Vincent P. Wallace
Keyword(s):  
Construction Industry ◽  
Material Characterization ◽  
Manufacturing Industry ◽  
Thickness Measurement ◽  
Thz Spectroscopy ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Industrial Sectors ◽  
Terahertz Technology ◽  
Non Destructive

In this article, we survey various non-contact, non-destructive testing methods by way of terahertz (THz) spectroscopy and imaging designed for use in various industrial sectors. A brief overview of the working principles of THz spectroscopy and imaging is provided, followed by a survey of selected applications from three industries—the building and construction industry, the energy and power industry, and the manufacturing industry. Material characterization, thickness measurement, and defect/corrosion assessment are demonstrated through the examples presented. The article concludes with a discussion of novel spectroscopy and imaging devices and techniques that are expected to accelerate industry adoption of THz systems.

Non destructive testing thickness measurement by laser ultrasound under high temperature

Optik ◽  
2018 ◽  
Vol 172 ◽  
pp. 1140-1154 ◽  
Author(s):  
Suyuan Li ◽  
Haitao Wang ◽  
Ruipeng Guo ◽  
Jiyuan Zhao ◽  
Kai Zheng ◽  
...  
Keyword(s):  
High Temperature ◽  
Thickness Measurement ◽  
Laser Ultrasound ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Non Destructive

Evaluation of near-drum thinning data in recovery boiler generating bank tubes

TAPPI Journal ◽  
2016 ◽  
Vol 15 (7) ◽  
pp. 491-500
Author(s):  
W.B.A. SANDY SHARP ◽  
W.A. BILLY JONES
Keyword(s):  
Finite Element Analysis ◽  
Thickness Measurement ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Element Analysis ◽  
Data Set ◽  
Industry Standard ◽  
Recovery Boiler ◽  
Thickness Measurements ◽  
Non Destructive

Near-drum thinning affects the fireside surface of recovery boiler generating bank tubes near the surface of the mud drum. Although sophisticated thickness scanning equipment has been developed to rapidly make tens of thousands of thickness measurements in the portion of a tube that is vulnerable to near-drum thinning, methods for using these data to evaluate fitness-for-service have not shown similar advances. Non-destructive testing companies typically use a technician’s subjective judgment to identify the “thinnest reliable" thickness measurement on each tube. Some mills decide whether tubes can continue in operation or should be plugged or replaced based on this single thickness measurement. However, finite element analysis of the remaining strength of individual tubes thinned in the near-drum area suggests that it is essentially impossible to identify the weakest tubes from simple empirical rules. In the absence of an industry standard for evaluating these data, different mills could reach different conclusions about the fitness-for-service of a tube from the same data set. This paper reviews the technology for scanning the thickness of generating bank tubes and discusses approaches that have been used to identify the tubes most weakened by near-drum thinning and to evaluate the fitness-for-service of individual tubes.

Productivity and Reliability Study of Non Destructive Testing Techniques for Inspection of Structural Welds in Construction Industry

NDT World ◽  
2016 ◽  
Vol 19 (3) ◽  
pp. 35-39
Author(s):  
Чан ◽  
Alan Chan ◽  
Бабу ◽  
Sajeesh Kumar Babu ◽  
Чан ◽  
...  
Keyword(s):  
Construction Industry ◽  
Ultrasonic Testing ◽  
Phased Array ◽  
Flaw Detection ◽  
Slag Inclusion ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Ultrasonic Techniques ◽  
Testing Techniques ◽  
Non Destructive

Introduction. The aim of this study is to evaluate the productivity and reliability of non-destructive testing techniques for the inspection of structural welds employed in the Hong Kong construction industry. Method. Manual ultrasonic pulse echo method and semi-automatic ultrasonic techniques using phased array (PAUT) as well as radiographic testing were employed. Five classes of defects were analyzed: lack of penetration, lack of fusion, crack, porosity and slag inclusion. The tests were carried out on the specimen made from structural plate, on which artefacts were inserted on the weld metal. The results were being studied to compare the defect detection reliability by both ultrasonic techniques. The flaw detection productivity using phased array is also compared with conventional ultrasonic testing at a determined rate. Results. The reliability of PAUT was 100% compared to 96.7% with manual ultrasonic testing, however with the inclusion of defect sizing and tolerance the reliability of manual UT is dropped to 57.4%, which implies there is a chance of 42.6% of improper sizing). PAUT exhibits the reliability of 87.5%. The research will be continued with the aim of determining the most appropriate and reliable NDT methods in each case.

Impurity detection in polymer parts for the semiconductor manufacturing industry

2018 ◽  
Vol 85 (11) ◽  
pp. 700-712
Author(s):  
T. Moldaschl ◽  
T. Arnold ◽  
M. Zauner ◽  
S. Meislitzer ◽  
D. Obersteiner ◽  
...  
Keyword(s):  
Semiconductor Manufacturing ◽  
Manufacturing Industry ◽  
Detailed Knowledge ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Production Chain ◽  
Processing Step ◽  
Testing Techniques ◽  
Non Destructive ◽  
Laboratory Demonstrator

Abstract The very strict purity requirements of polymer parts that are used in the semiconductor manufacturing industry lead to an excessively low yield rate. To decrease the costs in the production chain, detailed knowledge about possible impurities during each processing step is essential. This work provides an overview of non-destructive testing techniques that are capable of either detecting or even identifying these impurities. The most promising techniques were then combined in a semi-automatized laboratory demonstrator that can be used as an in-line diagnostics tool to prevent processing of faulty parts. Results from these measurements are presented and discussed.

scholarly journals Terahertz based non-destructive testing (NDT)

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Dirk Nüßler ◽  
Joachim Jonuscheit
Keyword(s):  
New Technology ◽  
Industrial Applications ◽  
X Rays ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Reinforced Plastics ◽  
Hollow Structures ◽  
Terahertz Technology ◽  
Non Destructive ◽  
Made In

AbstractEstablished methods based on X-rays, ultrasound, thermography, eddy current, and optics are very effective in fault detection and structural analysis. However, these methods are limited for some applications, for example, the non-destructive testing of fiber-reinforced plastics, foams, and sandwich or hollow structures. In these cases, terahertz technology offers an innovative method to overcome these limitations. Tremendous advances have been made in this new technology in terms of their industrialization in recent years. This paper presents techniques for use in industrial applications.

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