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Ultrasonic Testing (UT) is a widely used Nondestructive Testing (NDT) Method
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|This Month's Introduction|
The first two articles can be used as thickness gauging tutorials.
Besides more Ultrasonic articles, we'er pleased to publish a Digital Radiography method for Wall Thickness Determination.
And we have started the new
We'll also focus on NDT of Ceramics -
All Abstracts from the Symposium on NDE of Ceramics at the American Cermic Society Meeting in May '97.
Of special interest is "Ultrasonic testing of green ceramic materials,"
available in English or German, lecture from the DGZfP Conference in May 97.
One of the thickness articles addresses application to imaging techniques to ceramic materials properties.
You'll also find "Refining automated ultrasonic inspections with simulation models".
This is a big paper, but give it time to load - it's worth it!
Survey Result of 'How are NDT manufacturers doing'
The survey shows some very interesting figures. Six of 50 users won spots in our drawing for a free CD-ROM.
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Please fill out this survey. Plus, you could win a UT'96 CD-ROM.
|NDT - Method|
This Month's Articles
Theory and Applications of Precision Ultrasonic Thickness Gaging|
This paper summarizes some of the major aspects of precision ultrasonic thickness gauging. Ultrasonic nondestructive testing (NDT) characterizing material thickness, integrity, or other physical properties by means of high-frequency sound waves has become a widely used technique for quality control. In thickness gauging, ultrasonic techniques permit quick and reliable measurement of thickness without requiring access to both sides of a part.
By Kenneth A. Fowler, Gerry M. Elfbaum, Karen A. Smith and Thomas J. Nelligan, Panametrics NDT Division USA
On Resolution, Accuracy and Calibration of Digital Ultrasonic Thickness Gauges|
The difference between resolution and accuracy is highlighted with respect to ultrasonic thickness gauges. After briefly describing the principles of operation, sources of errors are discussed, and where possible quantified. It is shown that calibration to national standards has no place in this field. It is concluded that while the thickness gauge is a valuable tool for routine inspection, the accuracy of its readings should not be accepted with unquestioning faith.
Peter Hammond, Cygnus Instruments Ltd
Thickness Measurement in Materials of Unknown Acoustic Velocity |
This presentation will concentrate on thickness measurement applications. Conventionally, a calibration sample of the exact material to be measured is constructed. The thickness of this sample is measured precisely, as is the time of flight of an acoustic pulse through the part thickness. From this information, the acoustic velocity of the material can be computed. Subsequent time of flight measurements can be interpreted in terms of thickness if we assume that the acoustic velocity is identical to that of the calibration sample.
By Thomas J. Carodiskey and Paul A. Meyer Krautkramer Branson Lewistown, PA USA
See also: White, Dennis A., "Ultrasonic Thickness Measuring Apparatus and Method", United States Patent #4,398,421.
Thickness-Independent Ultrasonic Imaging apllied to Ceramic Materials |
A single transducer ultrasonic imaging method that eliminates the effect of thickness variation in the image, and its application to plate and hollow tubular ceramic materials, are described. The thickness-independent ultrasonic imaging method is shown to provide more accurate and quantitative materials characterization as compared to that for conventional ultrasonic c-scan and apparent velocity images.
By Don J. Roth, Dorothy V. Carney NASA Lewis Research Center
See also: ROTH Don J., "Pulse-echo ultrasonic imaging method for eliminating sample thickness variation effects", United States Patent #5,629,865
|Wall Thickness Determination in Digital Radiography|
A software for interactive estimation of wall-thicknesses from digitised X-ray films is presented and its possible field of application is discussed. Both wall-thickness estimation from film density variation and edge projections are shown. A brief comparison to imaging plates is given.
By T. Wawrzinek, U. Zscherpel, C. Bellon, BAM - Berlin
Q & A - Thickness Gauging, Level 1 - 2 - 3 |
Interactive Quiz, R. Diederichs
86 Pantents on Ultrasonic Thickness Measurement|
We searched Patent Databases and found 86 patents in 1976- 1997 for the serach criteria 'Abstract: ultrasonic and Title: thickness'.
|Hundrets of links of Ultrasonic Thickness Measurement* on the Internet|
If you want to find commercial information for buying thickness gauges, the Internet Search Engines turn out many results. Many links pointed to UTonline, however, other technical information was very difficult to to find among those hundreds of links. Nevertheless after a full day's work and using booelan search criteria we found some useful information on the subject. As usual, while surfing the Net we found some other interesting things also - but that will be another story.
*Note: We searched also for "fuzzy matches": gauging or gaging.
Ultrasonic Thickness Measurement on NDTnet |
We searched NDTnet and found more than 100 results for the serach criteria 'ultrasonic and thickness'. Here are the most relevant articles, abstracts, UTonline encyclopedia and news.
| NDT of Ceramic
Ultrasonic testing of green ceramic materials [D]|
The aim of this research is an ultrasonic areascan of green ceramic bodies. First results of combinations of different coupling techniques will be discussed.
By Tietz, May, Dietz, Bühling Westsächsische Hochschule Zwickau (FH)
54 Abstracts of NDE of Ceramics |
The Symposium on Nondestructive Evaluation of Ceramics at the American Ceramic Society 99th Annual Meeting, '97 May 4-7, Cincinnati, Ohio
| Ultrasonic Inspection with simulation models
Refining automated ultrasonic inspections with simulation models |
One important motivation for using an ultrasonic simulation model is the relatively low cost of software predictions compared to the cost of comparable experiments. A software package, UTSIM, has been created that can simulate ultrasonic measurements. A particular capability of this package, namely simulating and refining inspection scan plans, has been described in detail. Three examples were shown. The capability to quantitatively determine and refine the coverage of a scan is believed to be unique to this software. The software is applicable to most ultrasonic inspections. It is particularly useful for unusual probes and/or complex geometries where the field propagates in the least intuitive ways. Ultrasonic researchers at CNDE assisted with this work which was supported by NIST. This paper was originally presented as a Thesis for a Master of Science degree at Iowa State University.
By Michael Garton IOWA
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|NDTnet News - Market - Technology||
News Archive '97
News Archive '96
15 Ultrasonic Patents |
We retrieved some recent Patents through the Micropatent Patent Database.
A very fast method to determine total wall thickness of a pipe that has process fluid inside
Database of Thickness Measurement Applications
Digital Ultrasonic Thickness Gauges for Non-Destructive Testing of metal
QMSystems has also introduced a line of microprocessor based hand-held ultrasonic thickness gages
Preform Thickness Gauge PTG5000
A Tank Crawler System collects ultrasonic thickness readings.
You can submit your Web Page for the NDTnet '97 CD-ROM
Rolf Diederichs' Newspaper Interview: "Auch im Internet gibt es Ländergrenzen" [German]
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