Initial Outline for NDT in the Digital Age Seminar
Below is the initial attempt at an outline for a one day seminar being planned for the Fall. Any comments, suggestions for additions or subtractions or ideas for fleshing out the details would be greatly appreciated.
Thanks for your kind and thoughtful considerations in this venture.
Matt Golis ----------------------------------- NDT in the Digital Age
A Post Conference Tutorial Seminar
October 19, 2001
Following the Fall ASNT Conference in Columbus, OH
This all-day seminar addresses the changes and their consequences resulting from the recent digitization of nondestructive testing equipment used in materials testing and characterization. It covers impacts seen in the major modes of NDT, with an emphasis on how the technical effectiveness of NDT has been altered in recent years.
1. Introduction and Overview
Historical Evolution NDT is an extension of our human senses (analog) Our human capabilities and limitations Digital systems lead to better quantification and enhanced functionality Signal processing and interpretation Data storage for reference, archive, selective analysis
NDT Methods Affected Large Impact - RT, UT, ET, ??? Medium Impact - Thermal, VT, ??? Little Impact - MT, PT, LT, ???
2. The Changes in Language
Analog vs. Digital Lexicon
Changes in Benchmarks - What should we be looking for?
3. Hardware Issues
Sensors - A/D conversion vs. direct digital (arrays, others?)
Individual Signals - (stream of information from a FIXED position) Preprocessing - Analog - Amplifiers, film Digital - ???
Processing - Analog - Filters, Electronic DAC, rf vs. video, demodulators Digital - ??
Display - (A-Scan) Analog - CRT or simple meter Digital - LCD, ???
Display - (B-, C-,other Scan) Analog - plotter Digital - LCD
Interpretation Analog - visual estimates (dimensions), gain sensitive, gates Digital - visual estimates (dimensions) with precise lookups??, Supplemental interpretation of a broad range of stored data (dimensions, time of arrival, histograms of relative presence, neural nets, spectral content, ??? etc.)
4. Software Issues
Operating Systems ?? Data Handling - storage, transfer, formats, compression/extraction, ??? Data Analysis - FFT, filtering, transfer functions, pattern recognition, neural nets, statistics, POD/ROC, modeling, ??? Data Display - 1D, 2D, 3D, Other ???
5. System and Performance Comparisons
Analog vs. Digital Comparisons for the major NDT methods/techniques
Characteristics of interest - dynamic range, sensitivity, noise, transfer functions, frequency response, linearity, calibration, maintenance, longevity, resolution, contrast, latitude, focus (camera), timing issues (finger damping), hazardous materials, enlargements, initial costs, operating costs, special effects, ???, ???, ???
(Tables, charts, summary sheets are expected to be presented)
6. Case Studies
Featuring specific situations, options, costs, with an emphasis on what was the advantage (or loss) of going digital? Special emphasis should be placed on NDT performance (improved detection and reliability) vs. Cost and/or Logistics enhancements.
Cases to be addressed (1 or 2 for each method)
X-ray - images & devices UT - images & equipment ET - images & equipment Thermal - images & equipment Other - TBD
7. The COMPLAINTS, How are we doing with These?
Hard to use (no knobs, not intuitive, slow,) Limits of electronics (cooling of processor, bus speed, aliasing, mother board changes, ramp up/down, index, digitizers, data dropout, digitizer vs. frequency of carrier, PC vs. dedicated device, ???) Maintenance (replace, change software, upgrades, jam cards, ???) Connectivity (compatibility, standardization, ???)
8. What Does the Future Hold?
"The land of Blue Sky ideas and activities"
9. Open Panel Discussion of Analog vs. Digital in NDT's Digital Age
09:32 Dec-22-2000 Rolf Diederichs Director, Editor, Publisher, Internet, PHP MySQL NDT.net, Germany, Joined Nov 1998 602
Re: Initial Outline for NDT in the Digital Age Seminar I think that a good topic could be how Standards recognize the digital age. A review of new "digital standards" or in progress could be interesting.
Re: Initial Outline for NDT in the Digital Age Seminar es for analog equipment. Perhaps the situation isn't as straightforward in NDT disciplines other than ultrasonics, but in UT at least there should be no confusion or ambiguity.
Re: Initial Outline for NDT in the Digital Age Seminar st is to verify functionality and setup on test blocks or other reference standards before taking data.
: None of this, except the digital self-test, is fundamentally different from the established procedures for analog equipment. Perhaps the situation isn't as straightforward in NDT disciplines other than ultrasonics, but in UT at least there should be no confusion or ambiguity.