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- since 1996 -

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Technical Discussions
Matt Golis
Matt Golis
00:15 Dec-21-2000
Initial Outline for NDT in the Digital Age Seminar

To All:

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

PURPOSE

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.

OUTLINE

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, ???

Interpretation
Analog - visual estimates (amp & time), shape assessments, gates ?
Digital - precise lookups? (amp & time), gates, ??

Set of Scanned Signals

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

Q&A 'til we drop



    
 
 
Rolf Diederichs
Director,
NDT.net, Germany, Joined Nov 1998, 604

Rolf Diederichs

Director,
NDT.net,
Germany,
Joined Nov 1998
604
09:32 Dec-22-2000
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.

Rolf


    
 
 
Matt Golis
Matt Golis
06:50 Dec-22-2000
Re: Initial Outline for NDT in the Digital Age Seminar



    
 
 
Tom Nelligan
Engineering,
retired, USA, Joined Nov 1998, 390

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
07:46 Dec-22-2000
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.



    
 
 
Matt Golis
Matt Golis
08:24 Dec-22-2000
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.




    
 
 

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