DEVELOPMENT OF THE NEW GDV DEVICES

The recommended way of measurements is as follows:

  1. Prepare the GDV installation.
  2. Take 6 BEOgrams using GDV Grabber.
  3. Save them in a folder.
  4. Load 6 BEOgrams into GDV Processor.
  5. Process BEOgrams with Processor settings 30/250.
  6. In case of a lot of "noise" process again with Processor Settings 50/250 or 70/250.
  7. = The level of "noise" will by calculated as BEa parameter.
  8. If necessary, remove "noise" by rubber.
  9. Calculate parameters by Analysis/Parametric Analysis.
  10. Save parameters in a *.txt file using File/Save Data option.
  11. Calculate and save a set of parameters in GDV Processor Analysis/Framework. See description in the Manual.
  12. Load calculated parameters into "MS Excel" program or the like.
  13. = To open *.txt or *.ent files click File Types: All Files.
  14. = In … /Regional Setting/… should be dot (?), but not a comma (‚).
  15. Calculate averages and dispersions for all data and parameters.
  16. Make statistical processing using discriminative and group analysis
    [see for example: Glantz S. Primer of Biostatistics. McGraw-Hill, 1994].
  17. Simple analysis may be done by comparison of Averaged Parameters for different samples of water to find whether the difference for the particular parameter of different samples is statistically bigger than the dispersions.
  18. Repeat the procedure several times to get statistical difference.
  19. Choose for comparison the most sensitive parameters. Sometimes it make sense using complex parameter as a sum or multiple of same parameters.
  20. The Range and Exposure of the GDV Camera depend on the sample under test. The most common Range = 2 ÷ 3, Exposure = 1.
  21. Interesting results may be obtained using *.AVI files.

NB!

  1. GDV Camera should be warmed up by switching on at least for 15 min before the measurements.
  2. GDV Technique is very sensitive in measuring difference between water samples, but this should be done very carefully. At the moment reliability of the technique depends to big extend on the skill of operator. Before using GDV technique for the "real" measurements, train on the samples of distilled water to get repeatability not less than 4-5%.
  3. Keep GDV lens clean.
  4. Technique is designed for testing water samples, other liquids may be tested on your own responsibility. Be careful with flammable liquids.
  5. As there are slight variations in GDV parameters from day to day, use distilled water or metal test-object as a reference.
  6. Check that water does not drop down or splash. Readings may differ due to these factors.
  7. GDV water testing needs very precise attitude.
  8. You may use syringes and tubes for a lot of water samples cleaning it with distilled water several times. For blood, oil, etc., samples they should be used one time only

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