1978 ISP COMMISSION V INTER-CONGRESS SYMPOSIUM - STOCKHOLM SWEDEN 
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Gates: (Chairman of the Session) 
Good morning ladies and gentlemen. I think we should make a start now. 
People have come in, in spite of the change in the weather. This session 
is on non-conventional imaging systems, as may be of relevance in the field 
of photogrammetry. We have quite a numbet of papers of diverse interest, 
in the course of the two sessions this morning. The first series of papers 
is concerned with a number of aspects of photogrammetric interferometry and 
holographic measurement. Then there is a paper by Dr. Gutu on the use of 
industrial photogrammetry in the investigation of technological mining 
engineering, with a novel projective technique. After the interval there 
will be papers relating toX-ray and diffraction electron optics. We will 
finish the discussion with the consideration of the prospects for the par- 
ticipation of this group in the international congress in Hamburg in 1980. 
Before I knew that I was going to be chairman of this session I had pre- 
pared a review of some topics we have been studying at the National Phy- 
sical Laboratory in Teddington, in England, and I am going to exercise 
my chairman's privilege unfairly and allow myself to give the first paper. 
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Paper by J.W.C. Gates - National Physical Laboratory - England 
"PHOTOGRAMMETRY AND OPTICAL METROLOGY" 
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Discussion of the above paper 
Derrington: Is there any practical limit to the actual size of the dis- 
placement you can measure by this fringe counting? 
Gates: Yes, of course. The sensitivity of the measurement depends on the 
technique used and ultimately on the wavelength of light. In some methods 
of measurement like those described in Sections 1 and 2 of the paper the 
limit of uncertainty may be as small as a fraction of a wavelenth, but the 
range of displacements recorded would be relatively small. In the tech- 
niques described in the later sections the size of field covered and the 
range of displacements measurable may be greatly increased, at the expense 
of sensitivity. For example, the displacements in the 10 m wide brick 
arch (Section 4) may be measured to a small fraction of a millimeter. 
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Paper by R. Pryputniewicz - The University of Connecticut 
"HOLOGRAPHIC ANALYSIS OF AIRFOILS" 
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Discussion of the above paper 
  
Doyle: What exactly are the observations or measurements which you make 
in order to enter them into your equations, and how are these measurements 
made? 
Pryputniewicz: We measure the fringe shifts, that is we do not have to 
determine absolute fringe fractions at a given point, for a given obser- 
vation. All we have to know is the direction of observation displacements, 
and the direction of observation is, as I pointed out, defined by a point