e 
MATRA OPTIC 
USE OF TRASTER IN THE INDUSTRIAL FIELD 
  
It is not easy to explain what has been done with TRASTER in 
this field. 
The reason is that the only way to describe results would be to 
give the accuracy of the measurements made in the different ex- 
amples. 
Everyone knows that accuracy in this field depends on several 
factors related to the photos. 
The main factors are: 
ratio base to object distance 
scale of the object 
quality and accuracy of the control points 
type of lenses 
nature of the object itself. 
i 
1 
Of course accuracy of the instrument is important but it cannot 
be evaluated on real photos. Calibration of TRASTER is made 
with a grid. Maximum deviation using a grid known to 0.5 micro- 
meters is 2 micrometers. 
Our users have made restitution with TRASTER in very different 
applications: 
I 
aircraft deformation 
space launcher 
very deep tub for nuclear application 
smoke evaluation of nuclear centrales from normal 24x36 mm slides 
— OtO. eve ee 
1 
i 
For many of these jobs only TRASTER could give an answer. Each 
time when a comparison was possible, the results obtained with 
TRASTER were at least equivalent to those obtained with the best 
stereocomparators, and at least twice as accurate as with first 
order analogue stereoplotters 
But always the results were obtained faster than from any other 
method, and in industry, probably more than in any other field, 
TIME IS MONEY.