english version(pg40to78) - Pr. François Duret

F Duret and Coll. Principes de fonctionnement et applications techniques de l’empreinte optique dans l’exercice de cabinet
(traduction Anglaise)
Page 83
[Fig. 13: simplified representation of the inter-fringe calculation
according to the Moiré technique]
following two criteria: time (execution speed) and space (image
quality).
The research team of the Hennson Int company responsible for the
system has a double objective:
- data treatment
- a judicious structure to adapt it to the speed of execution
We have a set of values (around 70000) which we will call projection
of the studied surface according to a give direction and known
mechanical criteria. To simplify the explanation 12, 14, 18 we will report
to a primary description of the method that we have had the occasion
of describing during numerous congresses (Fig. 13).
We have β the network’s deformation profile on the tooth in relief and
δ the reference network identical to the first. The Ω value of the
fringes equations is thus calculated according to:
- I and T the optical centres spaced by b value
- the orthonormed placemarks (P, x, y, z)
- x the IT direction
- z the projection objective principal axis
- 2 wefts with δ profile orthogonally positioned to z and at F
distance of the objective’s optical centres, that is to say the
following points:
Les Cahiers de Prothèse (50) pp 73 – 110, 1985