Patent ID: 6060720
Filing Date: 2000-05-09
Classification: G01N,G02B

Abstract:
A method of determining the linear position on a first lenticular screen, by using a reference lenticular screen, said screens being arranged parallel to each other with each screen having a plane surface and a convex surface and a principal focal plane and having a plurality of lenticules of similar pitch with longitudinal axes which are parallel to each other, comprising the steps of:a) directing a collimated beam of radiation perpendicularly into one lenticular screen;b) allowing the beam transmitted by said one lenticular screen to enter another lenticular screen, with said lenticular screens being spaced in relationship to each other so as to recollimate the radiation beam upon exit from the other sheet;c) receiving the recollimated beam exiting from the other lenticular screen on a radiation detector which subtends the field-of-view of the lenticules in the other screen; andd) displacing the lenticular screens relative to each other in a linear direction while sensing the position of the recollimated beam exiting the other screen and calculating the number of lenticules and fractions of lenticules being displaced utilizing the detector array and utilizing means for making such computation.