Photogrammetric measuring system

Details Photogrammetric measuring system Photogrammetric measuring system

G - Physics

01

B

33/48

G01B 11/00 (2006.01) G01B 11/02 (2006.01) G01C 11/04 (2006.01)

Patent

CA 1154585

E780 CAN ABSTRACT An electro-optical measuring system in a photogrammetric comparator or stereocompiler comprises a visible light transparent phase grating which is carried upon a surface of the photo support plate of the device. The grating is formed as a composite layer of .lambda./4 films of at least two dielectric materials of different refractive index which are deposited on the support in such a manner as to yield parallel bands in which the two film materials are in alter- nating sequence from band to band. As a result of this structure which ensures a constant physical and optical thickness with respect to transmitted imaging light over the whole grating pattern, image-degrading diffraction of the trans- mitted visible light is avoided, yet the grating pattern provides interfering diffraction in reflection which may be utilized in a precise displacement measuring system. - 16 -

382651

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