Optical transducer element and displacement meter comprising suc

Details Optical transducer element and displacement meter comprising suc Optical transducer element and displacement meter comprising suc

1986-10-01

1988-05-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 340347P, G01D 534

Patent

active

047467924

ABSTRACT:
Displacement of an object is sensed by a transducer element having light first strips and dark second strips alternating in a direction of object displacement. The first strips are formed as phase gratings having grating lines extending in the direction of displacement and having a width equal to half the grating period and a depth such that the zero-order diffraction beam is suppressed. The lines may be grooves or ribs, separated by lands which are at the same level as the second strips. A device, for measuring displacement of an object on which such an element is fixed, includes an imaging system having an aperture limited such that first and higher-order diffraction beams from the phase grating are not transmitted to a radiation-sensitive pattern detection system.

REFERENCES:
patent: 4528448 (1985-07-01), Doggett
patent: 4577101 (1986-03-01), Bremer et al.

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