Apparatus for producing phase-shifted electric signals
Abstract
Abstract IN APPARATUS FOR PRODUCING PHASE-SHIFTED ELECTRIC SIGNALS REPRESENTING THE POSITIONS OF A MOVING ELEMENT, LIGHT FROM A SOURCE PASSES THROUGH SIMILAR FIRST AND SECOND GRATINGS, AT LEAST ONE OF WHICH MOVES BACK AND FORTH IN LINE WITH THE DIRECTION OF THE WIDTHS OF THE GRATING SLITS IN CORRESPONDENCE WITH MOVEMENTS OF THE MOVING ELEMENT, AND THROUGH A LENS THAT FOCUSSES THE RESULTING DIFFRACTION IMAGE ON A ROW OF PHOTOELECTRIC RECEIVERS IN THE FOCAL PLANE OF THE LENS. THE SECOND GRATING IS SPACED FROM THE FIRST GRATING (I.E., THE GRATING ITSELF OR ITS PROJECTED IMAGE). THE DISTANCE A BETWEEN PROJECTIONS OF THE CENTERS OF THE RECEIVERS ON A REFERENCE LINE WHICH IS AT RIGHT ANGLES TO THE DIRECTION OF THE LENGTHS OF THE GRATING SLITS IS WHERE W IS PERIOD LENGTH OF THE GRATING SLITS, Z IS THE LENGTH OF THE OPTICAL PATH FROM THE FIRST GRATING ( THE GRATING ITSELF OR ITS PROJECTED IMAGE) TO THE SECOND GRATING, F IS THE FOCAL LENGTH OF THE LENS, AND 0 IS THE DESIRED PHASE SHIFT OF SIGNALS PRODUCED BY THE PHOTOELECTRIC RECEIVERS, AS MEASURED IN RADIANS.
Inventors
- 👤 Adolf Weyrauch
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |