Non-contact optical measuring probe
Abstract
Abstract D R A W I N G A LIGHT BEAM IS PASSED THROUGH A PINHOLE AND FOCUSED ON THE SURFACE OF AN OBJECT. A COLOR DISPERSING PLATE PROVIDES DIFFERENT WAVELENGTH COMPONENTS SO THAT THE ILLUMINATION OF ONE COLOR LONG WAVELENGTH IS FOCUSED AT A GREATER DISTANCE THAN THE AVERAGE AND THE SHORT WAVELENGTH COMPONENTS ARE FOCUSED AT A SHORTER DISTANCE. THE REFLECTIONS FROM THE SURFACE ARE RETURNED THROUGH THE SAME LENS AND BEAM SPLITTERS TO TWO DETECTORS. ONE DETECTOR IS FILTERED TO PASS THE SHORT WAVELENGTH AND THE OTHER DETECTOR IS FILTERED TO PASS THE LONG WAVELENGTH. THE DETECTOR OUTPUTS ARE THEN COMPARED. IN A SECOND EMBODIMENT, THE PINHOLE IS OSCILLATED TO CHANGE THE FOCAL LENGTH OF THE BEAM. ONLY ONE DETECTOR IS USED AND THE DETECTOR OUTPUT IS COMPARED IN PHASE WITH THE OSCILLATION VOLTAGE.
Inventors
- 👤 Anwar K Chitayat
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |