US3861804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inferometry readout of phase information
Assignee: Xerox Corp
•
Filing: 1973-02-26
•
Granted: 1975-01-21
•
Expires: 1993-02-26
Abstract
Abstract Phase information recorded in the form of thickness or refractive index variations in a transparent member is detected by directing converging, temporally coherent light onto the transparent member. The intensity of the interfering light reflected from the top and bottom of the transparent member provides a direct readout of thickness or refractive index for the discrete area examined. The intensity variations of the interfering light observed during a scan of the transparent member provide information about the magnitude of the thickness or refractive index changes recorded by the member.
Inventors
- 👤 Donald R Lehmbeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:56
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/41; G01N21/45; G01J; G01J9/00; G01J9/02; G01N21/84; G01N21/8422; H; H04; H04N; H04N5/00; H04N5/76; H04N5/80; H04N5/82
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
156 words
Apparatus to detect and record variations in the optical thickness of an extended phase object, including: a source of temporally coherent light, optical means to direct said light onto a phase object and to image the reflections of said light from said object, a first electric motor operatively connected to said optical means to reciprocate the same in an X direction, a second electric motor operatively connected to said optical means to reciprocate the same in a Y direction, an electrical photodetector in optical communication with said image of said object and responsive to intensity variations thereof to generate intensity signals, a recorder operatively connected to said photodetector, said first motor, and said second motor to record intensity signals from said photodetector and position signals from said motors, and a visual display device operatively connected to said recorder to convert electrical signals from said recorder to a visible two dimensional contour representation of said phase object.
Claim 2
Dependent Claim
156 words
Apparatus to detect and record variations in the optical thickness of an extended phase object, including: a source of temporally coherent light, optical means to direct said light onto a phase object and to image the reflections of said light from said object, a first electric motor operatively connected to said optical means to reciprocate the same in an X direction, a second electric motor operatively connected to said optical means to reciprocate the same in a Y direction, an electrical photodetector in optical communication with said image of said object and responsive to intensity variations thereof to generate intensity signals, a recorder operatively connected to said photodetector, said first motor, and said second motor to record intensity signals from said photodetector and position signals from said motors, and a visual display device operatively connected to said recorder to convert electrical signals from said recorder to a visible two dimensional contour representation of said phase object.
Claim 3
Dependent Claim
29 words
Apparatus as defined in claim 1 including means to control the speed of output of said recorder so as to render the display on said visual display device adjustable.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |