Interferogram synthesization method and apparatus
US4238827A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1978 |
| Grant date | Dec 9, 1980 |
| Priority date | — |
| Expiry date | Nov 20, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Real time presentation and evaluation of any selected interferogram is realized by electronically simulating optical aberration patterns and displaying them on a cathode ray tube (CRT). The optical aberration patterns include PISTON; X and Y TILT; DEFOCUS; SPHERICAL; COMA; and ASTIGMATISM. The aberration patterns are generated electronically in response to the CRT beam sweep drive signal and are displayed as a function of CRT beam intensity. Any combination of aberration patterns, each having selectable coefficients, can be displayed. The aberration pattern coefficient values are indicated by a digital readout. Evaluation of an unknown interferogram is accomplished by varying aberration pattern combinations and coefficients until a substantial match with the unknown interferogram is achieved. The contributing aberration patterns are then known and their magnitudes are determined from the digital read-out.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.