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US5124542A
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Method for quantitatively determining petal piston in a segmented imaging assembly
Assignee: Eastman Kodak Co
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Filing: 1990-11-30
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Granted: 1992-06-23
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Expires: 2010-11-30
Abstract
Abstract A method suitable for determining piston in a segmented imaging assembly. The assembly preferably comprises a source of radiation that outputs a radiation beam; and, a segmented imaging system comprising a reference component and a test component, which components can be used to form an imaged radiation beam. The method comprises the steps of intercepting preselected portions of the imaged radiation beam with a mask, for masking at least one portion of at least one of the reference component and the test component, so that a portion of the imaged radiation beam incurs a predetermined and differential phase retardation, relative to another portion of the beam passing through the mask. These actions create a real time masked image. A step of comparing the real time masked image against a family of off-line images generated for a sequence of known petal position errors, can provide a determination of the magnitude of the real time test component piston.
Inventors
- 👤 Alan L. Wertheimer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:29
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/14; G02; G02B; G02B26/00; G02B26/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
158 words
A method suitable for determining piston in a segmented imaging assembly, the assembly comprising (a) a source of radiation that can output a radiation beam; and (b) a segmented imaging system comprising a reference component and a test component, which components can be used to form an imaged radiation beam; the steps of the method of the present invention comprising: 1) intercepting preselected portions of the imaged radiation beam with a mask; 2) masking at least one portion of at least one of the reference component and the test component, so that a portion of the imaged radiation beam incurs a predetermined and differential phase retardation relative to another portion of the beam passing through the mask, thereby creating a real time masked image; and 3) comparing the real time masked image against a family of off-line images generated for a sequence of known petal position errors, for determining the magnitude of the real time test component piston.
Claim 2
Independent Claim
158 words
A method suitable for determining piston in a segmented imaging assembly, the assembly comprising (a) a source of radiation that can output a radiation beam; and (b) a segmented imaging system comprising a reference component and a test component, which components can be used to form an imaged radiation beam; the steps of the method of the present invention comprising: 1) intercepting preselected portions of the imaged radiation beam with a mask; 2) masking at least one portion of at least one of the reference component and the test component, so that a portion of the imaged radiation beam incurs a predetermined and differential phase retardation relative to another portion of the beam passing through the mask, thereby creating a real time masked image; and 3) comparing the real time masked image against a family of off-line images generated for a sequence of known petal position errors, for determining the magnitude of the real time test component piston.
Claim 3
Dependent Claim
24 words
A method according to claim 1, comprising intercepting the imaged radiation in a region substantially at a conjugate image plane of the reference component.
Claim 4
Dependent Claim
63 words
A method according to claim 1, wherein step 3 comprises: (i) transforming the real time masked image into a corresponding point spread function; (ii) transforming the family of off-line images into corresponding point spread functions; and (iii) comparing the point spread function (i) against the family of off-line point spread functions (ii), for determining the magnitude of the real time test component piston.
Claim 5
Dependent Claim
29 words
A method according to claim 1, in which the phase delay of the masking step 2 is approximately one-half wave of optical path difference of the source of radiation.
Claim 6
Dependent Claim
27 words
A method according to claim 1, in which the masking step 2 comprises masking the entire extent of at least one of the reference and test components.
Claim 7
Dependent Claim
41 words
A method according to claim 3, wherein the masking step 2 comprises introducing a phase retardation for generating the family of off-line point spread functions, so that the PSF are characterized by predominant intensity side-lobes in the vicinity of zero piston.
Claim 8
Dependent Claim
24 words
A method according to claim 6, comprising the step of generating a PSF intensity ratio curve from the family of off-line point spread functions.
Claim 9
Dependent Claim
34 words
A method according to claim 7, comprising mapping a real time masked image point spread function intensity to the intensity ratio curve, for quantitatively determining the magnitude of the real time test component piston.
References Cited (Backward Citations)
US4725138A
Cited
US5017004A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-23 | 1995-12-23 | 1996-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-23 | 1999-12-23 | 2000-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-23 | 2003-12-23 | 2004-06-23 | $7700.00 | Window Closed / Lapsed |