US3790285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scattered light polariscope
Assignee: HARMON WHITE ASS Inc
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Filing: 1971-07-19
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Granted: 1974-02-05
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Expires: 1991-07-19
Abstract
Abstract A photoelastic model is fixedly positioned in a body of fluid within an octagonal tank. The planar sides of the tank are provided with windows and the tank is supported for angular movement about a vertical axis relative to the model until desired fringe patterns are visible through one or more of the windows. Laser or polarized light beams scattered or transmitted by the model produce the fringe patterns for analysis of the model under different operational modes.
Inventors
- 👤 W Swinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:26
CPC Classifications
G; G01; G01L; G01L1/00; G01L1/24; G01L1/241
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
21 words
The method of claim 1 wherein said enclosure is angularly adjusted about a rotational axis parallel to the beam of light.
Claim 2
Dependent Claim
19 words
The method of claim 2 wherein said line of observation corresponds to the location of maximum fringe pattern density.
Claim 3
Dependent Claim
38 words
The method of claim 3 including the step of: recording an image of the fringe pattern visible through another of said faces of the enclosure adjacent to said one of the faces intersected by the line of observation.
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein said line of observation corresponds to the location of maximum fringe pattern density.
Claim 5
Dependent Claim
38 words
The method of claim 1 including the step of: recording an image of the fringe pattern visible through another of said faces of the enclosure adjacent to said one of the faces intersected by the line of observation.
Claim 6
Dependent Claim
36 words
The method of claim 1 including the step of transmitting light through the model along an optical axis in a plane common to the line of observation and perpendicular to the plane of stress being examined.
Claim 7
Dependent Claim
21 words
The method of claim 7 wherein said line of observation is aligned at a predetermined angle to the plane of stress.
Claim 8
Dependent Claim
162 words
Apparatus for analyzing a photoelastic model under load having birefringent characteristics when exposed to a light beam, comprising means for fixeDly positioning said model, a source of light scattered by said fixedly positioned model, an enclosure containing a body of fluid having an index of refraction compatible with that of the model, means for supporting the enclosure with the fixedly positioned model suspended within the body of fluid to produce scattered light fringe patterns, light transmissive means having planar faces mounted by the enclosure for viewing the fringe patterns from a plurality of angularly spaced locations, means for angularly adjusting the enclosure relative to the fixedly positioned model, means transmitting the light beam from the source to the model along an axis parallel to said faces for producing a maximum fringe pattern density visible through one of said planar faces at one of said angularly spaced locations 45* from the other of the locations on the principal stress axis of the model.
Claim 9
Dependent Claim
22 words
The combination of claim 9 including camera means for recording an image of the fringe pattern at said other of the locations.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |