US4087746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for determination of optical anisotropy of dielectric material by microwave
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1976-11-19
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Granted: 1978-05-02
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Expires: 1996-11-19
Abstract
Abstract Disclosed is a method for the determination of the optical anisotropy of a dielectric material such as fibrous glass-reinforced plastic resin, particularly the measurement of the state in which reinforcing fibers present in the dielectric material are oriented, by using a microwave characterized by connecting a fixed quarter-wave plate and a rotary quarter-wave plate to a conventional reflective type microwave measuring device in front of which the dielectric material is disposed, whereby the ratio of amplitude and the phase difference which represent the degree of anisotropy of the dielectric material can be determined.
Inventors
- 👤 Yoshioki Kanae
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:13
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R27/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
A method for the determination of the optical anisotropy of a dielectric material by means of a microwave, which method comprises producing a linearly polarized microwave by means of a microwave generator, converting said linearly polarized microwave into a circularly polarized wave with a fixed quarter-wave plate, causing said circularly polarized wave to impinge in the form of a linearly polarized wave upon a test specimen by means of a rotary quarter-wave plate, adjusting said plate in inclination so as to bring the inclination thereof into perfect agreement with the inclination of the major axis of an elliptically polarized wave generated during its passage through the test specimen for thereby converting said elliptically polarized wave into a resultant linearly polarized wave, measuring standing waves in two components of the linearly polarized waves, and consequently determining the inclination and the ellipticity of said elliptically polarized wave thereof on the basis of the measurement of the standing waves and the angle of said rotary quarter-wave plate.
Claim 2
Independent Claim
164 words
A method for the determination of the optical anisotropy of a dielectric material by means of a microwave, which method comprises producing a linearly polarized microwave by means of a microwave generator, converting said linearly polarized microwave into a circularly polarized wave with a fixed quarter-wave plate, causing said circularly polarized wave to impinge in the form of a linearly polarized wave upon a test specimen by means of a rotary quarter-wave plate, adjusting said plate in inclination so as to bring the inclination thereof into perfect agreement with the inclination of the major axis of an elliptically polarized wave generated during its passage through the test specimen for thereby converting said elliptically polarized wave into a resultant linearly polarized wave, measuring standing waves in two components of the linearly polarized waves, and consequently determining the inclination and the ellipticity of said elliptically polarized wave thereof on the basis of the measurement of the standing waves and the angle of said rotary quarter-wave plate.
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) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |