US5011279A
Expired / Lapsed
US
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Fiber-optical sensor
Assignee: BASF SE
•
Filing: 1988-06-10
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Granted: 1991-04-30
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Expires: 2008-06-10
Abstract
Abstract In a fiber-optical sensor used for measuring the Doppler broadening of scattered laser light by the principle of quasi-elastic light scattering (QELS), the scattered light originating from particles in movement, the emergence surface (7) for the laser light at the end of a single-mode or multimode light guide (3) used as an immersion probe is inclined at an angle 0<φ≦15°, preferably 1°≦φ≦6°, the angle of inclination being de-fined by the optical axis (8) of the light guide (3) and the normal (9) of the emergence surface (7).
Inventors
- 👤 Helmut Auweter
- 👤 Dieter Horn
- 👤 Dieter Lilge
- 👤 Juergen Wortmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:29
CPC Classifications
G; G01; G01P; G01P5/00; G01P5/26; G01F; G01F1/00; G01F1/66; G01F1/661; G01N; G01N21/00; G01N21/17; G01N21/47; G01N21/49; G01N21/51; G01J; G01J3/00; G01J3/28; G01J3/44; G01J3/4406; G01N15/00; G01N15/02; G01N15/0205; G01N15/0211; G01N2015/0222; G01N2021/4704; G01N2021/4709; G01N21/84; G01N21/85; G01N21/8507; G01N2201/00; G01N2201/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
138 words
A fiber-optical sensor for measuring the Doppler broadening of scattered laser light by the principle of quasi-elastic light scattering (QELS) , the scattered light originating from scattering of laser light by particles in movement in the sample (10) being measured, having a light guide (3) selected from the group consisting of a single-mode light guide and a multi-mode light guide used as an immersion probe into said sample and which transfers laser light from a source (2) to said sample and further which transfers light scattered from said sample to a detector (12) wherein the emergence surface (7) for the laser light at the end of said light guide is inclined at an angle 1°≦φ≦15°, the angle of inclination being defined by the optical axis (8) of said light guide and the normal (9) of said emergence surface.
Claim 2
Dependent Claim
138 words
A fiber-optical sensor for measuring the Doppler broadening of scattered laser light by the principle of quasi-elastic light scattering (QELS) , the scattered light originating from scattering of laser light by particles in movement in the sample (10) being measured, having a light guide (3) selected from the group consisting of a single-mode light guide and a multi-mode light guide used as an immersion probe into said sample and which transfers laser light from a source (2) to said sample and further which transfers light scattered from said sample to a detector (12) wherein the emergence surface (7) for the laser light at the end of said light guide is inclined at an angle 1°≦φ≦15°, the angle of inclination being defined by the optical axis (8) of said light guide and the normal (9) of said emergence surface.
Claim 3
Dependent Claim
19 words
A fiber-optical sensor as defined in claim 1, wherein the emergence surface is inclined at an angle of 1°≦φ≦6°.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-29 | 1994-10-29 | 1995-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-29 | 1998-10-29 | 1999-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-29 | 2002-10-29 | 2003-04-30 | $7700.00 | Window Closed / Lapsed |