US4752131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser-optical arrangement for measuring the degree of dispersion in flowing systems
Assignee: BASF SE
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Filing: 1985-03-28
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Granted: 1988-06-21
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Expires: 2005-03-28
Abstract
Abstract In a laser-optical arrangement for producing signals by light scattering, obscuration or reflection, from flowing particles and/or groups of particles, which are recorded, as time-dependent voltage/current fluctuations, by means of a photodetector (9) via appropriate imaging optics (7,8,18), assignment to the degree of dispersion of the flowing system is based on a subsequent measurement (10) of the root-mean-square value, and, according to the invention, the sample stream (1) is separated from a transmitter (6,7,18) and a receiver (8,9,10) by an enveloping stream (4), and the transmitter side consists of an individual light-transmitting fiber (7) provided with a means for parallel or focused emergence of a light bundle having a diameter of the order of magnitude of the particles and/or groups of particles.
Inventors
- 👤 Josef Eisenlauer
- 👤 Dieter Horn
- 👤 Walter Ditter
- 👤 Heinz Eipel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:19
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/10; G01N15/14; G01N15/1456; G01N15/1459; C; C02; C02F; C02F1/00; C02F1/52; C02F1/5209; G01N15/1404; G01N15/1409; G01N2015/0092; G01N15/02; G01N15/0205; G01N15/0211; G01N2015/0222; G01N21/00; G01N21/17; G01N21/47; G01N21/49; G01N21/53; G01N2201/00; G01N2201/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
170 words
A laser-optical arrangment for measuring the degree of dispersion in a flowing two-phase system containing flowing particles or groups of particles, said arrangement comprising means for producing pulse-like optical signals from said flowing particles or groups of particles, said producing means including optical transmitting means and optical receiving means, and a measuring cell containing enveloping means for separating said flowing system from said transmitting and receiving means, said transmitting means containing a source of laser light, a first light guide in the form of an individual light transmitting fiber and a lens system for causing a parallel or focused light bundle to emerge therefrom which has a diameter of the order of magnitude of the particles or groups of particles, and said receiving means containing a second light guide in the form of a light-transmitting fiber bundle, and a photodetector for producing from said optical signals time-dependent current/voltage fluctuations, and means for deriving from said fluctuations an integrated measurement of the root-mean-square value, thereby to determine the degree of dispersion.
Claim 2
Dependent Claim
170 words
A laser-optical arrangment for measuring the degree of dispersion in a flowing two-phase system containing flowing particles or groups of particles, said arrangement comprising means for producing pulse-like optical signals from said flowing particles or groups of particles, said producing means including optical transmitting means and optical receiving means, and a measuring cell containing enveloping means for separating said flowing system from said transmitting and receiving means, said transmitting means containing a source of laser light, a first light guide in the form of an individual light transmitting fiber and a lens system for causing a parallel or focused light bundle to emerge therefrom which has a diameter of the order of magnitude of the particles or groups of particles, and said receiving means containing a second light guide in the form of a light-transmitting fiber bundle, and a photodetector for producing from said optical signals time-dependent current/voltage fluctuations, and means for deriving from said fluctuations an integrated measurement of the root-mean-square value, thereby to determine the degree of dispersion.
Claim 3
Dependent Claim
32 words
A laser-optical arrangement as claimed in claim 1, wherein the photodetector is operated in a clamping circuit whose D.C. voltage/current value is used as the reference value for normalizing the voltage/current fluctuation.
Claim 4
Dependent Claim
32 words
A laser-optical arrangement as claimed in claim 1, wherein the laser is an integrated semiconductor laser, and the laser light is passed directly via said first light guide to said measuring cell.
Claim 5
Dependent Claim
33 words
A laser-optical arrangement as claimed in claim 1, wherein said photodetector is an integrated detector, and the signals are passed from the measuring cell directly via said second light guide to the detector.
Claim 6
Dependent Claim
20 words
A laser-optical arrangement as claimed in claim 1, wherein the optical and electronic systems of said arrangement are fully integrated.
Claim 7
Dependent Claim
35 words
A laser-optical arrangement as claimed in claim 4, wherein the photodetector used is a silicon avalanche photodiode and the signals are passed from the measuring cell directly via said second light guide to the detector.
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) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-21 | 1999-12-21 | 2000-06-21 | $7700.00 | Window Closed / Lapsed |