US3666945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for measuring the concentration of fluorescent materials in air and water
Assignee: Impulsphysik GmbH
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Filing: 1970-07-30
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Granted: 1972-05-30
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Expires: 1990-07-30
Abstract
Abstract An arrangement through which the concentration of fluorescent materials, when present in low quantities, may be measured within a fluid. A transmitter is flashed periodically at a rate corresponding to the rate that measurements are taken, for the purpose of exciting the fluorescent materials. Filters and optical systems are provided at the transmitter for transmitting the appropriate light. A receiver spaced from the transmitter or light source is also equipped with appropriate filters and optical systems, and receives on a photosensor, the radiation from the fluorescent materials. The resultant electrical signals from the photosensors are amplified and compensated against daylight and cloudy effects of the medium, through an auxiliary amplifier.
Inventors
- 👤 Frank Frungel
- 👤 Peter Krawarik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:00
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/63; G01N21/64; G01N2201/00; G01N2201/02; G01N2201/021; G01N2201/0218; G01N2201/12; G01N2201/124; G01N2201/1244
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
146 words
An arrangement for measuring the concentration of fluorescent materials underwater comprising, in combination, a light source with flash discharge lamp means immersed underwater; a source of energy connected to said light source for flashing said lamp means at a frequency equal to the frequency of measurement, the duration of the emitted exciting radiation exceeding the fluorescent response time; underwater receiver means with photosensor means spaced from said light source for receiving fluorescent light transmitted through the water and impinging on said photosensor means, said photosensor means converting said fluorescent light impinging on said photosensor means into a corresponding electrical signal; compensating means for compensating said receiver means against daylight transmitted through the water and impinging upon said photosensor, so that the sensitivity of said receiver means is unaffected by said daylight; and amplifying means connected to said photosensor for amplifying the amplitude of said electrical signal.
Claim 2
Dependent Claim
146 words
An arrangement for measuring the concentration of fluorescent materials underwater comprising, in combination, a light source with flash discharge lamp means immersed underwater; a source of energy connected to said light source for flashing said lamp means at a frequency equal to the frequency of measurement, the duration of the emitted exciting radiation exceeding the fluorescent response time; underwater receiver means with photosensor means spaced from said light source for receiving fluorescent light transmitted through the water and impinging on said photosensor means, said photosensor means converting said fluorescent light impinging on said photosensor means into a corresponding electrical signal; compensating means for compensating said receiver means against daylight transmitted through the water and impinging upon said photosensor, so that the sensitivity of said receiver means is unaffected by said daylight; and amplifying means connected to said photosensor for amplifying the amplitude of said electrical signal.
Claim 3
Dependent Claim
17 words
The arrangement as defined in claim 1 wherein said flash discharge lamp comprises a spark discharge lamp.
Claim 4
Dependent Claim
27 words
The arrangement as defined in claim 1 wherein said duration of said emitted exciting radiation is substantially within the range of 10 8 to 10 5 seconds.
Claim 5
Dependent Claim
15 words
The arrangement as defined in claim 1 wherein said photosensor means comprises a semi-conductor photodiode.
Claim 6
Dependent Claim
38 words
The arrangement as defined in claim 1 wherein said photosensor means comprises a photomultiplier having relatively few stages of such a low amplification that under daylight influence the anode current remains in the linear range of its characteristic.
Claim 7
Dependent Claim
20 words
The arrangement as defined in claim 1 wherein said electrical signal comprises irregularly spaced pulses between substantially long time intervals.
Claim 8
Dependent Claim
24 words
The arrangement as defined in claim 1 wherein said light source is adjusted for maximum radiation emission within the absorbtion region exciting the fluorescence.
Claim 9
Dependent Claim
22 words
The arrangement as defined in claim 1 wherein said water is subjected to daylight, said electrical signal being independent of said daylight.
Claim 10
Dependent Claim
27 words
The arrangement as defined in claim 1 including intensity stabilization means connected to said source of energy for maintaining constant the light intensity of said lamp means.
Claim 11
Dependent Claim
43 words
The arrangement as defined in claim 1 including auxiliary receiver means connected to said receiver means for receiving diffused light from said water and not responding to fluorescent light, said auxiliary receiving means compensating said electrical signal against clouding effects of said water.
Claim 12
Dependent Claim
47 words
The arrangement as defined in claim 1 wherein the pulse frequency and pulse energy for said discharge lamp means is arranged so that the average power consumption of said light source is substantially smaller than that transportable through a high impedance power cable of substantially long length.
Claim 13
Dependent Claim
45 words
The arrangement as defined in claim 1 including cable means connected to said light source for transmitting energy thereto, saiD cable means being a substantially high tensile strength cable with steel core, said electrical signal being transmitted through said cable as a superimposed modulated signal.
Claim 14
Dependent Claim
19 words
The arrangement as defined in claim 1 including battery means connected to said light source and said receiver means.
Claim 15
Dependent Claim
18 words
The arrangement as defined in claim 1 including buoy means and recording means for recording said electrical signal.
Claim 16
Dependent Claim
43 words
The arrangement as defined in claim 1 including filter means in said light source and said receiver means adapted to fluorescent radiation; and remote filter control means connected to said filter means for selectively controlling said filter means for correspondence to said radiation.
Claim 17
Dependent Claim
18 words
The arrangement as defined in claim 15 wherein said filter means is adapted to rhodamine concentration and bioplasma.
Claim 18
Dependent Claim
31 words
The arrangement as defined in claim 1 including separate pressure resistant housing means for said light source and said receiver means, said separate housing means being pivotable relative to each other.
Claim 19
Dependent Claim
17 words
The arrangement as defined in claim 1 including supporting means for supporting said arrangement below sea level.
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |