US4643877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorometer
Assignee: Max-Planck-Gesellschaft zur Förderung der Wissenschaften eV
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Filing: 1984-08-08
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Granted: 1987-02-17
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Expires: 2004-08-08
Abstract
Abstract In order to increase measuring sensitivity of a fluorometer, a transmitter of monochromatic test light beam is arranged opposite a receiver of a measuring light beam. A measuring chamber including a fluorescent indicator space is arranged between the transmitter and the receiver. The distance between the transmitter and the receiver is adjustable to match to the thickness of the measuring chamber.
Inventors
- 👤 Norbert Opitz
- 👤 Dietrich W. Lubbers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:39
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/63; G01N21/64; G01N21/645; G01N21/6428; G01N2021/6434; G01N21/75; G01N21/77; G01N2021/7769; G01N2021/7786; G01N21/78; G01N21/80
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
124 words
A fluorometer comprising a transmitter of a monochromatic light beam, the transmitter including a semi-conductive light emitting diode, a receiver of a monochromatic light beam, the receiver including a semiconductive photoelectric device, a measuring chamber enclosing an indicator space including fluorescent indicating means, and means for introducing an object of measurement in effective contact with the indicator space, the transmitter having a light output side and the receiver having a light input side, said light output and input sides being arranged opposite each other and the measuring chamber being arranged therebetween so that the distance between the transmitter and the receiver corresponds substantially to the thickness of the measuring chamber, and means for adjusting spacing between said transmitter, said measuring chamber and said receiver.
Claim 2
Dependent Claim
124 words
A fluorometer comprising a transmitter of a monochromatic light beam, the transmitter including a semi-conductive light emitting diode, a receiver of a monochromatic light beam, the receiver including a semiconductive photoelectric device, a measuring chamber enclosing an indicator space including fluorescent indicating means, and means for introducing an object of measurement in effective contact with the indicator space, the transmitter having a light output side and the receiver having a light input side, said light output and input sides being arranged opposite each other and the measuring chamber being arranged therebetween so that the distance between the transmitter and the receiver corresponds substantially to the thickness of the measuring chamber, and means for adjusting spacing between said transmitter, said measuring chamber and said receiver.
Claim 3
Dependent Claim
22 words
A fluorometer as defined in claim 1, wherein both the light emitting diode and the semiconductive photoelectric device include a monochromatic filter.
Claim 4
Dependent Claim
37 words
A fluorometer as defined in claim 1, wherein the fluorescent indicating means includes fluorescent indicators whose quenching coefficient is locally differentiated, and the indicator space being shiftable transversely with respect to the light beam from the transmitter.
Claim 5
Dependent Claim
24 words
A fluorometer as defined in claim 1, wherein the fluorescent indicating means includes fluorescent indicators whose quenching constant is less than 10 -3 Torr.
Claim 6
Dependent Claim
24 words
A fluorometer as defined in claim 1, wherein the measuring chamber communicates with said introducing means is in the form of a throughflow chamber.
Claim 7
Dependent Claim
14 words
A fluorometer as defined in claim 5 wherein said introducing means includes a flowmeter.
Claim 8
Dependent Claim
30 words
A fluorometer as defined in claim 1, wherein the measuring chamber includes opposite windows facing respectively the transmitter and the receiver, the windows being in the form of monochromatic filters.
Claim 9
Dependent Claim
92 words
A fluorometer as defined in claim 1, wherein the measuring chamber communicates with a reference chamber including fluorescent indicating means defining a reference indicator space, a reference monochromatic light receiver arranged opposite the reference indicator space, the monochromatic light transmitter being positioned and arranged to transmit a test light beam both to the measuring chamber and to the reference chamber, and means for computing a quotient from output signals of the measuring light receiver and the reference light receiver to provide an indication which is independent of fluctuations of the light intensity.
Claim 10
Dependent Claim
31 words
A fluorometer as defined in claim 8, wherein the fluorescent indicating means includes fluorescent indicators at a concentration which absorbs the monochromatic test light beam before it reaches the light receiver.
Claim 11
Dependent Claim
19 words
A fluorometer as defined in claim 8, further comprising means for focussing the test light beam from the transmitter.
Claim 12
Dependent Claim
18 words
A fluorometer as defined in claim 1 further comprising means for adjusting the thickness of said measuring chamber.
Claim 13
Dependent Claim
23 words
A fluorometer as defined in claim 1 wherein said indicator space is arranged at a side of said measuring chamber facing said receiver.
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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) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |