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 Title: |
US5957858:
Systems and methods for monitoring relative concentrations of different isotopic forms of a chemical species
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Micheels, Ronald H.; Concord, MA
Kaunitz, Jonathan D.; Santa Monica, CA
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| Assignee: |
Polestar Technologies, Inc., Needham Heights, MA
other patents from POLESTAR TECHNOLOGIES, INC. (758738) (approx. 3)
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| Published / Filed: |
1999-09-28
/ 1996-12-10
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| Application Number: |
US1996000763243
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| IPC Code: |
Advanced:
G01N 21/35;
Core:
G01N 21/31;
IPC-7:
A61B 5/097;
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| ECLA Code: |
G01N21/35B;
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| U.S. Class: |
Current:
600/529;
250/339.03;
250/345;
600/532;
Original:
600/529;
600/532;
250/345;
250/339.03;
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| Field of Search: |
600/532,529
356/311
250/339.03,345
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| Priority Number: |
| 1996-12-10 |
US1996000763243 |
| 1996-07-26 |
US1996000687761 |
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| Abstract: |
Method and system for measuring the relative concentrations of first and second isotopic forms of a chemical species within a sample. The present invention need not use a laser or high resolution spectrometer. The system typically includes a waveguide cell with good transmission of particular wavelengths of IR radiation, such as a hollow glass fiber waveguide cell. A source emits electromagnetic radiation, which is modulated at first and second wavelength bands that correspond to absorption bands of the first and second isotopic forms of the chemical species, respectively. In certain embodiments, the source is a filtered broad band source, such as a plurality of LEDs. In some embodiments, an FTIR spectrometer may serve as a filtered source and signal detector.
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| Attorney, Agent or Firm: |
Wolf, Greenfield & Sacks, P.C. ;
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| Primary / Asst. Examiners: |
Lateef, Marvin M.; Mercader, Eleni Mantis
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| Maintenance Status: |
E2 Expired Check current status
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| INPADOC Legal Status: |
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| Parent Case: |
This application is a continuation of prior application Ser. No. 08/687,761 filed Jul. 26, 1996 by Ronald H. Micheels entitled "SYSTEMS AND METHODS FOR MONITORING RELATIVE CONCENTRATIONS OF DIFFERENT ISOTOPIC FORMS OF A CHEMICAL SPECIES", now abandoned.
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| Family: |
None
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First Claim:
Show all 41 claims |
We claim:
1. A system for monitoring relative concentrations of a chemical species, the system comprising:
- a sample including first and second isotopic forms of the chemical species;
- a source for simultaneously emitting electromagnetic radiation at first and second wavelength bands, the first wavelength band corresponding to an absorption band of the first isotopic form, the second wavelength band corresponding to an absorption band of the second isotopic form;
- a device for modulating the electromagnetic radiation emitted by the source at the first and second wavelength bands;
- a waveguide cell defining a sample cell having a pathlength of from about 30 centimeters to about 100 centimeters and an inner diameter of from about 0.3 millimeters to about 2.0 millimeters; and
- a detector for detecting the first and second wavelength bands,
- wherein the system is arranged such that at least a portion of the electromagnetic radiation emitted by the source is modulated by the device, enters the waveguide, impinges upon the sample contained within the sample cell defined by said waveguide cell, and at least 10% of the first and second wavelength bands of the portion of the electromagnetic radiation that enters the waveguide cell passes through the waveguide cell and impinges upon the detector.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
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