Infrared measuring device, especially for the spectrometry of aqueous systems, preferably multiple component systems

• US 7,812,312 B2
• Filed: 04/03/2003
• Issued: 10/12/2010
• Est. Priority Date: 04/03/2002
• Status: Active Grant

• Current Assignee: DiaMonTech AG
• Original Assignee: Johann Wolfgang Goethe-Universitaet
• Inventors: Klein, Oliver, Mantele, Werner, Barth, Andreas, Zscherp, Christian, Von Prollius, Hellmuth, von Germar, Frithjof, Von Lillienfeld-Toal, Hermann, Offermanns, Heribert
• Primary Examiner(s): Porta; David P
• Assistant Examiner(s): Gaworecki; Mark R
• Application Number:
  US10/510,017
• Publication Number:
  US 20060043301A1
• Time in Patent Office: 2,749 Days
• Field of Search: 250/343, 250/338.1, 250/339.1, 250/339.06, 250/339.07, 250/339.08, 702/28
• US Class Current: 250/343
• CPC Class Codes: G01J 2003/425 Reflectance
• CPC Class Codes: G01J 3/45 Interferometric spectrometry
• CPC Class Codes: G01N 21/3577 for analysing liquids, e.g. polluted water
• CPC Class Codes: G01N 21/552 Attenuated total reflection
• CPC Class Codes: G01N 21/85 Investigating moving fluids or granular solids

Abstract

The invention relates to an infrared measuring device, especially for the spectrometry of aqueous systems. Said device comprises at least one measuring unit, especially a measuring cell, also comprising at least one ATR-body and at least one infrared light source. The measuring unit contains at least one ATR-body which comprises at least two planar, substantially parallel limiting surfaces and which is transparent with respect to measuring radiation and which has an index of refraction which is greater than that of the medium which is arranged next to at least one limiting surface and which is to be examined, especially larger or equal to 1.5. The IR-measuring radiation on at least one of the planar, parallel limiting surfaces of the ATR-body can be totally reflected in an attenuated manner by at least six times.

Claims

1. Infrared (IR) measuring device, for essentially simultaneous, qualitative and quantitative determination of components in nonaqueous and aqueous systems, comprising:

at least one measuring unit having at least one ATR body and at least one infrared light source, wherein the at least one ATR body has at least two plane, essentially parallel boundary surfaces and is transparent or partially transparent to measuring radiation and has a refractive index which is higher than that of the medium to be investigated adjacent to at least one boundary surface where the measuring radiation is middle infrared radiation (MIR) and can undergo attenuated total reflection at least six times on at least one of the plane, parallel boundary surfaces of the at least one ATR body, wherein the at least one infrared light source includes one or more quantum cascade lasers that can emit electromagnetic radiation of at least one defined frequency or of at least one defined frequency band.

2. Infrared measuring device according to claim 1, including at least one computer-aided evaluation unit.

3. Infrared measuring device according to claim 2, wherein the at least one evaluation unit can be replaced by a second or further evaluation units.

4. Infrared measuring device according to claim 1, wherein the plane, essentially parallel boundary surfaces are essentially not metal-coated.

5. Infrared measuring device according to claim 1, wherein the ATR body represents at least one wall of a measuring cell or a part thereof or represents the measuring cell.

6. Infrared measuring device according to claim 1, wherein the ATR body is made of a material selected from the group consisting of diamond, sapphire, cadmium telluride, thallium bromide/iodide, silicon, germanium, zinc selenide, zinc sulfide, magnesium difluoride, cesium iodide, silver chloride, calcium difluoride, potassium bromide, sodium chloride, a material transparent to infrared radiation, a polymeric material with a refractive index of greater than or equal to 1.5 and polyethylene.

7. Infrared measuring device according to claim 1 further including an evaluation unit that implements one or more factorial analyses, multiple least square algorithms or neural network analyses based on the signals entering the detector.

8. Infrared measuring device according to claim 1, wherein at least the ATR body or the measuring unit is thermostated.

9. Infrared measuring device according to claim 1, wherein the ATR body can be placed at least on one boundary surface, which can be exposed to a medium to be analyzed, and includes a coating, which is transparent to the an evanescent field of the measuring radiation.

10. Infrared measuring device according to claim 9, wherein the coating has a thickness which is either smaller than half of the wavelength of the measuring radiation used or in the range from about 2 nm to about 25 μ

m.

11. The infrared measuring device according to claim 10 wherein the coating has a thickness which is in the range from about 2 μ

m to about 10 μ

m.

12. The infrared measuring device according to claim 10, wherein the thickness is both smaller than half of the wavelength of the measuring radiation and in the range from about 2 nm to about 25 μ

m.

13. Infrared measuring device according to claim 9, wherein the coating has a thickness in the range of one-fourth of the wavelength of the measuring radiation used.

14. Infrared measuring device according to claim 9, wherein the coating has an ATR body material layer and the coated ATR body comprises zinc selenide and/or zinc sulfide.

15. Infrared measuring device according to claim 14, wherein said ATR body material layer is a diamond layer.

16. A method of using the infrared measuring device of claim 1 to perform a chemical analysis, including using the infrared measuring device for the qualitative and/or quantitative determination of one or more components, selected from the group consisting of saccharides, urea, creatinine, triglycerides, carbon dioxide, protein, alcohols, phosphoric acid esters and combinations thereof, in nonaqueous or aqueous systems.

17. The method of claim 16, where one of beer, wine, fruit juice, spirits or soft drinks is used as an aqueous system.

18. The method of claim 16, where one of urine and/or feces is used as an aqueous system.

19. The method of claim 16, where one of lymph, saliva and/or blood is used as an aqueous system.

20. The method of claim 16, where the washing fluid obtained during dialysis is used as an aqueous system.

21. The method of claim 16, where process fluid, waste water or washing liquor is used as an aqueous system.

22. The method of claim 16, wherein the qualitatively and/or quantitatively determination of the presence of one or more components selected from the group consisting of saccharides, urea, creatinine, triglycerides, carbon dioxide, protein, alcohols and/or phosphoric acid esters, in nonaqueous or aqueous systems, is performed essentially simultaneously.

23. A method of using the infrared measuring device according to claim 1, including using the infrared measuring device for the qualitative and/or quantitative determination of components in fruits and vegetables.

24. A method of using the infrared measuring device according to claim 1, including using the infrared measuring device for the qualitative and/or quantitative determination of components in milk and dairy products.

25. The infrared measuring device of claim 1, wherein the refractive index is higher than or equal to 1.5.

26. The infrared measuring device of claim 1, wherein the one or more quantum cascade lasers can emit electromagnetic radiation of at least two defined frequencies.

27. The infrared measuring device of claim 1, wherein the one or more of the quantum cascade lasers can emit the electromagnetic radiation of the at least one defined frequency or the defined frequency band at a predetermined and defined intensity.

28. A method comprising using the measuring device of claim 1 for the quantitative and/or qualitative determination of two, three, four, five, six or more components in multicomponent mixtures in the body fluids of living organisms.

29. Infrared (IR) measuring device, for essentially simultaneous, qualitative and quantitative determination of components in nonaqueous and aqueous systems, comprising:

at least one measuring unit having at least one ATR body and at least one infrared light source, wherein the at least one ATR body has at least two plane, essentially parallel boundary surfaces and is transparent or partially transparent to measuring radiation and has a refractive index which is higher than that of the medium to be investigated adjacent to at least one boundary surface where the measuring radiation is middle infrared radiation (MIR) and can undergo attenuated total reflection at least six times on at least one of the plane, parallel boundary surfaces of the at least one ATR body, wherein the infrared light source includes one or several quantum cascade lasers wherein two or more of the quantum cascade lasers can emit electromagnetic radiation of different frequencies and/or of different frequency bands, in the middle infrared region.

30. Infrared measuring device according to claim 29, wherein the two or more quantum cascade lasers can simultaneously or almost simultaneously emit the electromagnetic radiation of the different frequencies, and/or of the different frequency bands.

31. The infrared measuring device of claim 29, wherein the two or more of the quantum cascade lasers can emit the electromagnetic radiation of the different frequencies or of the different frequency bands at predetermined and defined intensities.

32. Infrared (IR) measuring device, for essentially simultaneous, qualitative and quantitative determination of components in nonaqueous and aqueous systems, comprising:

at least one measuring unit having at least one ATR body and at least one infrared light source, wherein the at least one ATR body has at least two plane, essentially parallel boundary surfaces and is transparent or partially transparent to measuring radiation and has a refractive index which is higher than that of the medium to be investigated adjacent to at least one boundary surface where the measuring radiation is middle infrared radiation (MIR) and can undergo attenuated total reflection at least six times on at least one of the plane, parallel boundary surfaces of the at least one ATR body, including one or more quantum cascade lasers that can emit electromagnetic radiation of different frequencies, and/or of different frequency bands in a time sequence.

33. The infrared measuring device of claim 32, wherein the one or more of the quantum cascade lasers can emit the electromagnetic radiation of the different frequencies or of the different frequency bands at predetermined and defined intensities.

34. Infrared (IR) measuring device, for essentially simultaneous, qualitative and quantitative determination of components in nonaqueous and aqueous systems, comprising:

at least one measuring unit having at least one ATR body and at least one infrared light source, wherein the at least one ATR body has at least two plane, essentially parallel boundary surfaces and is transparent or partially transparent to measuring radiation and has a refractive index which is higher than that of the medium to be investigated adjacent to at least one boundary surface where the measuring radiation is middle infrared radiation (MIR) and can undergo attenuated total reflection at least six times on at least one of the plane, parallel boundary surfaces of the at least one ATR body, including at least one quantum cascade laser that can emit electromagnetic radiation in the form of pulses with defined duration.

35. Infrared measuring device according to claim 34, wherein the duration of the pulses differs in length and/or the intensity of the pulses differs in magnitude.

36. Infrared measuring device according to claim 34, wherein different frequencies or frequency bands of electromagnetic radiation originating from the at least one quantum cascade laser can be emitted sequentially or in any arbitrary sequence.

37. Infrared measuring device according to claim 36, wherein the measuring radiation and/or its intensity can be detected according to a multiplex pattern in a wavelength-specifically controllable, pulsewise emittable manner, and/or according to a multiplex pattern of the measuring radiation in a pulsed form.

38. The infrared measuring device of claim 34, wherein the at least one quantum cascade laser can emit the electromagnetic radiation in the form of the pulses each with a predetermined and defined intensity.

39. Infrared (IR) measuring device, for essentially simultaneous, qualitative and quantitative determination of components in nonaqueous and aqueous systems, comprising:

at least one measuring unit having at least one ATR body and at least one infrared light source, wherein the at least one ATR body has at least two plane, essentially parallel boundary surfaces and is transparent or partially transparent to measuring radiation and has a refractive index which is higher than that of the medium to be investigated adjacent to at least one boundary surface where the measuring radiation is middle infrared radiation (MIR) and can undergo attenuated total reflection at least six times on at least one of the plane, parallel boundary surfaces of the at least one ATR body,

wherein the at least one infrared light source comprises

a quantum cascade laser able to emit electromagnetic radiation in at least two different defined frequencies or one or more frequency bands,

a plurality of quantum cascade lasers each being able to emit electromagnetic radiation at one or more frequencies or frequency bands, or

a radiation source emitting a multi-wavelength spectrum.

40. Urinal, or a urinal pan, comprising:

at least one ATR body, with at least two plane, essentially parallel boundary surfaces, which is transparent to middle infrared radiation (MIR), and has a refractive index which is higher than that of a medium to be investigated, which is adjacent to at least one boundary surface, into which a laser beam and/or at least one discharge line, into which a measuring unit containing the at least one ATR body with at least two plane, essentially parallel boundary surfaces, which is transparent or partially transparent to a measuring radiation, and has a refractive index, which is higher than that of the medium to be investigated adjacent to at least one boundary surface, into which a laser beam can be coupled, wherein the laser beam is a beam of a quantum cascade laser.

41. Toilet, including a toilet bowl, comprising:

at least one ATR body with at least two plane, essentially parallel boundary surfaces, which is transparent to middle infrared radiation (MIR), and which has a refractive index, which is higher than that of a medium to be investigated, which is adjacent to at least one boundary surface into which a laser beam can be coupled; and

/or at least a drain pipe, into which a measuring unit containing the at least one ATR body with at least two plane, essentially parallel boundary surfaces, which is transparent or partially transparent to a measuring radiation and has a refractive index which is higher than that of a medium to be investigated, which is adjacent to at least one boundary surface is placed, into which a laser beam can be coupled, wherein the laser beam is a beam of a quantum cascade laser.

46. The cannula of claim 41, wherein the refractive index is higher than or equal to 1.5.

42. Cannula comprising:

at least one measuring cell containing at least one ATR body with at least two plane, essentially parallel, boundary surfaces which is transparent or partially transparent to middle infrared radiation (MIR), and which has a refractive index which is higher than that of the medium being investigated, which is adjacent to at least one of the boundary surfaces, into which at least one beam of a quantum cascade laser can be coupled and at least one infrared measuring beam can undergo attenuated total reflection at least six times along the measuring section, on at least one of the plane, parallel boundary surfaces of the ATR body; and

at least one hollow body.

43. Cannula according to claim 42, comprising

an infrared measuring device having the at least one ATR body and at least one infrared light source, wherein the measuring unit contains the at least one ATR body, which has at least two plane, essentially parallel boundary surfaces, which are transparent or partially transparent to the measuring beam and which have a refractive index which is higher than that of the medium to be investigated adjacent to at least one boundary surface, where the measuring beam contains middle infrared radiation (MIR) and can undergo attenuated total reflection at least six times on at least one of the plane, parallel boundary surfaces of the at least one ATR body, wherein the at least one ATR body is in working connection with at least one quantum cascade laser and/or a detector and/or an evaluation unit.

44. A method comprising using the cannula of claim 42 for the quantitative and/or qualitative determination of two, three, four, five, six or more components in multicomponent mixtures.

45. The method according to claim 44, wherein said components are selected from the group consisting of saccharides, urea, creatinine, and triglycerides.

47. Cannula according to claim 42, wherein the cannula is a stent.