Analysis system

• US 5,610,706 A
• Filed: 02/02/1994
• Issued: 03/11/1997
• Est. Priority Date: 02/02/1994
• Status: Expired due to Fees

• Current Assignee: The Thermo Jarrell ASH Corporation
• Original Assignee: The Thermo Jarrell ASH Corporation
• Inventors: Kunselman, Garry C., Carroll, Charles E., Tobey, Arthur E.
• Primary Examiner(s): McGraw, Vincent P.
• Application Number:
  US08/191,395
• Time in Patent Office: 1,133 Days
• Field of Search: 356/70-73, 356/313, 356/440
• US Class Current: 356/70
• CPC Class Codes: G01N 21/69 specially adapted for fluids , e.g. molten metal
• CPC Class Codes: G01N 33/2888 Lubricating oil characteristics, e.g. deterioration lubricating properties G01N33/30

Abstract

An analytical system for analyzing a liquid sample includes structure defining an analysis region with an inlet and an outlet, a polychromator system disposed in sensing relation to the analysis region, structure defining a sample inlet port, and structure connecting the sample inlet port to the inlet of the analysis region. The analysis region includes sample excitation apparatus with a pair of spaced metal electrodes, one of the electrodes having an upper surface in spaced juxtaposition to the other electrode and passage structure connected to the inlet of the analysis region. The one metal electrode is disposed with the passage structure extending to an outlet port in the upper surface, and structure in the upper surface defines a plurality of channels extending away from the outlet port of the passage structure for discharge of excess quantities of a liquid sample to be analyzed flowed through the passage structure. Control structure flows a sample to be analyzed from the sample inlet port through the analysis region, and output structure coupled to the analysis region provides output data as a function of the output of the polychromator system.

Claims

1. An analytical system for analyzing a liquid sample comprising

housing structure,

structure in said housing structure defining a first analysis region having an inlet and an outlet, a FTIR analysis system disposed in sensing relation to said first analysis region,

structure in said housing structure defining a second analysis region having an inlet and an outlet, a polychromator system disposed in sensing relation to said second analysis region,

sample excitation apparatus disposed in said second analysis region, said sample excitation apparatus including a pair of spaced metal electrodes, one of said electrodes having an upper surface in spaced juxtaposition to the other electrode and a through passage connected to said inlet of said second analysis region, said one metal electrode being disposed with said through passage extending to an outlet port in said upper surface, and structure in said upper surface defining a plurality of channels extending away from said outlet port of said through passage for discharge of excess quantities of a liquid sample to be analyzed flowed through said through passage,

structure defining a sample inlet port, structure connecting said sample inlet port to said inlets of said first and second analysis regions,

control structure in said housing structure for flowing a sample to be analyzed from said sample inlet port through said first and second analysis regions, and

output structure coupled to said first and second analysis regions for providing output data as a function of the outputs of said FTIR system and said polychromator system as a function of the liquid sample flowed through said first and second analysis regions.

2. The system of claim 1 wherein said FTIR analysis system includes a flow through cell comprising a pair of spaced plate members, said first analysis region being disposed between said plate members, interferometer structure for generating a beam of radiation for passage through said plate members and said first analysis region, and sensor structure for sensing the beam of radiation passed through said plate members and said first analysis region for generating FTIR analysis information as function of the liquid sample disposed in said first analysis region.

3. The system of claim 1 wherein said polychromator system includes entrance slit structure, exit slit structure composed of a plurality of exit slit regions, and radiation dispersing structure for dispersing radiation passing through said entrance slit structure into a spectrum for application to said exit slit regions.

4. The system of claim 1 wherein each said metal electrode contains at least ninety-nine percent of a particular metal.

5. The system of claim 4 wherein said particular metal of each said electrode is silver.

6. The system of claim 1 wherein said second analysis region includes sample excitation apparatus disposed in an enclosed chamber, said chamber having an outlet port across which filter structure is disposed, and structure for flowing gas from said chamber through said filter structure for exhaust outside said housing structure.

7. The system of claim 1 wherein said second analysis region includes sample excitation apparatus disposed in an enclosed chamber, and said sample excitation apparatus includes a pair of spaced main electrodes and a pair of trigger electrodes disposed in spaced relation to said main electrodes in said analysis region such that the breakdown of the gap between said trigger electrodes generates ultraviolet radiation to preionize the gap between said main electrodes.

8. The system of claim 1 and further including wheel structure on which said housing structure is mounted so that said analysis system is relatively mobile.

9. The system of claim 1 wherein said housing structure includes shock absorbing structure, and said polychromator system is mounted on said shock absorbing structure.

10. An analytical system for analyzing a liquid sample comprising

housing structure,

structure in said housing structure defining a first analysis region having an inlet and an outlet, a FTIR analysis system disposed in sensing relation to said first analysis region,

structure in said housing structure defining a second analysis region having an inlet and an outlet, a polychromator system disposed in sensing relation to said second analysis region,

structure defining a sample inlet port, structure connecting said sample inlet port to said inlets of said first and second analysis regions,

control structure in said housing structure for flowing a sample to be analyzed from said sample inlet port through said first and second analysis regions,

said control structure including a pump that has forward and reverse modes of operation, said first and second analysis regions being connected in series, and said control structure flowing a sample to be analyzed at a first flow rate into said first analysis region with said pump being stopped during an FTIR analysis cycle, and said pump being operated in a reverse flow mode during a first part of a polychromator analysis cycle to remove excess sample material from the second analysis region and then in a relatively low forward flow rate mode during a second part of said polychromator analysis cycle, and

output structure coupled to said first and second analysis regions for providing output data as a function of the outputs of said FTIR system and said polychromator system as a function of the liquid sample flowed through said first and second analysis regions.

11. The system of claim 10 wherein said relatively low forward flow rate is less than one-half said first flow rate.

12. A process for analyzing liquid sample material such as a lubricating oil comprising the steps of:

providing a first analysis region with an FTIR analysis system disposed in sensing relation to said first analysis region,

providing structure defining a second analysis region with a polychromator system disposed in sensing relation to said second analysis region,

flowing a liquid sample to be analyzed into said first analysis region, stopping the liquid sample flow while said liquid sample is in said first analysis region and subjecting that liquid sample in said first analysis region to an FTIR analysis sequence,

flowing the liquid sample into said second analysis region, reversing the flow direction to remove excess sample from said second analysis region, resuming flow in the forward direction at a low flow rate and concurrently subjecting said liquid sample in said second analysis region to an electric discharge to excite the liquid sample to spectroemissive levels for sensing by said polychromator system.

13. The process of claim 12 wherein said liquid sample is a lubricating oil material, said polychromator system senses for metal constituents in said lubricating oil, and said FTIR system senses for constituents such as glycol, water, fuel and soot.

14. An analytical system for analyzing a liquid sample comprising:

structure defining an analysis region having an inlet and an outlet, a spectrometer system disposed in sensing relation to said analysis region,

structure defining a sample inlet port, structure connecting said sample inlet port to said inlet of said analysis region,

said analysis region including sample excitation apparatus with a pair of spaced metal electrodes, one of said electrodes having an upper surface in spaced juxtaposition to the other electrode and passage structure connected to said inlet of said analysis region, said one metal electrode being disposed with said passage structure extending to an outlet port in said upper surface, and structure in said upper surface defining a plurality of channels extending away from said outlet port of said passage structure for discharge of excess quantities of a liquid sample to be analyzed flowed through said passage structure,

control structure for flowing a sample to be analyzed from said sample inlet port through said analysis region, and

output structure coupled to said analysis region for providing output data as a function of the output of said spectrometer system as a function of the liquid sample flowed through said analysis region.

15. The system of claim 14 wherein said control structure for flowing a sample includes a pump that has forward and reverse modes of operation, and said control structure operates said pump in a reverse flow mode during a first part of a spectrometer analysis cycle to remove excess sample material from said analysis region and then in a relatively low forward flow rate mode during a second part of said spectrometer analysis cycle.

16. The system of claim 14 wherein said sample excitation apparatus is disposed in an enclosed chamber, said chamber having an outlet port across which filter structure is disposed, and structure for flowing gas from said chamber through said filter structure for exhaust outside said housing structure.

17. The system of claim 16 and further including wheel structure on which said housing is mounted so that said analysis system is relatively mobile.

18. The system of claim 14 wherein said spectrometer system includes entrance slit structure, exit slit structure composed of a plurality of exit slit regions, and radiation dispersing structure for dispersing radiation passing through said entrance slit structure into a spectrum for application to said exit slit regions.

19. The system of claim 18 wherein said sample excitation apparatus is disposed in an enclosed chamber, said chamber having an outlet port across which filter structure is disposed, and structure for flowing gas from said chamber through said filter structure for exhaust outside said housing structure.

20. The system of claim 19 and further including wheel structure on which said housing structure is mounted so that said analysis system is relatively mobile.

21. The system of claim 20 wherein said housing structure includes shock absorbing structure, said spectrometer system is mounted on said shock absorbing structure.

22. The system of claim 21 wherein said control structure for flowing a sample includes a pump that has forward and reverse modes of operation, and said control structure operates said pump in a reverse flow mode during a first part of a polychromator analysis cycle to remove excess sample material from said analysis region and then in a relatively low forward flow rate mode during a second part of said polychromator analysis cycle.

23. The system of claim 22 wherein said relatively low forward flow rate is less than one-half said first flow rate.

24. The system of claim 14 wherein each said metal electrode contains at least ninety-nine percent of a specific metal.

25. The system of claim 23 wherein said specific metal is silver.

26. An analytical system comprising:

structure defining an analysis region, a spectrometer system disposed in sensing relation to said analysis region,

said analysis region including sample excitation apparatus with a pair of spaced main electrodes, and a pair of trigger electrodes disposed in spaced relation to said main electrodes in said analysis region such that the breakdown of the gap between said trigger electrodes generates ultraviolet radiation to preionize the gap between said main electrodes,

one of said main electrodes has an upper surface in spaced juxtaposition to the other main electrode, said one main electrode having passage structure extending to an outlet port in said upper surface, and structure in said upper surface defining a plurality of channels extending away from said outlet port of said passage structure for discharge of excess quantities of a liquid sample to be analyzed flowed through said passage structure,

and output structure coupled to said analysis region for providing output data as a function of the output of said spectrometer system as a function of the sample in said analysis region.

27. The system of claim 26 and further including housing structure in which said spectrometer system and said analysis region are disposed;

said housing structure including shock absorbing structure, and said spectrometer system being mounted on said shock absorbing structure.

28. A process for analyzing liquid sample material such as a lubricating oil comprising the steps of:

providing structure defining an analysis region with a polychromator system disposed in sensing relation to said analysis region,

said polychromator system including entrance slit structure, exit slit structure composed of a plurality of exit slit regions, and radiation dispersing structure for dispersing radiation passing through said entrance slit structure into a spectrum for application to said exit slit regions,

flowing a liquid sample to be analyzed into said analysis region at a first flow rate, reversing the flow direction to remove excess liquid sample from said analysis region, resuming flow in the forward direction at a low flow rate and concurrently subjecting said liquid sample in said analysis region to an electric discharge to excite the liquid sample to spectroemissive levels for sensing by said polychromator system.

29. The process of claim 28 wherein said analysis region includes sample excitation apparatus that includes a pair of spaced metal electrodes, one of said electrodes having an upper surface in spaced juxtaposition to the other electrode and passage structure connected to said inlet of said analysis region, said one metal electrode being disposed with said passage structure extending to an outlet port in said upper surface, and structure in said upper surface defining a plurality of channels extending away from said outlet port of said passage structure for discharge of excess quantities of a liquid sample to be analyzed flowed through said passage structure.

30. The process of claim 29 wherein said liquid sample is a lubricating oil material, and said polychromator system senses metal constituents in said lubricating oil material.

31. The process of claim 29 wherein each said metal electrode contains at least ninety-nine percent silver.

32. The process of claim 28 wherein said analysis region includes sample excitation apparatus that includes a pair of spaced electrodes, and a pair of spaced main trigger electrodes, one of said main electrodes has an upper surface in spaced juxtaposition to the other main electrode, said one main electrode having passage structure extending to an outlet port in said upper surface, and structure in said upper surface defining a plurality of channels extending away from said outlet port of said passage structure for discharge of excess quantities of a liquid sample to be analyzed flowed through said passage structure, said trigger electrodes being disposed in adjacent spaced relation to said main electrodes such that the breakdown of the gap between said trigger electrode generates ultraviolet radiation to preionize the gap between said main electrodes, and subjecting said liquid sample in said analysis region to an electric discharge between said main electrodes to excite the liquid sample to spectroemissive levels for sensing by said polychromator system.

33. The process of claim 32 wherein said relatively low forward flow rate is less than one-half said first flow rate.