Systems and methods for wavelength selective measurement of properties of small volume liquid samples

• US 7,277,175 B2
• Filed: 09/21/2004
• Issued: 10/02/2007
• Est. Priority Date: 09/21/2004
• Status: Expired due to Fees

• Current Assignee: Agilent Technologies, Inc.
• Original Assignee: Agilent Technologies, Inc.
• Inventors: Kralik, John C., Thompson, Judith A.
• Primary Examiner(s): EVANS, FANNIE L
• Application Number:
  US10/946,209
• Publication Number:
  US 20060061764A1
• Time in Patent Office: 1,106 Days
• Field of Search: 356/416, 356/417, 356/418, 356/419, 356/414
• US Class Current: 356/416
• CPC Class Codes: G01J 2003/1217 Indexed discrete filters or choppers
• CPC Class Codes: G01J 3/0202 Mechanical elements; Supports for optical elements
• CPC Class Codes: G01J 3/027 Control of working procedures of a spectrometer; Failure detection; Bandwidth calculation
• CPC Class Codes: G01J 3/12 Generating the spectrum; Monochromators
• CPC Class Codes: G01N 2021/3133 with selection of wavelengths before the sample
• CPC Class Codes: G01N 2021/3174 Filter wheel
• CPC Class Codes: G01N 21/31 Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry G01N21/72 takes precedence
• CPC Class Codes: G01N 2201/08 Optical fibres; light guides

Abstract

A system for measuring properties of small volume liquid samples, where the system includes wavelength selective filters.

Claims

1. An apparatus comprising:

a source of electromagnetic radiation;

a first optical system;

an optical delivery system capable of providing electromagnetic radiation from said source to said first optical system;

said first optical system being capable of substantially collimating the provided electromagnetic radiation;

a sample holding assembly capable of holding a microvolume liquid sample and placing the microvolume liquid sample in an optical path of the substantially collimated electromagnetic radiation;

the substantially collimated electromagnetic radiation also being transmitted through at least a portion of said sample holding assembly;

a filter assembly comprising at least one filter, said filter assembly being positioned in the optical path of the substantially collimated electromagnetic radiation;

a second optical system capable of receiving electromagnetic radiation transmitted through the sample and said at least a portion of said sample holding assembly and through said filter assembly;

a detecting system capable of detecting electromagnetic radiation; and

,

an optical transmission system capable of receiving electromagnetic radiation from said second optical system and transmitting the received electromagnetic radiation to said detecting system;

said second optical system being also capable of transmitting electromagnetic radiation to said optical transmission system; and

said detecting system being optical disposed to receive electromagnetic radiation from said optical transmission system.

2. The apparatus of claim 1 wherein said filter assembly is located between said sample holding assembly and said second optical system.

3. The apparatus of claim 1 wherein said filter assembly is located between said sample holding assembly and said first optical system.

4. The apparatus of claim 1 wherein said filter assembly is a removable filter assembly.

5. The apparatus of claim 1 wherein said at least one filter comprises a plurality of filters.

6. The apparatus of claim 5 wherein said filter assembly comprises a fitter wheel.

7. The apparatus of claim 5 wherein said filter assembly comprises a filter linear cartridge.

8. The apparatus of claim 5 further comprising:

a positioning system capable of placing a pre-selected filter from said plurality of filters in the optical path of the substantially collimated electromagnetic radiation.

9. The apparatus of claim 8 further comprising:

an input system capable of providing input data;

an input data interface component operatively connected to said input system and capable of receiving the input data;

at least one processor;

a positioning system interface component capable of providing positioning information to said positioning system; and

at least one computer readable memory having computer readable code embodied therein, said computer readable code capable of causing said at least one processor to;

receive the input data,

select said predetermined filter based on the input data, and

provide positioning information to said positioning system;

said

at least one processor said positioning system interface component and said input data interface component being operatively interconnected.

10. The apparatus of claim 9 further comprising:

a data collector interface component operatively connected to said detector and capable of receiving input data;

at least one output system;

said data collector interface component and said at least one output system being operatively interconnected with said at least one processor, said positioning system interface component and said input data interface; and

wherein said computer readable code is also capable of causing said at least one processor to;

receive detected data from said detector,

calculate predetermined characteristics from the received detected data,

organize the calculated predetermined characteristics in a predetermined ordering, and

output the organized predetermined ordering to said at least one output system.

11. A method for restricting, in an apparatus for measuring properties of microvolume liquid samples, transmission of electromagnetic radiation to a predetermined wavelength region, the method comprising the steps of:

locating a pre-selected filter in an optical path of collimated electromagnetic radiation between a sample retaining assembly and an imaging optical system;

the pre-selected filter being adjacent to the sample retaining assembly and to the imaging optical system; and

whereby the pre-selected filter substantially restricts transmission to the pre-determined wavelength region.

12. The method of claim 11 further comprising the step of selecting one filter from a filter wheel;

and, wherein the step of locating the pre-selected filter comprises the step of rotating the filter wheel to a pre-determined position.

13. The method of claim 11 further comprising the step of selecting one filter from a filter linear cartridge;

and, wherein the step of locating a pre-selected filter comprises the step of translating the filter linear cartridge to a pre-determined position.

14. A method for restricting, in an apparatus for measuring properties of microvolume liquid samples, transmission of electromagnetic radiation to a predetermined wavelength region, the method comprising the steps of:

locating a pre-selected filter in an optical path of collimated electromagnetic radiation between a transmission system capable of receiving electromagnetic radiation and directing it to a detecting system, and a sample retaining assembly capable of hold no a microvolume liquid sample and for placing the microvolume liquid sample in the optical path of collimated electromagnetic radiation;

the pre-selected filter being adjacent to the sample retaining assembly and receiving electromagnetic radiation transmitted through the microvolume liquid sample; and

whereby the pre-selected filter substantially restricts transmission to the pre-determined wavelength region.

15. The method of claim 14 further comprising the step of selecting one filter from a filter wheel;

and, wherein the step of locating a pre-selected filter comprises the step of rotating the filter wheel to a pre-determined position.

16. The method of claim 14 further comprising the step of selecting one filter from a filter linear cartridge;

and, wherein the step of placing a pre-selected filter comprises the step of translating the filter linear cartridge to a pre-determined position.

17. An apparatus comprising:

a source of electromagnetic radiation;

a first optical system;

means for providing electromagnetic radiation from said source to said first optical system;

said first optical system being capable of substantially collimating the provided electromagnetic radiation;

means for holding a microvolume liquid sample and for placing the microvolume liquid sample in an optical path of the substantially collimated electromagnetic radiation;

the substantially collimated electromagnetic radiation also being transmitted through at least a portion of said holding means;

a filter assembly comprising at least one filter, said filter assembly being positioned in the optical path of the substantially collimated electromagnetic radiation;

a second optical system capable of receiving electromagnetic radiation transmitted through the sample and said at least a portion of said sample holding assembly and through said filter assembly;

means for detecting electromagnetic radiation; and

,

means for receiving electromagnetic radiation from said second optical system and transmitting the received electromagnetic radiation to said detecting means;

said second optical system being also capable of transmitting electromagnetic radiation to said receiving/transmitting means; and

said detecting means being optical disposed to receive electromagnetic radiation from said receiving/transmitting means.

18. The apparatus of claim 17 wherein said filter assembly is located between said sample holding means and said second optical system.

19. The apparatus of claim 17 wherein said filter assembly is located between said sample holding means and said first optical system.

20. The apparatus of claim 17 wherein said filter assembly is a removable filter assembly.

21. The apparatus of claim 17 wherein said at least one filter comprises a plurality of filters.

22. The apparatus of claim 21 wherein said filter assembly comprises a filter wheel.

23. The apparatus of claim 21 wherein said filter assembly comprises a filter linear cartridge.

24. The apparatus of claim 21 further comprising:

means for placing a pre-selected filter from said plurality of filters in the optical path of the substantially collimated electromagnetic radiation.

25. The apparatus of claim 24 further comprising:

means for receiving input data;

means for selecting said predetermined filter based on the input data; and

means for providing positioning information to said positioning system.

26. The apparatus of claim 25 further comprising:

at least one output system;

means for receiving detected data from said detector;

means for calculating predetermined characteristics from the received detected data;

means for organizing the calculated predetermined characteristics in a predetermined ordering; and

means for outputting the organized predetermined ordering to said at least one output system.