Optical analysis systems and methods for dynamic, high-speed detection and real-time multivariate optical computing

• US 7,623,233 B2
• Filed: 03/02/2007
• Issued: 11/24/2009
• Est. Priority Date: 03/10/2006
• Status: Active Grant

• Current Assignee: Halliburton Energy Services Incorporated (Halliburton Company)
• Original Assignee: Ometric Corp. (Halliburton Company)
• Inventors: James, Jonathan H., Blackburn, John C., Priore, Ryan J., Freese, Robert P., Perkins, David L.
• Primary Examiner(s): Lauchman; Layla G
• Application Number:
  US11/681,270
• Publication Number:
  US 20090002697A1
• Time in Patent Office: 998 Days
• Field of Search: 356300-307, 356/417, 356/317, 356/318, 356/39, 250/226
• US Class Current: 356/303
• CPC Class Codes: G01J 3/02 Details
• CPC Class Codes: G01J 3/021 using plane or convex mirrors, parallel phase plates, or particular reflectors
• CPC Class Codes: G01J 3/42 Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry beam switching arrangements G01J3/08
• 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 2201/1293 resolving multicomponent spectra

Abstract

Multivariate optical analysis systems employ multivariate optical elements and utilize multivariate optical computing methods to determine information about a product carried by light reflected from or transmitted through the product. One method of processing and monitoring the product includes introducing the product at an inspection point; illuminating the product with a spectral-specific light though an optic lens; directing the light that has passed through at least a section of the product through at least one multivariate optical element to produce a first signal, the directed light carrying information about the product; detecting the first signal at a first detector; deflecting a portion of the directed light to produce a second signal in a direction of a second detector, the second detector configured to detect the second signal; and determining at least one property of the product at a rate of about one section of the product per second to about five sections of the product per second based upon the detector outputs.

Claims

1. An optical analysis system, comprising:

a light source being configured to radiate a first light along a first ray path;

a modulator disposed in the first ray path, the modulator being configured to modulate the first light to a desired frequency;

a spectral element disposed proximate the modulator, the spectral element being configured to filter the first light for a spectral range of interest of a sample, the first light being directed into the sample;

a retroreflector being configured to convert the first light from the sample into a second light;

a beamsplitter being configured to split the second light into a first beam and a second beam;

an optical filter mechanism disposed to receive the first beam, the optical filter mechanism being configured to optically filter data carried by the first beam into at least one orthogonal component of the first beam;

a first detector mechanism in communication with the optical filter mechanism to measure a property of the orthogonal component to measure the data; and

a second detector mechanism being configured to receive the second beam for comparison of the property of the orthogonal component to the second beam.

2. The optical analysis system as in claim 1, wherein the retroreflector includes a coating of gold or aluminum.

3. The optical analysis system as in claim 1, wherein the retroreflector is a collimating mirror being configured to diffuse the first light into the second light.

4. The optical analysis system as in claim 1, wherein the retroreflector is a conical mirror.

5. The optical analysis system as in claim 1, wherein the sample is substantially transparent.

6. The optical analysis system as in claim 1, wherein the sample is a liquid.

7. The optical analysis system as in claim 1, further comprising a cavity in communication with the spectral element, the cavity being configured to direct the first light in a direction of the sample.

8. The optical analysis system as in claim 7, wherein the cavity is further configured to direct the second light.

9. An optical analysis system, comprising:

a light source being configured to radiate a first light along a first ray path;

a modulator disposed in the first ray path, the modulator being configured to modulate the first light to a desired frequency;

a spectral element disposed proximate the modulator, the spectral element being configured to filter the first light for a spectral range of interest of a sample;

a light diversion path for diverting the first light into the sample, the first light being transmitted through the sample and emerging as a second light;

a beamsplitter being configured to split the second light into a first beam and a second beam;

an optical filter mechanism disposed to receive the first beam, the optical filter mechanism being configured to optically filter data carried by the first beam into at least one orthogonal component of the first beam;

a first detector mechanism in communication with the optical filter mechanism to measure a property of the orthogonal component to measure the data; and

a second detector mechanism being configured to receive the second beam for comparison of the property of the orthogonal component to the second beam.

10. The optical analysis system as in claim 9, wherein the light diversion path includes a fiber-optic cable or a plurality of mirrors.

11. A method of high-speed processing and monitoring, comprising:

moving a product past an inspection point;

illuminating at least a section of the product with a light;

directing the light that has passed through the section and is carrying information about the product through at least one multivariate optical element to produce a first signal;

deflecting a portion of the light to produce a second signal;

detecting the first signal at a first detector;

detecting the second signal at a second detector; and

determining at least one property of the product based upon the detector outputs as the product moves past the inspection point at a rate of about one section per second to about five sections per second.

12. The method as in claim 11, wherein the product is one of a solid product, a liquid product or a gas product.

13. The method as in claim 12, wherein the solid product is a pharmaceutical tablet or a pharmaceutical powder.

14. The method as in claim 11, wherein the product is an emulsion.

15. The method as in claim 11, wherein the product is a solution.

16. The method as in claim 11, wherein the product is a mixture.

17. The method as in claim 11, wherein an illumination source for the light is disposed proximate the section of the product and the light that has passed through the section is reflected from the section in a direction of the detectors.

18. The method as in claim 11, wherein an illumination source for the light is disposed proximate the product and the light that has passed through the section transmits through the product in a direction of the detectors.

19. The method as in claim 18, further comprising diverting a part of the light from the illumination source into the product along a light diversion path.

20. The method as in claim 19, wherein the light diversion path includes a fiber-optic cable.

21. The method as in claim 18, further comprising diffusing the light that has passed through the section before the light is directed to the multivariate optical element.

22. The method as in claim 19, wherein the light is diffused by a collimating mirror.

23. A method of processing and monitoring a product, the method comprising:

introducing a product at an inspection point;

illuminating the product with a spectral-specific light though an optic lens;

directing the light that has passed through at least a section of the product through at least one multivariate optical element to produce a first signal, the directed light carrying information about the product;

detecting the first signal at a first detector;

deflecting a portion of the directed light to produce a second signal in a direction of a second detector, the second detector configured to detect the second signal; and

determining at least one property of the product at a rate of about one section of the product per second to about five sections of the product per second based upon the detector outputs.

24. The method as in claim 23, wherein the product is a pharmaceutical tablet or a quantity of pharmaceutical powder.

25. The method as in claim 23, wherein the product is one of a solid product, a liquid product or a gas product.

26. The method as in claim 23, wherein the product is disposed in a closed container, the container at least partially transparent to light focused onto the product.

27. The method as in claim 23, further comprising moving the product past the inspection point.

28. The method as in claim 23, further comprising moving the optic lens past the product.