OPTICAL ANALYSIS SYSTEM AND METHOD FOR REAL TIME MULTIVARIATE OPTICAL COMPUTING

• US 20090097024A1
• Filed: 11/27/2006
• Published: 04/16/2009
• Est. Priority Date: 11/28/2005
• Status: Active Grant

• Current Assignee: Halliburton Energy Services Incorporated (Halliburton Company)
• Original Assignee: Halliburton Energy Services Incorporated (Halliburton Company)
• Inventors: Blackburn, John C., Freese, Robert P., Perkins, David L.
• Granted Patent: US 8,154,726 B2
• Time in Patent Office: Days
• US Class Current: 356/303
• CPC Class Codes: G01J 3/02 Details
• CPC Class Codes: G01J 3/0205 Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
• CPC Class Codes: G01J 3/021 using plane or convex mirrors, parallel phase plates, or particular reflectors
• CPC Class Codes: G01J 3/0232 using shutters
• CPC Class Codes: G01J 3/0291 Housings; Spectrometer accessories; Spatial arrangement of elements, e.g. folded path arrangements
• CPC Class Codes: G01J 3/08 Beam switching arrangements
• CPC Class Codes: G01J 3/28 Investigating the spectrum using colour filters G01J3/51
• CPC Class Codes: G01J 3/36 Investigating two or more bands of a spectrum by separate detectors
• CPC Class Codes: G01N 21/274 Calibration, base line adjustment, drift correction
• 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

An optical analysis system and method for determining information carried by light include a multivariate optical element disposed in the system to receive a source light from an illumination source; filtering the source light through a spectral element in the optical element analysis system; reflecting the filtered light through an inner region of a cavity in a first direction of a sample to be measured, the cavity defining a second region disposed about the inner region; focusing the reflected light proximate the sample; reflecting the focused light from the sample through the second region in a second direction of a beamsplitter, the light being reflected from the sample carrying data from the sample; splitting the sample carrying light with the beamsplitter into a first light and a second light; optically filtering the data of the first light with the multivariate optical element into an orthogonal component; directing the first light filtered by the multivariate optical element onto a first photodetector; directing the second light onto a second photodetector; and comparing the orthogonal component to information present in the second light to determine a property of the sample.

Claims

1. A method of determining information carried by light using a multivariate optical analysis system, the method comprising:

filtering a source light through a spectral element;

reflecting the filtered light through an inner region of a cavity in a first direction of a sample to be measured, the cavity defining a second region disposed about the inner region;

focusing the reflected light proximate the sample;

reflecting the focused light from the sample through the second region in a second direction of a beamsplitter, the light being reflected from the sample carrying data from the sample;

splitting the sample carrying light with the beamsplitter into a first light and a second light;

optically filtering the data of the first light with a multivariate optical element into an orthogonal component;

directing the first light filtered by the multivariate optical element onto a first photodetector;

directing the second light onto a second photodetector; and

comparing the orthogonal component to information present in the second light to determine a property of the sample.

2. The method as in claim 1, wherein the light is focused in the sample, the light having a focal point about 0 mm to about 5 mm in the sample.

3. The method as in claim 1, wherein the beamsplitter is a 50/50 beamsplitter.

4. The method as in claim 1, further comprising modulating the light.

5. The method as in claim 1, further comprising modulating the light from about 50 Hz to about 5000 Hz.

6. The method as in claim 1, further comprising controlling a spectral range of the light source, the spectral element having a predetermined transmission characteristic for controlling the spectral range.

7. The method as in claim 1, further comprising measuring a concentration of the sample using a ratio of the first light and the second light.

8. The method as in claim 1, further comprising monitoring the first light, the second light or combinations thereof to assess particle segregation of the sample.

9. The method as in claim 1, further comprising monitoring the first light, the second light or combinations thereof to assess density of the sample.

10. The method as in claim 1, further comprising monitoring the first light, the second light or combinations thereof to assess affect of particle size in the sample.

11. The method as in claim 1, further comprising monitoring the first light, the second light or combinations thereof to measure a chemical in the sample.

12. The method as in claim 1, further comprising monitoring the first light, the second light or combinations thereof to measure homogeneity of the sample.

13. The method as in claim 1, further comprising preparing a chemometric model of the light reflected from the sample.

14. A method of determining information carried by light, the method comprising:

determining a plurality of orthogonal components of a first portion of a light signal, wherein each of the components has a predetermined shape with respect to a property of the first portion of the light signal that varies over a predetermined wavelength range;

determining respective weightings for the orthogonal components so that the magnitude of the orthogonal components in the first portion of the light signal, weighted by the weightings, is proportional to information present in the first portion in a predetermined relationship;

disposing an optical filter mechanism to receive the first portion of the light signal, the optical filter mechanism configured to optically filter the orthogonal components;

disposing a detector to receive a second portion of the light signal;

detecting the property of the first portion of the light signal filtered by the optical filter mechanism;

receiving the second portion of the light signal with the detector; and

analyzing the sample in real time by comparing the property of the first portion of the light signal to information in the second portion of the light signal.

15. An optical analysis system for determining information carried by light, the 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 cavity in communication with the spectral element, the cavity being configured to direct the first light in a direction of the sample, the sample reflecting the first light as a second light, the cavity being further configured to direct the 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.

16. The optical analysis system as in claim 15, wherein the cavity includes a first region and a second region, the first region being configured to direct the second light in a direction of the beamsplitter, the second region being configured to direct the first light in a direction of the sample.

17. The optical analysis system as in claim 15, wherein the optical filter mechanism is a multivariate optical element.

18. The optical analysis system as in claim 15, further comprising a gain mechanism in communication with at least one of the optical filter mechanism, the first detector mechanism and the second detector mechanism, the gain mechanism being configured to weight a magnitude of the property of the light orthogonal component.

19. The optical analysis system as in claim 15, further comprising a mirror disposed proximate the cavity, the mirror being to direct the first light in the cavity in the direction of the sample.

20. An optical analysis system, comprising:

a multivariate optical filter disposed to receive a light from a light source and configured to optically filter data from a sample carried by the light into at least one orthogonal component of the light;

a detector mechanism in operative communication with the optical filter mechanism to measure a property of the at least one orthogonal component to measure the data from the sample;

a spectrograph device disposed relative to the light source and the filter mechanism such that the spectrograph device directs the light from the light source to the filter mechanism, the spectrograph device being configured to separate the light into a spectrum; and

analyzing the sample in real time by comparing the one orthogonal component of the light relative to information in a second component of the light.