Systems and methods for continuous, on-line, real-time surveillance of particles in a fluid

• US 20050151968A1
• Filed: 01/10/2005
• Published: 07/14/2005
• Est. Priority Date: 01/08/2004
• Status: Abandoned Application

• Current Assignee: LXT Group (JMAR Technologies, Inc.)
• Original Assignee: LXT Group (JMAR Technologies, Inc.)
• Inventors: Quist, Gregory M., Drake, David A.
• Application Number:
  US11/032,473
• Publication Number:
  US 20050151968A1
• Time in Patent Office: Days
• US Class Current: 356/338
• CPC Class Codes: G01N 15/0211 Investigating a scatter or diffraction pattern
• CPC Class Codes: G01N 15/1434 Optical arrangements
• CPC Class Codes: G01N 2015/019 Biological contaminants; Fouling
• CPC Class Codes: G01N 2015/0233 using holography
• CPC Class Codes: G01N 2021/0118 Apparatus with remote processing
• CPC Class Codes: G01N 21/53 within a flowing fluid, e.g. smoke
• CPC Class Codes: G01N 21/85 Investigating moving fluids or granular solids
• CPC Class Codes: G01N 33/1826 Organic contamination in water

Abstract

Disclosed herein are systems and methods for the continuous, on-line, real-time surveillance (CORTS) of microorganisms/particles. In one embodiment, a system comprises an optical illuminator for directing a light along a beam axis and onto a particle. In addition, the system comprises an angular amplifier configured to receive light scattered in a plurality of directions by the particle, and to minimize the angular dispersion of the scattered light with respect to the beam axis. The system also comprises an optical detector configured to receive at least a portion of the scattered light from the angular amplifier. A method of identifying particles comprises directing a light along a beam axis and onto a particle, and receiving light scattered in a plurality of directions by the particle. The method further comprises minimizing the angular dispersion of the scattered light with respect to the beam axis, and detecting at least a portion of the scattered light after minimizing the angular dispersion of the beam.

Claims

1. A system for identifying particles, the system comprising:

an optical illuminator for directing a light along a beam axis and onto a particle;

an angular amplifier configured to receive light scattered in a plurality of directions by the particle, and to minimize the angular dispersion of the scattered light with respect to the beam axis;

an optical detector configured to receive at least a portion of the scattered light from the angular amplifier.

2. A system according to claim 1, further comprising a collimator positioned between the angular amplifier and the optical detector, and configured to collimate the portion of the scattered light before reaching the optical detector.

3. A system according to claim 1, further comprising a zone plate lens configured to direct a portion of the scattered light from the angular amplifier to the optical detector.

4. A system according to claim 1, wherein the zone plate lens comprises a holographic optical element.

5. A system according to claim 4, wherein the holographic optical element comprises at least one active holographic component configured to direct a portion of the scattered light toward the optical detector.

6. A system according to claim 3, wherein the zone plate lens is a diffractive optical element.

7. A system according to claim 3, wherein the zone plate lens is a refractive optical element.

8. A system according to claim 1, wherein the optical detector comprises a plurality of photodetectors.

9. A system according to claim 8, wherein the plurality of photodetectors comprises a linear array of photodiodes.

10. A system according to claim 9, wherein the array of photodiodes is a charge coupled device.

11. A system according to claim 1, further comprising a data acquisition and signal processing subsystem coupled to the optical detector and configured to identify the particle using the scattered light received by the optical detector.

12. A system according to claim 11, further comprising a communication subsystem coupled to the data acquisition and signal processing system and configured to communicate the identification of the particle outside the system.

13. A system according the claim 12, wherein the communication subsystem provides a warning to an interested party.

14. A system according to claim 1, further comprising a water flow cell having a detect zone within which the particle receives the light directed from the optical illuminator.

15. A system according to claim 1, wherein the angular amplifier comprises a solid transparent block.

16. A system according to claim 15, wherein the transparent block comprises a refractive index between about 1.5 and about 2.4.

17. A system according to claim 1, wherein the optical illuminator is a laser, and the directed light is a laser beam.

18. A system according to claim 17, wherein the laser is polarized.

19. A system according to claim 17, wherein the laser is unpolarized.

20. A method of identifying particles, the method comprising:

directing a light along a beam axis and onto a particle;

receiving light scattered in a plurality of directions by the particle;

minimizing the angular dispersion of the scattered light with respect to the beam axis;

detecting at least a portion of the scattered light.

21. A method according to claim 20, further comprising collimating the detected scattered light.

22. A method according to claim 20, further comprising directing the scattered light after the minimization of the angular dispersion to facilitate the detecting.

23. A method according to claim 20, further comprising directing the scattered light with a holographic optical element.

24. A method according to claim 23, wherein the holographic optical element comprises at least one active holographic component configured to direct a portion of the scattered light toward the optical detector.

25. A method according to claim 22, further comprising directing the scattered light using a diffractive optical element.

26. A method according to claim 22, further comprising directing the scattered light using a refractive optical element.

27. A method according to claim 20, further comprising detecting the at least a portion of the scattered light with a plurality of photodetectors.

28. A method according to claim 27, wherein the plurality of photodetectors comprises a linear array of photodiodes.

29. A method according to claim 28, wherein the array of photodiodes is a charge coupled device.

30. A method according to claim 20, further comprising identifying the particle using the detected scattered light.

31. A method according to claim 30, further comprising communicating the identification of the particle.

32. A method according to claim 20, further comprising minimizing the angular dispersion of the scattered light with respect to the beam axis by passing light scattered by the particle through a solid transparent block.

33. A method according to claim 32, wherein the transparent block comprises a refractive index between about 1.5 and about 2.4.