Sensors and methods for high-sensitivity optical particle...

Details Sensors and methods for high-sensitivity optical particle... Sensors and methods for high-sensitivity optical particle...

2006-10-24

2006-10-24

Hoff, Marc S. (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Chemical analysis

C702S024000, C702S029000, C702S032000, C250S574000, C250S222200, C356S336000

Reexamination Certificate

active

07127356

ABSTRACT:
A single-particle optical sensor, which has high sensitivity and responds to relatively concentrated suspensions, uses a relatively narrow light beam to illuminate an optical sensing zone nonuniformly. The zone is smaller than the flow channel so that the sensor responds to only a fraction of the total number of particles flowing through the channel, detecting a statistically significant number of particles of any relevant diameter. Because different particle trajectories flow through different parts of the zone illuminated at different intensities, it is necessary to deconvolute the result. Two methods of deconvolution are used: modified matrix inversion or successive subtraction. Both methods use a few basis vectors measured empirically or computed from a theoretical model, and the remaining basis vectors are derived from these few. The sensor is compensated for turbidity. Several embodiments are disclosed employing light-extinction or light-scattering detection, or both.

REFERENCES:
patent: 5654797 (1997-08-01), Moreau et al.
patent: 5793478 (1998-08-01), Rader et al.
patent: 6417920 (2002-07-01), Shimaoka
Holve, Don et al. “Optical Particle Sizing for in situ Measurements: Part 1 and 2”, May 15, 1979, Applied Optics, vol. 18, No. 10, pp. 1632-1652.

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