Device and process for interferometric sizing of particles using

Details Device and process for interferometric sizing of particles using Device and process for interferometric sizing of particles using

1996-07-05

1997-11-04

Font, Frank G.

Optics: measuring and testing

By particle light scattering

With photocell detection

356357, 356336, G01B 902

Patent

active

056845871

ABSTRACT:
An apparatus for non-contact measurement of particles, fibers and other light scattering elements includes two laser beams that intersect one another to form a measuring region within a composite flow. Particles in the flow scatter the laser energy as they traverse the measuring region. Scattered energy is received by a pair of optical detectors that generate respective electrical signals based on received energy. The detectors have selectively contoured non-rectangular apertures to controllably vary transmittance and as a result generate phase differences according to a corresponding non-linear function that relates the phase differences to particle diameters. One particularly effective aperture shape includes opposite sides contoured according to a lognormal function, to resemble an onion or tear drop. Triangular and trapezoidal apertures also can be used to achieve non-linear functions. In alternative embodiments, rectangular apertures are used in combination with energy attenuation filters with selective gradients in thickness or transmissivity. The result is a selected variance of transmittance in the detector similar to that achieved by controlling the aperture shape.

REFERENCES:
patent: 3915572 (1975-10-01), Orloff
patent: 3953128 (1976-04-01), Holly
patent: 4948257 (1990-08-01), Kaufman
patent: 4986659 (1991-01-01), Bachalo
patent: 5432605 (1995-07-01), Naqwi
patent: 5453837 (1995-09-01), Naqwi
patent: 5513004 (1996-04-01), Naqwi
Intl. Appln. No. WO 95/03524, Amir A. Naqwi, "Interferometric Cylinder Sizing and Velocimetry Device".

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