Particle classification employing plane polarized radiation appl

Details Particle classification employing plane polarized radiation appl Particle classification employing plane polarized radiation appl

1990-10-19

1992-06-23

Harvey, Jack B.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Distributive type parameters

324631, 209576, G01N 2200, B07C 500

Patent

active

051246627

ABSTRACT:
In the method, particles (16) are classified by locating them in a resonance cavity (10) and applying a swept range of microwave radiation to the cavity. The transmitted signals are detected and analyzed. The particle is then assigned to a classification in accordance with changes in the dielectric characteristics of the cavity as a result of the presence of the particle. The radiation is polarized and is applied in at least two mutually orthogonal directions. With the particle located at the center of the cavity, where the E-field is a maximum, and with signals propagating in at least two mutually orthogonal direction, account is taken of dimensional and orientational inaccuracies from particle to particle.

REFERENCES:
patent: 3458808 (1969-07-01), Agdur
patent: 4885527 (1989-12-01), Lacombe et al.
patent: 4899100 (1990-02-01), Talanker et al.

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