Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-11-09
1992-12-29
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250226, 356338, G01N 1506
Patent
active
051754380
ABSTRACT:
A method of and an apparatus for determining the individual existence of first and second groups of particles contained in a fluid and differing in characteristics from each other that are capable of, e.g., during an automatized ion exchange operation, individually distinguishing anionic and cationic ion-exchange resin particles and capable of easily monitoring their regeneration state. A plurality of beams comprising different wavelength bands are emitted from light-emitting elements, projected onto a subject of measurement containing first and second particles, and received by light-receiving elements, and the reflectivities of the beams are measured. When the ratio of the reflectivity of a first of the beams to that of a second of the beams is above a predetermined value, the subject of measurement is determined to contain particles of the first kind, whereas when that ratio in reflectivity is below the predetermined value, the subject of measurement is determined to contain particles of the second kind.
REFERENCES:
patent: 4685802 (1987-08-01), Saito et al.
patent: 4818710 (1989-04-01), Sutherland et al.
Nelms David C.
Nikuni Machinery Industrial Co., Ltd.
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