Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1976-04-26
1977-05-31
Dixon, Harold A.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250491, 250492R, G01J 100
Patent
active
040271625
ABSTRACT:
Method and apparatus for orienting and measuring fibrous particles by conducting longitudinally oriented fibrous particles through a beam of radiation and measuring the radiation scattered in a direction aligned with the length of such particle and, independently, also measuring the amount of radiation scattered transverse to the length of the particle. Preferably, the measurements are accomplished utilizing a sensor having an inactive center portion substantially corresponding to the area of undisturbed beam of radiation, a first photosensitive area in a portion of the sensor aligned with the length of the particles, and a second, independent photosensitive area transverse to the length of the particle. Signals generated by the two photosensitive areas are added to determine the size of the particles, and the ratio between the signals is established to determine the aspect ratio of the particle. Preferably, the particles are aligned by conducting the particles entrained in a compressible fluid through a conduit of decreasing cross section whereby the varying flow rates across the cross section influence particles not aligned with the direction of flow. When the particles are aligned with the direction of flow, the particle is stably oriented.
REFERENCES:
patent: 2873644 (1959-02-01), Kremen et al.
patent: 3618061 (1971-11-01), Livers
patent: 3692412 (1972-09-01), Chubb
patent: 3705771 (1972-12-01), Friedman
patent: 3835315 (1974-09-01), Gravitt
patent: 3960449 (1976-06-01), Carleton et al.
Dixon Harold A.
Particle Measuring Systems, Inc.
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