Radiant energy – Invisible radiant energy responsive electric signalling – With means to inspect passive solid objects
Patent
1984-08-10
1986-04-15
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
With means to inspect passive solid objects
2503571, 2503581, 2503601, 250390, G01N 23222
Patent
active
045829926
ABSTRACT:
A complete PGNAA bulk material analyzer is self contained in a sealed and air conditioned housing. Bulk material is channeled by an open-ended vertical chute having a one-foot-by-three-foot cross-sectional dimension through an activation region between three neutron sources and two gamma ray detectors. The sources are symmetrically disposed on one of the three-foot long sides of the chute from one end of such side to the other. The detectors are symmetrically disposed on the opposite side of the chute between positions opposing the positions of the sources on the one side of the chute. The chute is dimensioned to enable free flow of various bulk materials. It handles coal of up to a top size of four inches and with typical surface moisture contents and agglomeration characteristics. The relative disposition of the sources and detectors results in the measurements being independent of the lateral distribution of the bulk material within the chute. The signals produced by the detectors are continuously processed by signal processing equipment sealed within a separate compartment in the container to provide periodic measurements of the elemental content of the bulk material channeled through the activation region. A measurement of the bulk material channeled through the activation region during each periodic measurement interval is processed over several measurement intervals with the periodic elemental content measurements to provide weighted average measurements of the elemental content of bulk material over time periods representing average lots of the bulk material.
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A. Cekorich, H. Deich, T. Harrington and J. H. Marshall III, "Development of an Elemental Analyzer for Coal, Oil and Similar Bulk Streams--A Status Report"0 1979 Symposium on Instrumentation and Control, Fossil Energy Processes, Denver, Co. (Aug. 1979), pp. 297-313.
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Atwell Thomas L.
Conwell Richard L.
Corte Ernesto A.
Lingren Clinton L.
Miller James F.
Callan Edward W.
Gamma-Metrics
Hannaher C.
Smith Alfred E.
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