Radiant energy – Invisible radiant energy responsive electric signalling – With means to inspect passive solid objects
Patent
1977-12-02
1980-01-29
Anderson, Bruce C.
Radiant energy
Invisible radiant energy responsive electric signalling
With means to inspect passive solid objects
250432R, 250433, G01M 2300
Patent
active
041863062
ABSTRACT:
A perlite expander control system is disclosed in which a source of and detector for penetrating radiation are used to determine the density of an expanded perlite product flowing through a conduit. The density of the perlite product will be inversely proportional to the amount of penetrating radiation transmitted to the detector. A signal generated by the detector in response to the amount of transmitted radiation received is processed in appropriate circuitry to control the feed of raw perlite ore to the expander, thus resulting in the correct amount of ore being fed to the expander per unit time to result in obtaining the desired degree of perlite expansion. Typically beta, gamma or X radiation of various energies may be used as the penetrating radiation.
REFERENCES:
patent: 2979649 (1961-04-01), Leighton
patent: 4044259 (1977-08-01), Wyton et al.
"Use Radioactive Instruments", Stewart et al., Control Eng., Mar. 1955, pp. 50-56.
"Encyclopedia of Instrumentation and Control", Considine, 1971, pp. 191-193, 685-689, and 744.
Colwell Richard R.
Necker Carl G.
Anderson Bruce C.
Johns-Manville Corporation
Kelly Joseph J.
Krone Robert M.
McClain James W.
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