Method of determining elements in metals by means of optical emi

Details Method of determining elements in metals by means of optical emi Method of determining elements in metals by means of optical emi

1983-11-21

1986-06-03

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

With sample excitation

G01N 2167

Patent

active

045926557

ABSTRACT:
Contents of elements in metals, e.g. aluminum in steel, which are present as a total quantity in an elemental/dissolved form and in a non-elemental or separated form, are determined by sparking the surface of the metal under an inert atmosphere. The spectral signal is simultaneously measured as a function of time, and a signal is obtained which initially exhibits an intensity peak, from which the non-elemental or separated element content can be concluded, and the signal then stabilizes at a stationary value from which the total content (C.sub.t) of element can be concluded. The elemental/dissolved proportion (C.sub.s) can be concluded from the total area (P.sub.1) below the peak, from the area (P.sub.2) under the stationary intensity measured over a time (t.sub.2 -t.sub.1) and from the total content (C.sub.t).

REFERENCES:
patent: 3248602 (1966-04-01), Irish et al.
patent: 3729259 (1973-04-01), Cooper et al.
patent: 3876306 (1975-04-01), Onodera et al.
patent: 3957373 (1976-05-01), Clarke
patent: 4326801 (1982-04-01), Ono et al.

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