Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1975-02-03
1976-02-17
Smith, Alfred E.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356187, G01J 330
Patent
active
039388883
ABSTRACT:
A net spectral intensity signal is derived from a comparison between the absolute spectral intensity of the signal interest and the intensity of a spectral continuum on which it rides. To derive the net signal, a pivotal refractor plate is mounted over the exit slit of a standard 1-meter monochromator. Pivoting of the plate produces a quick shift from the peak to its baseline signal. A programming circuit synchronizes the pivotal action with rotatably-indexed sample changer having a plural number of sample holders. The changer includes a fixed valve plate communicating with the capillary feed of a flame-emission burner and a rotatably-indexed plate having a plurality of ports each carrying a hypodermic needle for aspirating the test sample into the burner when the plate ports are mated. Repeated burnings are conducted for each sample both at the peak line and that of the spectral continuum and a multiplicity (300) of instantaneous digital signals are taken for each burning. A calculator computes an average and a standard deviation based upon the repeated burnings and upon the 300 instaneous signals.
REFERENCES:
patent: 3802782 (1974-04-01), Natelson
Folsom et al., Applied Spectroscopy, Vol. 22, No. 2, Mar./Apr. 1968, pp. -114.
Folsom et al., Applied Spectroscopy, Vol. 24, No. 3, May/June 1970, pp. 378 and 379.
Folsom Theodore R.
Parks, Jr. Gerald J.
Weitz, Jr. William E.
Critchlow Paul N.
Evans F. L.
Sciascia Richard S.
Smith Alfred E.
The United States of America as represented by the Secretary of
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