Optics: measuring and testing – By shade or color – With color transmitting filter
Patent
1980-04-11
1981-07-14
Corbin, John K.
Optics: measuring and testing
By shade or color
With color transmitting filter
356448, G01J 348, G01N 2155
Patent
active
042783534
ABSTRACT:
Gold plated surfaces are inspected by means of reflected light in the wavelength range of 450 to 575 nanometers to give a sensitive indication of surface conditions. This test automates the visual inspection for "brown gold" and is advantageously used in continuous strip gold plating operations. The technique may be used as a quality control check or as a process control to correct non-optimum process parameters that lead to degradation of gold surface conditions. In a preferred embodiment, the reflected light from the surface being inspected is compared with light reflected from a reference surface. Alternately, a separate wavelength band, typically 700 to 800 nanometers, is reflected from the surface being inspected and compared to the reflected light in the 450 to 575 nanometer wavelength band.
REFERENCES:
patent: Re29031 (1976-11-01), Irving et al.
patent: 3327584 (1967-06-01), Kissinger
patent: 4120591 (1978-10-01), van Valkenburg
Cheh et al., "Electrochemical and Structural Aspects of Gold Electrodeposition from Dilute Solutions by Direct Current", Journal of the Electrochemical Society, vol. 118, No. 11, pp. 1737-1747, (1971).
Birth, G. S., "A Fiber Optics Reflectance Attachment", Agricultural Engineering, Aug. 1967, pp. 448, 449.
Jenkins et al., Fundamentals of Optics, N.Y., 1957, Third Edition, p. 522.
Born et al., Principles of Optics, Third (Revised Ed) p. 661.
Sard et al., "Some Properties of Electroless Gold Deposits", Plating, vol. 58, pp. 893-900 (1971).
Arnold Bruce Y.
Bell Telephone Laboratories Incorporated
Corbin John K.
Wilde Peter V. D.
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