Boots – shoes – and leggings
Patent
1990-01-02
1990-10-09
Lall, Parshotam S.
Boots, shoes, and leggings
364488, 364496, 324 715, 324600, 427 10, 437 8, 437170, G01N 2702, C23C 1454
Patent
active
049624610
ABSTRACT:
A method and apparatus for process control in both the production of uniform material layers using vapor deposition, sputtering, chemical deposition, etc. and the treating of material layers. In particular, the process and apparatus are particularly useful in semiconductor fabrication where ion implantation or diffusion is used. A brief test signal of preset shape, frequency spectrum, or frequency sequence is applied at given time intervals to the material layer whose production characteristics need to be monitored. The measuring signal is applied to a digital evaluation circuit in a process control computer. The signal has various components whose time constants and/or conductivities are different from one another and which together are characteristics of the current flowing through the layer being monitored. In particular, the current flowing over the surface layer i.sub.1, the current flowing through particle houndary areas i.sub.3, and the current through homogeneous material ranges i.sub.2 can be distinguished from one another. The results from the measuring signal can be compared to stored reference values for the layer. Discrepancies between the actual and desired values are measured and used to adjust the process in a known fashion.
REFERENCES:
patent: 3628137 (1971-12-01), Mazur
patent: 4331702 (1982-05-01), Hieber et al.
patent: 4588942 (1986-05-01), Kitahara
"Automatic Spectroscopy of Solids in the Low-Frequency Range", by U. Staudt et al., Solid State Ionic 2, No. 3, Jun. 1981, pp. 175-183.
"Measuring Contact Contamination Automatically", by Asar et al., The Western Electric Engineer, vol. 23, No. 3, Jul. 1979, pp. 32-38.
Meyer Meinhard
Stormer Oswald
Lall Parshotam S.
Messerschmitt-Bolkow-Blohm GmbH
Trans V. N.
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