Optics: measuring and testing – Standard
Patent
1986-07-18
1988-07-05
Evans, F. L.
Optics: measuring and testing
Standard
G01J 102
Patent
active
047550503
ABSTRACT:
According to the invention there is provided a standard for monitoring the calibration of optical line width measuring machines which includes an opaque sheet having two spaced apart slots. Preferably, the sheet material is a metal such as chromium deposited on a transparent substrate.
REFERENCES:
patent: 4055376 (1977-10-01), Daberko
Swyt, Solid State Technology, vol. 21, No. 1, Jan. 1978, pp. 34-42.
Evans F. L.
FitzGerald Thomas R.
Heiting Leo N.
Sharp Melvin
Texas Instruments Incorporated
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