Metrology instrument for measuring vertical profiles of integrat

Measuring and testing – Surface and cutting edge testing – Roughness

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G01B 528

Patent

active

041035429

ABSTRACT:
A surface profile measuring instrument, which has a stylus supported on a counterbalanced scanner arm, in turn supported in a gimbal mounting having two axes, one of which is adjustable by a servo. A connected electronics package provides axis compensation for levelling through the servo, as well as zero adjustment of a display device and discrimination against small, unwanted slops. Stylus motion is translated into an analog signal by a linear position differential transformer. To achieve slope discrimination, the analog signal is differentiated and compared in a comparator to a reference for rejection of signals corresponding to small slopes. The signal is then integrated and displayed, with reference to a selected zero of a display device.

REFERENCES:
patent: 3501949 (1970-03-01), Reason et al.
patent: 3720818 (1973-03-01), Spragg et al.
patent: 3903735 (1975-09-01), Wilson

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