Metrological apparatus and calibration method therefor

Details Metrological apparatus and calibration method therefor Metrological apparatus and calibration method therefor

1990-06-22

1992-09-22

Lall, Parshotam S.

Boots, shoes, and leggings

364560, 33551, H03M 106, G01D 534

Patent

active

051503140

ABSTRACT:
A metrological apparatus for measuring form and texture of a surface employs an inductive transducer producing an AC gauge signal, and a tracking AC analogue to digital converter. In order to avoid errors in the output signal at a relatively high speed of traverse of the surface due to a non-flat frequency response of the converter, the output signal is processed by a digital filter to provide a combined frequency response which is flat over a desired range. In order to avoid errors in the output signal due to non-linearity of the transducer, a square or cubic correction is applied to the signal. A method calibrating the apparatus to obtain coefficients for the square and cube terms in the correction process is also described.

REFERENCES:
patent: 4377911 (1983-03-01), Iida et al.
patent: 4588979 (1986-05-01), Adams
patent: 4736208 (1988-04-01), Schmidt
patent: 4800364 (1989-01-01), Mortara
patent: 4807152 (1989-02-01), Lane et al.
patent: 4849916 (1989-07-01), Abbe et al.
patent: 4896282 (1990-01-01), Orwell
patent: 4912397 (1990-03-01), Gale et al.
patent: 5063291 (1991-11-01), Buehring

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