Electromagnetic probe for measuring the thickness of skin layers

Details Electromagnetic probe for measuring the thickness of skin layers Electromagnetic probe for measuring the thickness of skin layers

1989-02-21

1991-10-01

Snow, Walter E.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

G01B 710, G01R 3312

Patent

active

050537032

ABSTRACT:
In known probes for measuring thin layers, a convex end face presses indentations into the thin layer material being measured, which can falsify the measurement result. The indentation come from the energy destroyed during application, which originates partly from the mass of the probe body and cable. In order to reduce the mass of a probe body upon impact of the probe against a thin material layer being measured as far as possible to zero, a half-pot core together with a coil is made independent and connected compliantly, but returnably, by springs to a probe body. The influence of a probe cable is eliminated by providing in the probe body an active circuit that emits at its output a coded signal that is a function of the layer thickness.

REFERENCES:
patent: 4005360 (1977-11-01), Ott

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