Probe for measuring thin layers using a magnetic or eddy current

Details Probe for measuring thin layers using a magnetic or eddy current Probe for measuring thin layers using a magnetic or eddy current

1997-09-03

2000-01-04

Patidar, Jay M.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

33834, G01B 710, G01B 506

Patent

active

06011391&

ABSTRACT:
Measurement probe (1) is used for measuring thin layers (19) on base material (20) using a magnetic or eddy current process. On probe housing (5) above a stop for guide means (3) with measurement sensor (12) and measurement pole (13) sliding element (2) for measurement sensor (12) is guided to move in the longitudinal axis of probe housing (5) as limited by a stop. Between sliding element (2) and stop (9) on guide means (3) there is first helical spring (4) by which sliding element (2) is elastically supported relative to measurement sensor (12). Between stop (9) on guide tube (3) and lower abutment (30) on probe housing (5) is second helical spring (10) which interacts with first helical spring (4) and elastically supports measurement sensor (12) in the rest state at a distance above opening (5a) for measurement pole (13) in probe housing (5). By means of the elastic arrangement of the guide means with the measurement sensor in the probe housing between the interacting helical springs a very small load pressure of the measurement pole on the layer to be measured is achieved with the measurement sensor lowered. When measuring with the invention measurement probe, first the probe body with the probe foot is seated on the layer to be measured. Only then is the measurement sensor slowly placed on the surface by actuating the sliding element, in a damping and elastic manner. The measurement sensor withdrawn into the interior of the probe body is held in the relieved unused state of the probe and does not project above the seating surface of the probe foot.

REFERENCES:
patent: 5006799 (1991-04-01), Pfanstiehl
patent: 5053703 (1991-10-01), Fischer
patent: 5525903 (1996-06-01), Mandl et al.

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