Microprobe

Details Microprobe Microprobe

1989-08-04

1990-09-11

Kaplan, G. L.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

G01N 2726

Patent

active

049560743

ABSTRACT:
Measuring instruments for coulometrically measuring the thickness of metallic coatings pump the electrolyte from the first chamber 11 into the second chamber 12 and vice versa during the measurement. As a result, fresh electrolyte constantly reaches the measuring spot below the outlet orifice 7 and the troublesome formation of gas bubbles at this measuring spot is completely or substantially reduced. If the probe 3 is, however, inadvertently lifted off the coating 2, the pumped electrolyte spurts at high speed out of the outlet orifice 7. As a result, personnel and also material may suffer damage. The disposal presents difficulties. As a solution, provision is made for the entire system to employ underpressure and the maximum pressure occurring in chamber 11 or 12 is less than the external pressure. If the probe 3 is now inadvertently lifted during the measurement process, the electrolyte is sucked back into the first chamber 11 and/or the second chamber 12 and nothing is contaminated.

REFERENCES:
patent: 4310389 (1982-01-01), Harbulak
patent: 4488938 (1984-12-01), Jirovsky et al.
patent: 4560464 (1985-12-01), Lieber

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