Method for monitoring cracks and critical concentration by using

Details Method for monitoring cracks and critical concentration by using Method for monitoring cracks and critical concentration by using

1992-10-27

1997-03-18

Wieder, Kenneth A.

Electricity: measuring and testing

Electrolyte properties

Using a conductivity determining device

324700, 324709, 324718, 204404, 2057755, 205777, 2057915, G01N 2720

Patent

active

056126212

ABSTRACT:
A method for monitoring cracks in a sample of materials by applying the theory that the phase angle increases in the sample of materials being tested where cracks have formed. The method is performed by preparing a solution capable of forming cracks in the sample, preparing an auxiliary electrode, then making the sample and the auxiliary electrode contact with the solution, preparing a frequency generator connecting the sample and the auxiliary electrode respectively, choosing a frequency, and turning on the frequency generator with an alternating current of the frequency, monitoring the phase angle measured in the sample, and determining the formation of cracks in the sample by checking whether the phase angle measured in the sample increases with time. Similarly, a method for monitoring the critical concentration of a solution can be obtained by gradually increasing the concentration of the solution and repeating the above mentioned steps, until an increase in the phase angle measured in the sample is found.

REFERENCES:
patent: 3661748 (1972-05-01), Blackmer
patent: 4266185 (1981-05-01), Charlesworth
patent: 4683419 (1987-07-01), Neuelmann
patent: 4777444 (1988-10-01), Beijk
patent: 4881031 (1989-11-01), Pfisterer
patent: 5059905 (1991-10-01), Drits
patent: 5184071 (1993-02-01), Tasca

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