Method and arrangement using a pair of resonant circuits for det

Details Method and arrangement using a pair of resonant circuits for det Method and arrangement using a pair of resonant circuits for det

1982-03-10

1985-03-26

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

324 61R, 324237, G01N 2782, G01R 2726

Patent

active

045076081

ABSTRACT:
Method for determining the position and depth of unevenness in an inner surface of a pipe with the aid of a scanning head which is adapted to travel through the pipe and which is rotatable about the pipe axis. The invention provides an inductive, or capacitive, depth scanning process, which operates in a contact-free manner with respect to the inner pipe surface. This is attained by means of an inductive method in that, as is illustrated in the drawing, there is arranged at a distance from the pipe inner surface the scanning head which is guided and in which a coil (2) of a measuring, resonant circuit is mounted and, above the inner periphery of the pipe, a coil 1 of a reference, resonant circuit is arranged, and then, after the frequencies of both resonant circuits have been brought, prior to measuring, to an identical value in each of a multiplying circuit (10, 7, 13 respectively 11, 8, 14), they are measured and converted into an adjustable difference of the multiplied frequencies (f.sub.1, f.sub.2) in an analog-digital converter (18) and conducted to a microprocessor ( 19) as a signal with respect to the unevenness, and from there are conducted to an evaluation unit (20). With the capacitative depth scanning method, the frequency difference is attained by adjusting the capacity of the resonant circuits.

REFERENCES:
patent: 2684464 (1954-07-01), Hastings et al.
patent: 2963644 (1960-12-01), Nuttall
patent: 3238448 (1966-03-01), Wood et al.
patent: 3443211 (1969-05-01), Wood et al.
patent: 3460034 (1969-08-01), Tanner
patent: 3543145 (1970-11-01), Dufayet
patent: 3823365 (1974-07-01), Anderson
patent: 3835374 (1974-09-01), Frost
Jupe, John H., Crack Detector for Production Testing Electronics, Oct. 1945, pp. 114, 115.

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