EDDY CURRENT SENSOR FOR THE NON-DESTRUCTIVE MONITORING OF METALLIZATION OF APERTURES AND PIPES, AND A PROCESS FOR PRODUCING THE SAID SENSOR

WIPO Patent Application WO/1994/025866

A1

An eddy current sensor for monitoring the metallization of apertures and narrow-gauge pipes comprises an axisymmetric body (1) elongated along the axis of symmetry, on the inner surface of which is mounted a coil in the form of a helical winding wound along the axis. The body (1) is hollow, the ratio of the outer cross section D to the inner cross section d being such that 1.4 < D/d < 1.6; this, together with the fact that the coil (3) is mounted on the inner surface of the body (1), gives the coil greater mechanical strength and helps to protect it from damage without increasing the cross sectional dimensions of the sensor. The internal space of the body (1) can be filled with a magnetoconductive material. It is expedient to provide inside the casing a central shaft (8) with a tapering plug at the end (7). The sensor is modified if there is a holder (6). The process for producing the sensor involves forming the coil on a dielectric elastic core (2) and producing the body (1) in its flat developed form; the casing is given its desired final shape after the core (2) with coil (3) has been mounted on the casing when still flat.

ULITIN YURY MIKHAILOVICH (RU)
GORSKAYA LJUDMILA EVGENIEVNA (RU)

PCT/RU1994/000095

November 10, 1994

April 28, 1994

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INTRON PLUS LTD (RU)
ULITIN YURY MIKHAILOVICH (RU)
GORSKAYA LJUDMILA EVGENIEVNA (RU)

G01N27/90; (IPC1-7): G01N27/90

WO1982000523A1

1982-02-18

US3988665A	1976-10-26
US3840802A	1974-10-08

See also references of EP 0657735A4

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