Device for non-destructive eddy current inspection of a hole formed in a conductive part
View Patent ↗Using eddy currents to inspect a hole that is possibly not rectilinear and/or of section that is not circular. The inspection device comprises a stick shaped and dimensioned to be capable of being engaged in said hole, at least one arm hinged to a support fastened to one end of the stick, an eddy current sensor being embedded in said arm, and resilient means for urging the arm outwards against the inside surface of the hole.
1. A device for non-destruction eddy current inspection of a hole formed in a conductive part, the device being configured to explore said hole by broaching without rotation, the device comprising a stick shaped and dimensioned to be capable of being engaged in said hole, and comprising:
at least one hinged arm in a vicinity of one end of said stick and including a curved outside face;
an eddy current sensor embedded in said arm in a vicinity of said curved outside face; and
resilient means for urging said hinged arm outwards, wherein said hinged arm is in sliding contact with an inside surface of the hole, said sliding contact taking place in the vicinity of the curved outside face of said sensor.
2. A device according to claim 1 , for inspecting a curvilinear hole, wherein said stick is curved, with curvature corresponding to the curvature of the hole.
3. An inspection device according to claim 1 , wherein said stick carries at least two of said hinged arms, in opposition.
4. A device according to claim 3 , wherein said stick carries a plurality of pairs of said hinged arms.
5. A device according to claim 1 , wherein the or each arm is hinged on a pin to a support secured to said stick, and wherein a spring is installed between said stick and said arm, in order to push the arm outwards.
6. A device according to claim 1 , wherein the or each sensor is covered in resin.
7. A device according to claim 1 , wherein a front guide part is placed at the end of said stick, said guide part having an outline corresponding to the section of said hole.
8. A device according to claim 1 , wherein a rear guide part is fastened to said stick, behind said arm(s), said rear guide part having an outline corresponding to the section of said hole.
9. A kit for performing eddy current inspection of a hole formed in a conductive part, the kit comprising a plurality of inspection devices according to claim 1 , the devices differing from one another by the positions of the hinged arms they carry relative to the section of the hole.