Needle type non-destructive metal inspection probe

Details Needle type non-destructive metal inspection probe Needle type non-destructive metal inspection probe

G - Physics

01

N

324/50

G01N 27/72 (2006.01) G01D 21/02 (2006.01) G01N 27/82 (2006.01)

Patent

CA 1098172

ABSTRACT OF THE DISCLOSURE The present invention provides a needle type non- destructive metal inspection probe comprising an outer tubular member having a central through hole of a larger diameter, an inner tubular member having a central through hole of a smaller diameter, each of the outer and inner tubular members respec- tively having a plain land portion at its rear end, a grooved land portion at its front end and an intermediate caved portion, said grooved land portions respectively having a plurality of grooves formed therein and arranged circumferencially and longi- tudinally therein, and an inspection needle core having a first conductor wound thereon and positioned within said central through hole formed in said inner tubular member, a first set of plural exciting needle cores respectively positioned in said grooves of said inner tubular member and having a second conduc- tor wound thereon, a second set of plural exciting needle cores respectively positioned in said longitudinal grooves of said outer tubular member and having another second conductor wound thereon, said first conductor being connectable to an AC power source to detect primarily wall thickness changes, said second conductors being connectable to a DC power source to induce eddy current in the material to be inspected and to magnetize it, and a cylindrical case containing said outer and inner tubular members.

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