Eddy current workpiece positioning apparatus

Details Eddy current workpiece positioning apparatus Eddy current workpiece positioning apparatus

1984-11-13

1985-07-02

Favors, Edward G.

Liquid heaters and vaporizers

Cleaning

Blow off

15316R, 122392, F22B 3754, F28F 1500, F28G 900

Patent

active

045261350

ABSTRACT:
A sludge lance nozzle for removing sludge from between the tubes of a nuclear steam generator includes positioning apparatus mounted on top of the nozzle. The positioning apparatus includes a cylindrical eddy-current sensor mounted inside a cup-shaped non-magnetic electrically insulating spacer, which is in turn mounted in a cup-shaped support member fixedly secured to the nozzle. The tubes are arranged in rows and columns with the axes of the tubes in each column lying in a common column plane. The nozzle is moved perpendicular to the column planes close to one of the rows of tubes. The sensor produces a maximum-amplitude output signal when the sensing axis is coplanar with the column plane of a tube in the closest row of tubes and a minimum-amplitude output signal when the sensing axis is midway between adjacent tubes in the closest row of tubes.

REFERENCES:
patent: 3831561 (1974-08-01), Yamamoto et al.
patent: 4273076 (1981-06-01), Lahoda et al.
patent: 4276856 (1981-07-01), Dent et al.
patent: 4355536 (1982-10-01), McShane et al.
patent: 4424769 (1984-01-01), Charamathieu et al.
patent: 4445465 (1984-05-01), Byrd et al.
patent: 4452183 (1984-06-01), Yazidjian

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