Apparatus and method for establishing the positions of metal...

Details Apparatus and method for establishing the positions of metal... Apparatus and method for establishing the positions of metal...

2007-04-10

2007-04-10

LeDynh, Bot (Department: 2862)

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

C324S244000, C324S260000

Reexamination Certificate

active

10573251

ABSTRACT:
Apparatus (10) for establishing the positions of metal objects in a mixed input stream of both metal and non-metal objects, the apparatus comprising a differential metal-detecting coil (14A) having a first coil portion wound in a first sense and a second coil portion of generally similar shape and size to the first, wound in a second sense opposite to the first sense, and conveying means (11) for moving objects with respect to, and past, the differential metal-detecting coil in a plane and in a direction with unit vector â, characterised in that the second coil portion is displaced from the first coil portion by a displacement B having a component in the plane in a direction with unit vector {circumflex over (b)}, wherein0<cos-1⁢a^·b^<π2,and in that the apparatus further comprises analysing means for analysing the form of the output voltage of the coil as a function of time to establish the position of said metal objects in a direction ĉ in the plane, where ĉ is defined by â·ĉ=0.

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International Search Report for PCT/GB2004/003953 dated Nov. 17, 2004.
GB Search Report for GB 0322224.7 dated Feb. 27, 2004.

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