Electricity: measuring and testing – Magnetic – Displacement
Patent
1997-11-10
2000-06-06
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Displacement
32420725, 29595, 29856, 26427216, G01R 300, H01F 4102, G01P 102, G01B 730
Patent
active
060723122
ABSTRACT:
An encapsulated transducer (10) includes an injection molded encapsulation (20) having a front end (22) and a back end (24). The encapsulation (20) is a monolith of cured moldable material ensconcing a sensing element (90) proximate the front end (22) and a portion of an information transmitting medium (120) emanating from the back end (24). A component alignment preform (40) operatively couples the sensing element (90) with the information transmitting medium or cable (120). The component alignment preform (40) includes a front ferrule (70) and a rear ferrule (80) bonded thereto and linearly spaced apart along a long axis "A". The component alignment preform (40) further includes an annular recess (44) in which the sensing element or coil (90) is placed so that it is linearly spaced and aligned along the common long axis "A" in which the front and rear ferrules (70), (80) are aligned. A first lead (98) of the coil is electrically connected to the front ferrule (70) and a second lead (100) of the coil (90) is electrically connected to the rear ferrule (80). A back end (48) of the component alignment preform (40) receives a stripped end (122) of the cable (120) such that a center conductor (126) mates with the front ferrule (70) and a coaxial conductor (130) mates with the rear ferrule (80). The respective conductors (126), (130) are electrically and mechanically connected to the pair of front and rear ferrules (70), (80). A protective sleeve (150) is then fitted over the coil (90) thereby forming a sleeved coil and cable assembly (170). This sleeved coil and cable assembly (170) is encapsulated by an injection molding process which provides the durable encapsulation (20) which bonds with itself and with the sleeved coil and cable assembly (170). The sleeved coil and cable assembly (170) is symmetrically disposed within the encapsulation (20) and the encapsulation (20) includes an integrally formed protective wall having an uniform thickness "T" along a forwardmost portion of the sensing element (90).
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Bently Nevada Corporation
DeBoo Dennis
Snow Walter E.
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