| 摘要 |
An omega-shaped core is wrapped with two coils arranged to be responsive to magnetic permeable metal and conductive metal objects. The omega core allows the proximity sensor to operate as a saturated core sensor, a variable reluctance sensor or an eddy current loss sensor. The core is made from a thin, highly permeable metal that is preferably formed from a single piece of sheet metal, and comprises a substantially flat, rectangular member bent in four locations to form a head portion, two legs, and two feet. The bends form right angles so that the head portion is perpendicular to the two legs, and the two legs are perpendicular to the two feet. The two feet are parallel to each other and also parallel to the head portion. The core is positioned in a housing with two inductive coils, each coil being positioned around a leg portion of the core. A calibration bolt can be placed through the center of the core to change the level of inductance measured from the two inductive coils. |
