Weighing a number of objects in succession

Details Weighing a number of objects in succession Weighing a number of objects in succession

G - Physics

01

G

265/6

G01G 23/18 (2006.01) G01B 7/00 (2006.01) G01G 9/00 (2006.01)

Patent

CA 1268787

ABSTRACT Weighing a number of objects in succession To weigh objects in quick succession, the objects are projected with a known horizontal velocity onto a ramp which has a surface which curves down through 90°. The ramp can move horizontally in response to the impul6e corresponding to the change in horizontal momentum of the object. A transducer senses the movement of the ramp and the output horizontal velocity of the object is sensed, enabling the change in horizontal velocity to be calculated. The mass of the object is calculated from the horizontal movement of the ramp and the change in horizontal velocity of the object. In order to obtain accurate sensing of the movement of the ramp, the transducer is a linear variable differential transformer having a primary winding energised by a cyclical carrier signal and two matched secondary windings in series; the secondary winding output signal is rectified to a corresponding DC voltage having ripple components, and a sample is taken of the signal at the zero voltage of the principal ripple component.

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