Back to results
US 4,602,510 AGranted
Fluidic rotational speed sensor
AssigneeThe United States of America as represented by the Secretary of the Army
InventorGeorge Mon
Life of this patent
Estimating the term…
Abstract
A device for measuring the rotational speed of a rotating object in which a tream of fluid from a back pressure sensor is directed at a chopper wheel attached to the rotating object. The output of the back pressure sensor varies as the chopper wheel rotates. The number of variations in pressure per unit time is directly proportional to the rotational speed of the rotating object.
Claims6
A device for measuring the rotational speed of a rotary object comprising:
- (a) a chopper wheel attached to a rotating object, said chopper wheel having a radius of r=r.sub.1, and at least one tooth having a radius of r=r.sub.2, where r.sub.2 >r.sub.1 ;
- (b) back pressure sensor means for directing a stream of fluid at the teeth of said chopper wheel;
- (c) A tank capacitor for filtering noise in the output pressure in fluid connection with the output of said back pressure sensor means, wherein said tank capacitor produces an output wave that has a high signal to noise ratio;
- and
- (d) means for measuring the output pressure from said tank capacitor.
2 more elements
Dependencies are inferred from the claim text.