G - Physics – 01 – P
Patent
G - Physics
01
P
324/48, 340/148.
G01P 3/49 (2006.01) G01H 1/00 (2006.01) G01H 9/00 (2006.01) G01L 3/00 (2006.01) G01L 5/00 (2006.01) G01P 3/44 (2006.01) G01P 3/48 (2006.01) G01P 3/481 (2006.01) G05D 13/62 (2006.01)
Patent
CA 1173906
ABSTRACT OF THE DISCLOSURE: An apparatus for detecting a rapid change in velocity of a body which rotates about a central axis, comprising a circular ring arranged in a rigid connection with and coaxially to the body. This ring has a plurality of first zones and second zones arranged alternately one after the other in the direction of rotation, these first zones, as far as a certain physical property is concerned, differing from the second zones. The apparatus further comprises a stationary transducer device including sta- tionary sensing probes effective in indicating the presence of the physical property and arranged in proximity to the outer periphery of the ring. The transducer device has an output side giving a train of transducer pulses, each transducer pulse having a period in the train which is pertinent to a corresponding group of the zones. There is also provided an oscillator delivering measuring pulses, a counter arranged to count these measuring pulses during each transducer pulse period, and a final calculating device arranged to compare a reference value with the period time of the latest produced transducer pulse. A digital register is connected to the output of the counter, and a summation device is provided with a plurality of summation units each arranged to only receive output values of the digital register which are pertinent to a corresponding group of the zones, and to combine the latest received re- gister output value with a certain number of lately received register output values for producing an average value which constitutes the above-mentioned reference value.
387749
Drechsler Jurgen
Fahlen Nils
Karlsson Sven
Asea Aktiebolag
Robic Robic & Associes/associates
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