Speed measurement system

Details Speed measurement system Speed measurement system

G - Physics

01

P

73/62

G01P 3/44 (2006.01) G01P 3/489 (2006.01)

Patent

CA 1189723

ABSTRACT A speed measurement system including a magnetic pickup posi- tioned in proximate relation to a driven element of a gas turbine engine having a plurality of discontinuities therein. The pickup providing a pulse per every discontinuity and thus a multiplicity of pulses for every revolution of the driven element. Conditioning circuitry connected to the pickup for generating a strobe pulse signal for every discontinuity. Interval measuring circuitry receiving interval signals asynchronous to the strobe pulses of a predetermined period which are to form a measurement period which is exactly related to a count of the strobe pulses over a measurement period. Addition- ally included is circuitry used to lengthen the measurement period up to a maximum of N intervals for increasing the low frequency response of the system.

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