Pulse detection circuit
AssigneeGeneral Electric Company
InventorsMark P. Tarricone, John M. Gambale, Roger A. Martin
Life of this patent
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Abstract
A pulse detection circuit detects one different pulse within a string of similar pulses for a once per revolution index. The pulse detection circuit comprises a DC averaging means for generating a first threshold voltage from a raw signal. An average comparator receives the first threshold voltage and generates a first output voltage indicative of signal amplitude of the raw signal, as compared to the first threshold voltage. A zero comparator receives the raw signal, compares it to zero, and generates a second output voltage indicative of a pulse. The first and second output voltages are input to a logic sequence to generate a logic output when the one different pulse within the string of similar pulses is detected.
Claims10
A pulse detection circuit for detecting one different pulse within a string of similar pulses for a once per revolution index, the pulse detection circuit comprising:
- a DC averaging means for generating a first threshold voltage from a raw signal;
- an average comparator for receiving the first threshold voltage and generating a first output voltage indicative of signal amplitude of the raw signal, as compared to the first threshold voltage;
- a zero comparator for receiving the raw signal, comparing the raw signal to zero, and generating a second output voltage indicative of a pulse;
- a logic sequence for receiving as inputs the first and second output voltages to generate a logic output when the one different pulse within a string of similar pulses is detected.
A pulse detection circuit for detecting a low pulse within a string of higher pulses in a once per revolution index for balancing a gas turbine engine fan module having a toothed gear with one small tooth that stays in the same relation to the fan, the pulse detection circuit comprising:
- a DC averaging means for generating a first threshold voltage from a raw fan speed signal;
- an average comparator for receiving the first threshold voltage and generating a logic HIGH signal for each generated pulse which exceeds the first threshold voltage;
- a zero comparator for receiving the raw fan speed signal, comparing the raw fan speed signal to zero, and triggering for every detected pulse;
- a logic sequence for generating a logic HIGH output at an instant when the zero comparator triggers to indicate a pulse and the average comparator indicates an amplitude less than the first threshold voltage.
Dependencies are inferred from the claim text.