NSMS flight laser detector system

Details NSMS flight laser detector system NSMS flight laser detector system

2011-07-26

2011-07-26

Caputo, Lisa M (Department: 2855)

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

By loading of specimen

Reexamination Certificate

active

07984656

ABSTRACT:
A method includes rotating a rotor, measuring a rotor rotational time for the rotor to complete a revolution, determining a blade interval by dividing the rotor rotational time by a number of blades carried on the rotor, establishing an active hold-off time interval as a percentage of the blade interval time, directing a beam of light at the blades of the rotor using a laser, sensing light reflected from the blades, generating an output signal as a function of the sensed light, establishing a signal amplitude threshold, analyzing an amplitude of the output signal to trigger the active hold-off time interval when the amplitude reaches the signal amplitude threshold, and generating a blade arrival signal as a function of triggered active hold-off time intervals. The output signal is not analyzed within each active hold-off time interval.

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