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AssigneeThe United States of America as represented by the Secretary of the Air Force
InventorFrank O. Clark
Estimating the term…
An optical detector senses the intensity of scattered light reflected by a surface coupled to a vibration source. If the vibration source is operating, the coupled surface vibrates at the same frequency. Incident light reflected by the surface is modulated by the vibration at a hypertemporal frequency. The detector produces a direct electrical current as a temporal function of the detected modulated light intensity. A transimpedance amplifier converts the current into a voltage. A voltage amplifier amplifies the voltage. An analog-to-digital converter converts the amplified voltage into digital signal. A digital signal processor converts the digital signal into a function of power spectral density and frequency using Fourier transform and principle component analyses. The vibration signature of the vibration source, if present, is discerned from a graphical display of the foregoing function.
An apparatus using modulated light for sensing vibration of a surface, comprising:
An apparatus for detecting a vibration signature using modulated light, comprising:
A method for discerning a vibration signature using modulated light, comprising:
Dependencies are inferred from the claim text.