Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1997-03-17
1999-06-01
Turner, Samuel A.
Optics: measuring and testing
By particle light scattering
With photocell detection
356357, G01B 902
Patent
active
059092793
ABSTRACT:
A dual time delay interferometer (TDI) enables remote sensing of phase modulated information, such as the detection of ultrasonic vibrations from highly diffuse surfaces, preferably in the range from about 10 kHz to 100 MHZ or more. The system can also be configured in a transceive mode with a dual pass through a single TDI, which is well suited to optical communications. A non-steady-state photo-electromotive-force detector tracks the movement of interference fringes (whose position shifts as the surface vibrates), rather than their absolute position. A phased array of the sensors can be used for enhanced imaging applications requiring better signal
oise ratios, or alternatively, when lower power optical sources are employed.
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Dunning Gilmore J.
O'Meara Thomas R.
Pepper David M.
Duraiswamy V. D.
Hughes Electronics Corporation
Sales M. W.
Turner Samuel A.
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