Optics: measuring and testing – By light interference – For dimensional measurement
Reexamination Certificate
2008-10-24
2010-06-01
Connolly, Patrick J (Department: 2877)
Optics: measuring and testing
By light interference
For dimensional measurement
C356S479000
Reexamination Certificate
active
07728986
ABSTRACT:
Systems and methods for digital detection of an analog tomographic signal are described. The methods include receiving an amplitude-modulated analog signal containing tomographic information, the analog signal having a modulation frequency, fλi; and converting the analog signal into a digital signal at a sampling frequency, fs, to produce a number of samples, K. The digital signal is multiplied by an in-phase reference signal to obtain an in-phase signal component, the in-phase reference signal having the frequency, fλi; and the digital signal is multiplied by a quadrature reference signal to obtain a quadrature signal component, the quadrature reference signal having the frequency, fλi. The in-phase signal component and the quadrature signal component are passed through the K-point averaging filter. A signal amplitude is computed based on the filtered in-phase signal component and the filtered quadrature signal component, the signal amplitude being representative of the tomographic information.
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Hielscher Andreas H.
Lasker Joseph M.
Masciotti James
Schmitz Christoph H.
Schoenecker Matthew
Connolly Patrick J
The Research Foundation of State University of New York
The Trustees of Columbia University in the City of New York
Wilmer Cutler Pickering Hale and Dorr LLP
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