Systems and methods for digital detection of a tomographic signal

US7728986B2 · kind B2 · utility

Assignees

• The Trustees of Columbia University in the City of New York · US
• The Research Foundation of the State University of New York · US

Inventors

• Joseph Lasker · Brooklyn, US
• Andreas H. Hielscher · Brooklyn, US
• James Masciotti · Germantown, US
• Christoph H. Schmitz · Brooklyn, US
• Matthew Schoenecker · Berkeley, US

Key dates

• Filing date: Oct 24, 2008
• Grant date: Jun 1, 2010
• Expiry date: Nov 29, 2028

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N21/4795
• WIPO field: Measurement
• WIPO sector: Instruments

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.