Real time FPGA resampling for swept source optical coherence tomography

US10393502B2 · kind B2 · utility

Assignee

• Axsun Technologies, Inc. · US

Inventors

• Bartley C. Johnson · North Andover, US
• Noble G. Larson · Arlington, US
• Brian Goldberg · Ladera Ranch, US
• Mark E. Kuznetsov · Lexington, US

Key dates

• Filing date: Jul 27, 2015
• Grant date: Aug 27, 2019
• Expiry date: Mar 25, 2037

Classification

• Technology area (CPC G): Physics
• CPC primary: G01B2290/60
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Real-time swept source OCT data is most often sampled using a specially cut hardware k-clock. The present invention involves mathematically resampling signals within an FPGA-based data acquisition board based on data sampled from a wide free spectral range reference interferometer. The FPGA can then multiply up the reference clock rate to achieve greater imaging depth. The Nyquist fold-over depth can thus be programmed from a standard reference to an arbitrary depth, much as PLL frequency synthesizer can produce many frequencies from a standard stable reference. The system is also capable of real-time performance.