ALEXANDRIA, Va., May 26 -- United States Patent no. 12,638,314, issued on May 26.
"Signal processing methods for an optical detection system" was invented by Stuart Russell (Pill, Great Britain) and Andris Egle (Pill, Great Britain).
According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is a signal processing method for a distributed acoustic sensing system (DAS), including receiving a set of scattered signals, each of which was scattered at a different location along an optical path and corresponds to a respective spatial channel. Each scattered signal is interfered with a local oscillator signal, and processed to generate a complex carrier signal whose modulation is related to an instantaneous frequency o...