ALEXANDRIA, Va., Dec. 2 -- United States Patent no. 12,487,117, issued on Dec. 2.
"Signal processing methods for an optical detection system" was invented by Stuart Russell (Bristol, Great Britain) and Andrew Weld (Bristol, Great Britain).
According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed are signal processing methods for an optical detection system, and corresponding systems. An example is a signal processing method for a distributed acoustic sensing system which utilizes spread spectrum pulses transmitted along an optical path, where a scattered signal that was scattered at a scattering location along an optical path is received and interfered with a local oscillator signal to generate a first carrier...