DISTRIBUTED VIBRATION SENSOR BASED ON SANYAC INTERFEROMETER WITH INCREASED ACCURACY OF IMPACT COORDINATE DETERMINATION Russian patent published in 2021 - IPC G01H9/00 G01D5/353 

FIELD: vibration detection sensors.

SUBSTANCE: distributed vibration detection sensor includes a broadband radiation source 1, the spectrum of which includes non-intersecting ranges [L1…L1'] and [L2…L2'], a wavelength splitter (WDM) 2.1, after which part of the radiation in the spectral range [L1…L1'] is directed to one loop of the Sagnac interferometer formed by a splitter 4.1 with a phase shift of 2Pi/3, WDM wavelength splitters and a fiber cable 5, and passes the path in the direct and reverse sequence, and the other part of the radiation in the spectral range [L2…L2'] is directed to the second loop formed by the 4.2 splitter with a phase shift of 2Pi/3 and WDM wavelength splitters, and passes the way in direct and reverse sequence. The radiation from the first loop will interfere in the 4.1 splitter and directed to the RR1 6.1 and RR2 6.2 radiation receivers, similarly, the radiation from the second loop interferes in the 4.2 splitter and is directed to the RR4 6.4 and RR3 6.3 radiation receivers. According to the data from all receivers, a decision on the presence of an impact is issued and its coordinate is calculated.

EFFECT: reducing the influence of errors caused by system noise, and determining the coordinates of the impact regardless of the spectrum of the recorded impact.

1 cl, 2 dwg