Acoustic sensing system and method of acoustically monitoring a tool

摘要

An acoustic sensing system includes, an optical fiber, a plurality of pairs of reflectors distributed along the optical fiber at specific areas where acoustic energy data is sought, a source of coherent radiation in operable communication with the optical fiber, and a detector in operable communication with the optical fiber configured to detect a different wavelength of coherent radiation reflected from each of the plurality of pairs of reflectors including a portion of the coherent radiation reflected from the reflector nearer the detector after having reflected from the reflector further from the detector that define one of the pairs of reflectors.