A system for detecting the position of sound source using optical fiber

Abstract

The invention belongs to the field of optical fiber sensing and signal processing technologies and particularly provides a system for detecting the position of a sound source by using optical fibers. The system comprises a broad spectrum light source, an optical fiber interference system, a sensing optical fiber, a photoelectric detector, a data acquisition card and a signal processing platform. The sensing optical fiber forms a fiber-optic acoustic sensor array by using a full optical fiber sensing probe, and realizes the simultaneous collection of multi-path optical signals through the wavelength division multiplexing process. The light emitted from the light source is input into the optical fiber interference system. A signal applied onto the sensing optical fiber is interfered by the interference system and then is collected by a computer after being detected by the photoelectric detector. The signal processing platform processes the received acoustic signal to obtain the position information of the sound source, and then displays the position coordinates of the sound source. The fiber-optic acoustic sensor array is composed of a Sagnac loop-based interference light path, or a feedback-based interference light path. According to the technical scheme of the invention, the system can determine the position of the sound source, and has the advantages of wide detectable sound frequency band, anti-electromagnetic interference, corrosion resistance and the like. The system can be used for detecting low-altitude flying objects, underwater submarines and the like.

Description

technical field

[0001] The invention belongs to the technical field of optical fiber sensing and signal processing, and in particular relates to a system for detecting the position of a sound source by using an optical fiber. Background technique

[0002] In recent years, radars have faced threats such as electronic jamming, anti-radiation missiles, low-altitude penetration and stealth technologies. Low-altitude flying targets such as armed helicopters and precision-guided cruise missiles can operate in radar blind spots at altitudes below 150m. Conventional ground radars have inherent weaknesses in detecting low-altitude targets, making it difficult for radar-controlled air defense systems to function effectively. pose a serious threat. On May 2, 2011, the United States used four stealth armed helicopters flying at ultra-low altitude to go deep into Pakistan to kill bin Laden, which is enough to prove the effectiveness of ultra-low altitude penetration. Faced with the thr...

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