Interferometric optical fiber hydrophone resisting strong electromagnetic interference and manufacturing method thereof

Abstract

The invention discloses an interferometric optical fiber hydrophone resisting strong electromagnetic interference and a manufacturing method thereof. The hydrophone comprises a hydrophone casing. A sensing coil is arranged in the hydrophone casing. One end of an optical fiber which winds around the sensing coil is connected with an external optical fiber through a first coupler. The other end of the optical fiber which winds around the sensing coil is connected with a Faraday rotation mirror through a second coupler. The sensing coil, the first coupler and the second coupler are encapsulated in a structure matrix. The hydrophone casing is made of a non-metallic material. The structure matrix is encapsulated in the hydrophone casing. The Faraday rotator mirror and the external optical fiber are located outside a measured strong electromagnetic environment. Other parts of the hydrophone are located within the measured strong electromagnetic environment. According to the interferometric optical fiber hydrophone resisting strong electromagnetic interference and the manufacturing method thereof, which are provided by the invention, the Faraday rotator mirror is moved outside the measured strong electromagnetic environment; the hydrophone is completely made of the non-metallic material; and the problem of difficult acoustic signal sensing in a high magnetic field and high electric field environment can be solved.

Description

technical field [0001] The invention relates to an optical fiber hydrophone and a manufacturing method thereof, in particular to an interference type optical fiber hydrophone resistant to strong electromagnetic interference and a manufacturing method thereof. Background technique [0002] The fiber optic hydrophone is a highly sensitive sound pressure sensor and is a member of the sonar system. Due to its advantages of corrosion resistance, no power supply, multiple parameters, easy large-scale and large-span networking, long-distance real-time monitoring, and all-weather work, it has gradually replaced the traditional piezoelectric underwater acoustic sensor system and is widely used in field of marine exploration. [0003] Traditional fiber optic hydrophones are mainly interference fiber optic hydrophones based on Michelson interferometers. figure 1 It is a traditional interference type hydrophone unit structure. In this optical path structure, the optical fiber of one ...

AI Technical Summary

Problems solved by technology

[0005] In addition to the limitations in the field of optical technology, the existing mechanical structures of fiber optic hydrophones are all made of metal, which poses a great safety hazard in a strong electromagnetic environment, such as a transformer in operation.

Images