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Passive optical fiber grating submarine sound signal sensor and making method thereof

A technology of underwater acoustic signal and passive optical fiber, which is applied in the direction of using optical devices to transmit sensing components, transducers and instruments used underwater, and can solve the problems of difficult detection of underwater acoustic signals, low sensitivity of underwater acoustic sensors, and pressure sensitivity. Low-level problems, to achieve the effect of strong anti-interference ability, small structure, and expanded application field or scope

Inactive Publication Date: 2008-02-06
李智忠
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Problems solved by technology

However, due to the low pressure sensitivity of fiber Bragg grating itself, the underwater acoustic sensor directly made of fiber Bragg grating has low sensitivity and is difficult to detect underwater acoustic signals. Therefore, it is necessary to study a new type of high-sensitivity fiber Bragg grating underwater acoustic sensor. of

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  • Passive optical fiber grating submarine sound signal sensor and making method thereof
  • Passive optical fiber grating submarine sound signal sensor and making method thereof

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Embodiment Construction

[0023] As shown in Fig. 1, Fig. 2 and Fig. 3, the simplest structure of the present invention, it is provided with two hollow bodies 3 of center symmetrical distribution inside a polymer encapsulation body 2, and this hollow body 3 two ends are sealed, one A fiber grating 5 passes through and is fixed on the axis of the polymer package 2 .

[0024] The base 1 is flat or disc-shaped, and the polymer package 2 is embedded in it, and the two are connected by high-strength adhesive.

[0025] There are pigtails at both ends of the fiber grating, and one end of the pigtail passes through the thin through hole in the center of the base, and is used to connect the optical system; the other end is free, or can be used as an array complex of multiple fiber grating hydrophones. Channels are used, and the pigtails 4 of the fiber gratings 5 ​​are sequentially connected in series or in parallel to form an array.

[0026] Further, the pigtail 4 at one end of the fiber grating 5 passes throu...

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Abstract

The present invention relates to a passive optical fiber grating underwater acoustic signal sensor and a manufacture method. Two cavity bodies being distributed by the central symmetrical way is arranged inside a polymer encapsulation body, the both ends of the cavity body are sealed, and an optical fiber grating is threaded through and fixed at the axle line position of the polymer encapsulation body. The polymer encapsulation body is a columnar body, the cross section of the cavity body can be circular, elliptic, quadrate or D-shaped. The manufacturing method is that firstly, a die is made according to the structure of the polymer encapsulation body, an optical fiber grating is fixed into the die, and then a polymer is heated to be the molten state and slowly poured into the die, finally the optical fiber grating polymer encapsulation body is arranged into a warm box to be solidified and aged. The present invention is characterized in that the sensitivity of the acoustic pressure is high, the passive optical fiber grating underwater acoustic signal sensor is three to four magnitude orders higher than the underwater acoustic sensor directly made of optical fiber grating, the characteristics of light mass, small structure, and high sensitivity are fully realized, thus the present invention has important application prospect in the underwater acoustic detection field.

Description

technical field [0001] The invention belongs to the technical field of fiber grating sensing, in particular to a passive fiber grating underwater acoustic signal sensor and a manufacturing method thereof. Background technique [0002] At present, various underwater acoustic transducers or underwater acoustic signal sensors have very important application value in the detection of marine acoustic environment, the detection of target acoustic characteristics, and the study of submarine acoustic characteristics. However, due to the shortcomings of the current underwater acoustic sensor, such as large volume, low sensitivity, and short operating distance, it can no longer meet the needs of further development in related fields. [0003] Recently, the underwater acoustic sensor made of fiber grating has the advantages of light weight and small structure, which can realize the potential miniaturized probe structure, has very good anti-acceleration performance index and anti-flow n...

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Application Information

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IPC IPC(8): G01H9/00G01D5/353H04R1/44
Inventor 李智忠程玉胜胡永明刘启军
Owner 李智忠
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