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Optical fiber acoustic wave sensor, manufacturing method and optical fiber acoustic wave sensing system

An acoustic wave sensor and acoustic wave sensing technology, applied in the field of sensing, can solve the problems of zero point drift of detection results, affect the stability of the sensor, change, etc., achieve good narrow-band filtering characteristics, suppress the phenomenon of zero point drift, and improve the effect of stability.

Active Publication Date: 2020-05-19
ZHEJIANG UNIV
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Problems solved by technology

However, the fiber optic acoustic wave sensor based on the Fabry-Perot interference cavity has the following problems: the Fabry-Perot interference spectrum is easily changed by the influence of the ambient temperature, which makes the detection result drift at zero point and affects the stability of the sensor

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  • Optical fiber acoustic wave sensor, manufacturing method and optical fiber acoustic wave sensing system
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  • Optical fiber acoustic wave sensor, manufacturing method and optical fiber acoustic wave sensing system

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Embodiment Construction

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0047] It should be noted that when an element is said to be “connected” to another element or an element is referred to as being “connected to” another element, it may be directly connected to the other element or there may be an intervening element.

[0048] The terms "first", "second", and the like in the description and claims of the embodiments of the present application and the above drawings are used to distinguish similar objects, and are not necessaril...

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Abstract

The invention relates to the technical field of sensing, and discloses an optical fiber acoustic wave sensor comprising a first single-mode optical fiber, a cladding-removed single-mode photo-thermaloptical fiber and a second single-mode optical fiber. A first fiber bragg grating is engraved on the first single-mode optical fiber, and a second fiber bragg grating is engraved on the second single-mode optical fiber; the first fiber bragg grating and the second fiber bragg grating form a Fabry-Perot interference cavity; and reflection peak wavelengths of the first fiber bragg grating and the second fiber bragg grating do not fall into the absorption band of the single-mode photo-thermal optical fiber. According to the technical scheme provided by the invention, the zero drift phenomenon canbe inhibited. Meanwhile, the invention further provides a manufacturing method of the optical fiber acoustic wave sensor and an optical fiber acoustic wave sensing system.

Description

technical field [0001] The embodiments of the present invention relate to the field of sensing technology, in particular to a fiber optic acoustic wave sensor, a manufacturing method, and a fiber optic acoustic wave sensing system. Background technique [0002] With the development of the field of sensing technology, the application of fiber optic sensors is becoming more and more extensive. Optical fiber acoustic wave sensor is the application of optical fiber sensor in the field of acoustic wave detection. Applications such as speculum and photoacoustic imaging have great prospects. [0003] At present, there are many implementation schemes of fiber optic acoustic wave sensors, among which, the fiber optic acoustic wave sensor based on Fabry-Perot (F-P, Fabry-Perot) interference cavity has become a current research hotspot because of its advantages of easy signal demodulation and high sensitivity. However, the fiber optic acoustic wave sensor based on the Fabry-Perot int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00G01D5/353
CPCG01H9/004G01D5/35312G01D5/35316G01D5/3538G01D5/35387
Inventor 吴胜楠何赛灵谢柳佳林华冠
Owner ZHEJIANG UNIV
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