Fiber Fabry-Perot sonic probe device and manufacturing method thereof

Abstract

The invention relates to the fields of fiber technology, optical engineering and material engineering, and particularly to a fiber Fabry-Perot sonic probe device and a manufacturing method thereof. According to the fiber Fabry-Perot sonic probe device, parallel transmission and reflection of outlet light beams are realized through a graded-index multimode fiber, and receiving rate of light which is reflected by a graphene film is improved. The metal-doped graphene film improves light reflection rate. The fiber Fabry-Perot sonic probe device and the manufacturing method settle a problem of relatively low probe sensitivity caused by film thickness increase for improving reflectivity of the graphene film, and realizing high-sensitivity detection for an acoustic signal. The fiber Fabry-Perot sonic probe device has advantages of simple manufacture, small size, high sensitivity, high electromagnetic interference resistance, etc. The fiber Fabry-Perot sonic probe device can be widely applied in the field of safety defense monitoring, underwater monitoring, medical science, biomedical engineering, etc.

Description

technical field [0001] The invention relates to the technical fields of optical fiber technology, optical engineering, and material engineering, and in particular to an optical fiber FAP acoustic wave probe device and a manufacturing method thereof, which are based on a metal-doped graphene film. Background technique [0002] As a very important optical structure, the optical fiber Fab cavity is widely used in precision instruments, industrial production, communication, sensing and other fields due to its small size, low cost, easy integration, and many advantages of long-distance signal transmission. [0003] The traditional optical fiber FAP acoustic wave probe is generally composed of a capillary glass tube, a single-mode optical fiber and a vibrating diaphragm. One end of the capillary glass tube is coated with a vibrating diaphragm, and the other end is inserted into an optical fiber. A reflective surface and air as the cavity medium. For fiber optic acoustic probes wi...

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Problems solved by technology

For graphene pressure sensors, Jin Wei et al. made intrinsic graphene film fiber-tip pressure sensor with graphenediaphragm in 2012 (see: Jun Ma, WeiJin, Hoi Lut Ho, et al. High-sensitivity fiber-tip pressure sensor with graphenediaphragm [J]. Optics letters, 2012,13(37):2493-2495.), and in 2014, an extrinsic graphene film optical fiber F-Per interference sensor was produced (see: Jun Ma, Wei Jin, HaifengXuan, et al .Fiber-opticferrule-top nanomechanical resonator with multilayer graphene film[J].Opticsletters,2014,16(39):4769-4772.), they all use the single-mode fiber end face and graphene film as the reflective surface, and the outgoing light There is a large exit divergence angle at the end face of the single-mode fiber, so that only a small part of the light reflected by the graphene film can return to the single-mode fiber, resulting in unequal intensities of the two reflected beams that merge and make the contrast of the interference fringes not good. High, in order to improve the contrast of interference fringes, multi-layer graphene film is used to improve the reflectivity of graphene film, but as the thickness of graphene film increases, it will inevitably lead to a decrease in detection sensitivity to external pressure or acoustic signals

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