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Magnetofluid filling photonic crystal optical fiber F-P magnetic field sensor

A technology of photonic crystal fiber and magnetic field sensor, which is applied in the direction of using magneto-optical equipment for magnetic field measurement, cladding fiber, optical waveguide and light guide, etc., to achieve the effect of simple instrument structure, novel design, and reduced impact

Inactive Publication Date: 2011-10-19
NORTHEASTERN UNIV
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Problems solved by technology

This method uses the mechanical deformation of the diaphragm to cause the change of the length of the enamel cavity, and the influence of the elastic properties of the diaphragm will have a certain impact on the repeatability of the sensor.

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  • Magnetofluid filling photonic crystal optical fiber F-P magnetic field sensor
  • Magnetofluid filling photonic crystal optical fiber F-P magnetic field sensor
  • Magnetofluid filling photonic crystal optical fiber F-P magnetic field sensor

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Embodiment Construction

[0014] The specific structure, principle and measurement process of the present invention will be further described below in conjunction with the accompanying drawings.

[0015] The F-P magnetic field sensor based on ferrofluid-filled hollow-core photonic crystal fiber consists of a hollow-core photonic crystal fiber (HC-PCF) and a standard single-mode fiber (SMF), such as figure 1 shown. As a reflective sensor design structure, a total reflection mirror is pasted on one end of the photonic crystal fiber, and the other end is passed through a partially reflective Ti 2 o 3 The film is fused with the single-mode optical fiber to form a reflective optical fiber F-P interference cavity structure.

[0016] The purpose of placing a partial reflection film between the hollow-core photonic crystal fiber and the single-mode fiber is to increase the light reflection effect here. For a fiber optic F-P sensor, the contrast of the interference fringe signal plays a crucial role in pract...

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Abstract

The invention discloses a magnetofluid filling photonic crystal optical fiber F-P magnetic field sensor, which belongs to the technical field of optical fiber sensing, and consists of a broadband light source 20, an optical fiber coupler 21 and optical fiber links (31, 32, 33 and 34) of the optical fiber coupler 21, a refractive index matching fluid 22, a sensor probe 23, an electromagnetic coil 18 and a current driving system 19 of the electromagnetic coil, a spectrum analyzer, a computer 24 as well as a connecting cable 26 and a connecting cable 27. The magnetofluid filling photonic crystal optical fiber F-P magnetic field sensor is characterized in that the sensor probe is formed by fusing a section of hollow photonic crystal optical fiber 12 filled with a magnetofluid 13 and a simple module optical fiber 11; the two ends of the hollow photonic crystal optical fiber are respectively stuck by a partial reflection film 14 and a total reflection mirror 15 to form an optical fiber F-P interferometric cavity structure; and the reflection rate of the magnetofluid serving as a medium in the F-P interferometric cavity is changed due to a magnetic field generated by the electromagnetic coil after conducted with a current, thereby causing the change of output spectrums so as to realize magnetic field measurement. The magnetofluid filling photonic crystal optical fiber F-P magnetic field sensor has the advantages of being low in temperature influences, simple in structure, small in size and easy to realize multi-point distribution type sense.

Description

technical field [0001] The invention relates to a magnetic fluid filled photonic crystal fiber F-P magnetic field sensor, which belongs to the technical field of optical fiber sensing. Background technique [0002] Optical fiber magnetic field sensors are generally a relatively advanced magnetic field detection technology that is realized by using some magneto-optical sensitive materials or magneto-optical effects combined with the characteristics of the optical fiber itself. (L.Sun, S.Jiang, and J.R.Marciante, All-fiber optical magnetic-field sensor based on Faraday rotation in highly terbium-doped fiber, OPTICS EXPRESS, 18(6), 2010) based on the Faraday rotation optical effect using a 2cm long A fiber-optic magnetic field sensor is realized by using a Tb-doped fiber as a Faraday rotation device and combining a section of Corning SP1060 single-polarization fiber as a fiber polarizer. (M.Yang, J.Dai, C.Zhou, D.Jiang, Optical fiber magnetic field sensors with TbDyFe magnetic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/032G02B6/02
Inventor 赵勇张亚男
Owner NORTHEASTERN UNIV
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