Tilt fiber bragg grating (TFBG) liquid level change measuring instrument
A technology of tilting fiber grating and measuring instrument, which is applied in the field of sensing and achieves the effects of simple manufacturing process, low cost and good repeatability
Inactive Publication Date: 2011-05-11
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology
At present, there is no solution for sensing and analyzing signals such as liquid levels of various liquids using tilted fiber grating sensors.
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[0018] A tilted fiber grating liquid level change measuring instrument, including light source 1, two optical splitters a, b2-I, 2-II, tilted fiber grating 3, spectrum analyzer 5, two photodetectors a, b6- I, 6-II and single-mode optical fiber 7 for connection; light source 1 is connected with optical splitter a2-I through single-mode optical fiber 7, and one end of optical splitter a2-I is used as a reference arm through single-mode optical fiber 7 and photodetector a6-I is connected, and the other end is respectively connected in series with the inclined fiber grating 3 and the optical splitter b2-II through the single-mode optical fiber 7, and one end of the optical splitter b2-II is connected with the spectrum analyzer 5, and the other end is connected with the photodetector b6 -II is connected; the inclined fiber grating 3 is located at the liquid level of the measured container 4, and cannot be placed horizontally, and the upper end of the inclined fiber grating 3 must pr...
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The invention relates to a tilt fiber bragg grating (TFBG) liquid level change measuring instrument which comprises a light source, a light-way divider, a TFBG, a spectrum analyzer, a photoelectric detector and a single mode fiber for connecting, wherein the TFBG is prepared by using a phase mask side radiation technology adopting the steps of tiling a template and writing the template into a hydrogen-carrying single mode fiber through ultraviolet excimer laser; the TFBG is arranged on the liquid level of a measured container, and the upper end of the TFBG is required to extend out of the liquid level of the measured container. A TFBG sensor is used as a sensing element by the fiber liquid level measuring instrument which combines the advantages of a conventional fiber bragg grating and the intrinsic properties of the TFBG into a whole and has the advantages of low cost, simple manufacture process, high precision, good repetitiveness, and the like; and in addition, the TFBG liquid level change measuring instrument has high temperature resistance, corrosion resistance, high measurement precision, interference resistance, easy reuse and suitability for direct and continuous measurements in liquid environment with various refractive indexes.
Description
technical field [0001] The invention belongs to the sensing technology in an optical fiber liquid level change measuring instrument, in particular to an inclined optical fiber grating liquid level change measuring instrument. Background technique [0002] Fiber Bragg Grating is a new type of photonic device, which is a spatially periodic refractive index distribution established in the optical fiber, which can change and control the propagation behavior of light in the optical fiber. Tilted fiber grating is a short-period fiber grating whose grating surface has a certain tilt angle relative to the fiber axis. Slanted fiber gratings use a special writing method to write a grating at a certain angle to the fiber axis in the core of the fiber, which can couple light in a specific wavelength range from the fiber core to the fiber cladding. In a single-mode fiber, the inclination of the grating surface strengthens the coupling between the forward propagating core mode and the ba...
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IPC IPC(8): G01F23/292
Inventor 苗银萍魏臻刘波张红敏刘健盖琪
Owner TIANJIN UNIVERSITY OF TECHNOLOGY