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All-optical fiber real-time measurement tiltmeter based on Bragg grating

A technology of real-time measurement and inclinometer, which is applied in the direction of measuring inclination, measuring devices, instruments, etc., can solve the problems of large size of the device, error of measurement results, inaccurate measurement results, etc., and achieve high measurement accuracy, simple structure, and high sensitivity. high effect

Active Publication Date: 2014-02-19
CHONGQING UNIV
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Problems solved by technology

[0003] The existing fiber optic inclinometer is mainly composed of a measuring fiber equipped with a fiber Bragg grating and a tilt transmission mechanism with a mechanical structure. The sensing part on the inclined transmission mechanism will move, and the axial length of the measuring fiber will change due to the transmission of the sensing part, so that the center wavelength of the fiber Bragg grating will drift, and the drift of the center wavelength will be calculated by demodulation processing The measurement of the tilt amount can be realized; the existing problems are: 1) The demodulation processing is troublesome: when the prior art is performing demodulation processing, it is necessary to first convert the wavelength drift into a chang

Method used

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  • All-optical fiber real-time measurement tiltmeter based on Bragg grating
  • All-optical fiber real-time measurement tiltmeter based on Bragg grating
  • All-optical fiber real-time measurement tiltmeter based on Bragg grating

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Embodiment Construction

[0014] An all-fiber real-time measuring inclinometer based on a Bragg grating, its structure is: the inclinometer is composed of an input fiber section 1, a detection fiber section 2 and a vertical weight section 3; a fiber Bragg grating is arranged in the detection fiber section 2 One end of the detection fiber section 2 is connected to the input fiber section 1, and the other end of the detection fiber section 2 is connected to the vertical weight section 3; the input fiber section 1 is used to guide the detection light into the detection fiber section 2.

[0015] Further, the vertical weight section 3 is composed of a hollow fiber and a filler, and the filler is filled in the inner hole of the hollow fiber; the end of the hollow fiber is connected with the detection fiber section 2 .

[0016] Further, tin blocks are used as the filler.

[0017] Further, the outer diameter of the detection fiber segment 2 is smaller than the outer diameter of the input fiber segment 1 .

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Abstract

The invention relates to an all-optical fiber real-time measurement tiltmeter based on Bragg grating. The all-optical fiber real-time measurement tiltmeter based on Bragg grating is characterized in that the tiltmeter comprises an input optical fiber segment, a detection optical fiber segment and a vertical segment, Bragg optical fiber grating is arranged inside the detection optical fiber segment, one end of the detection optical fiber segment is connected with the input optical fiber segment, the other end of the detection optical fiber segment is connected with the vertical segment, and the input optical fiber segment is provided for importing detection light into the detection optical fiber segment. The all-optical fiber real-time measurement tiltmeter has beneficial effects of simple structure, small size, high sensitivity, high measurement accuracy, no requirement of mechanical transmission structure, and independence of temperature variation.

Description

technical field [0001] The invention relates to a device for measuring inclination, in particular to an all-fiber real-time measuring inclinometer based on Bragg gratings. Background technique [0002] Tilt measurement plays an important role in the quality dynamic monitoring of large buildings (such as tall buildings, bridges and dams, and large mechanical equipment). Compared with electrical inclinometers, optical fiber-based inclinometers have unique advantages such as small size, high sensitivity, and anti-electromagnetic interference. [0003] The existing fiber optic inclinometer is mainly composed of a measuring fiber equipped with a fiber Bragg grating and a tilt transmission mechanism with a mechanical structure. The sensing part on the inclined transmission mechanism will move, and the axial length of the measuring fiber will change due to the transmission of the sensing part, so that the center wavelength of the fiber Bragg grating will drift, and the drift o...

Claims

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Application Information

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IPC IPC(8): G01C9/00G01D5/353
CPCG01C9/12G01C2009/066
Inventor 朱涛张强
Owner CHONGQING UNIV
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