A pressure measuring device of fiber grating

A fiber grating and measuring device technology, which is applied in the measurement of the changing force of the optical properties of the material when the material is under stress, the use of diffractive elements to generate spectrum, spectrum generation and other directions, which can solve the problem of large volume, poor long-term stability and slow response speed. and other problems, to achieve the effect of high measurement accuracy and large measuring range

Inactive Publication Date: 2009-03-04
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

The mechanical and hydraulic mine pressure observation instruments are simple in structure, reliable in operation, and low in cost, but have disadvantages such as slow response speed, low precision, and large volume; the resistance strain sensor is based on the mechanical deformation of the metal wire under the action of external force. , and its resistance value changes due to the resistance strain effect. It is more sensitive and accurate than mechanical and hydraulic sensors, but this type of sensor has disadvantages such as sensitivity to temperature and poor long-term stability; the vibrating wire sensor is at 80 It was successfully developed and applied in the early 1990s. It uses the principle of steel strings with different fixed frequencies under different tensions to realize force detection. It is currently the most commonly used instrument in mine pressure detection, but this type of sensor still exists. Defects such as low precision and slow response speed

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  • A pressure measuring device of fiber grating
  • A pressure measuring device of fiber grating
  • A pressure measuring device of fiber grating

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Embodiment Construction

[0012] The present invention will be described in further detail below in conjunction with accompanying drawing, as figure 1 As shown, a piston-liquid-piston mechanical structure for fixing the sensing part of the fiber grating is produced. The connected step hole 3, the step hole 3 is provided with an upper piston 4 and a lower piston 5, the cross-sectional area of ​​the upper piston 4 is larger than that of the lower piston 5, and the upper piston 4 and the lower piston 5 are filled with hydraulic oil 6, The lower end of the lower piston 5 is spherical, and the top surface of the chamber 2 is centered on the central axis of the stepped hole 3, and protrudes downward to form a boss 21. The boss 21 is sleeved with a cylindrical elastic membrane 7, and the lower piston The lower end of the 5 can be in contact with the elastic mode 7; the fiber grating is engraved, and the passive temperature compensation method of the fiber grating is studied to produce a high-precision, high-s...

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Abstract

The present invention discloses one kind of pressure-measuring fiber grating process and device. After linear conversion of the measured force in a 'piston-liquid-piston' converter in the conversion ratio equal to the upper and the lower piston area ratio, the converted force is transmitted by the lower piston to the fiber grating with relatively small measuring range. The change in force causes the axial strain in the fiber grating, and change of fiber grating in parameters, including Bragg wavelength. After the mathematic model between the pressure and the central wavelength of the grating, measuring the wavelength can obtain the corresponding pressure. The present invention has the advantages of great measurement range, high precision, etc.

Description

technical field [0001] The invention relates to a mine pressure detection instrument, in particular to a mine pressure detection instrument with a large range and high precision. Background technique [0002] In the process of coal mining, the mechanical balance between rock mass and coal seam is destroyed, and "mine pressure" is formed around the mining face, also known as "roof pressure". The roof accident is the collapse of the roadway or the working face due to the collapse of the support under the pressure of the roof, which can easily cause casualties. The number of casualties caused by roof accidents accounts for about one-third of the number of casualties in coal mine production accidents in my country, and ranks first in excess of the death toll in gas accidents. At present, the main instruments used for mine pressure detection can be divided into mechanical type, hydraulic type, resistance strain type, vibrating wire type, etc. according to their working principle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/24G01J3/18
Inventor 曹茂永李丽君孙农亮李晶范迪梁慧斌
Owner SHANDONG UNIV OF SCI & TECH
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