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Fiber grating earth pressure sensor

A technology of earth pressure sensor and fiber Bragg grating, which is applied in the direction of measuring the change force of the optical properties of the material when it is stressed, can solve the problems of complex structure, unsatisfactory accuracy and difficult realization of the fiber grating earth pressure sensor. Achieve the effects of avoiding chirp phenomenon, concentrated force and large measuring range

Active Publication Date: 2011-08-24
青岛飞博科技有限公司
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Problems solved by technology

[0006] In order to solve the problems of complex structure, large volume, difficult realization, unsatisfactory range and precision of the above-mentioned fiber grating earth pressure sensor, the present invention provides a fiber grating earth pressure sensor

Method used

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  • Fiber grating earth pressure sensor
  • Fiber grating earth pressure sensor

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Embodiment Construction

[0019] see figure 1 , a fiber grating earth pressure sensor, including a sensor housing 3, a pressure transmission component 5 located in the sensor housing, and a fiber grating 7 capable of generating wavelength changes under the action of the pressure transmission component. The above-mentioned sensor housing 3 is a cylindrical housing with a bottom plate and a pressure-bearing top cover 1 , an elastic rubber pad 2 is arranged on the top of the sensor housing 3 , and the elastic rubber pad 2 is placed on the top inner wall surface of the sensor housing 3 . In the trapezoidal groove 4 opened on the top, the pressure-bearing top cover 1 is installed on the elastic rubber pad 2, and the pressure-bearing top cover 1 is supported by the elastic rubber pad 2. This technical means can make the earth pressure received by the pressure-bearing roof cover completely. It acts on the pressure transmission component to make its force more concentrated, and ensures that its deformation acc...

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Abstract

The invention discloses a fiber grating earth pressure sensor which comprises a sensor shell, a pressure transmission component and a fiber grating. The earth pressure sensor is characterized in that the pressure transmission component is of a rhombus structure, and the is positioned between a bearing-type top cover and a bottom plate, and is in contact with the bearing-type top cover and the bottom plate; clearances are arranged among the pressure transmission component and the left side and the right side of the sensor shell; a grating is pasted on a metal elastic membrane; the metal elastic membrane is arranged on a transverse diagonal line between a left angle and a right angle of the pressure transmission component; and two sides of the metal elastic membrane are fixed on the left angle and the right angle of the pressure transmission component. The earth pressure sensor provided by the invention has the characteristics of large measuring span, high accuracy and simple structure, is good for miniaturization of the integral structure.

Description

technical field [0001] The invention relates to a fiber grating earth pressure sensor, which is suitable for embedded earth pressure measurement, such as force detection and monitoring of rock, slope, concrete, roads and buildings. Background technique [0002] At present, sensors for pressure monitoring of geotechnical, concrete, etc. are classified according to their working principles, mainly including resistance strain type, vibrating wire type and fiber grating type. [0003] The resistance strain type earth pressure sensor is made by the resistance strain effect of mechanical deformation of the resistance strain gauge under the action of earth pressure, and its resistance value changes. It can measure both static and dynamic earth pressure. Its shortcomings It is sensitive to temperature, poor long-term stability, weak output signal and large nonlinearity for large strains. [0004] The vibrating wire earth pressure sensor uses the principle that the steel string has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/24
Inventor 李丽君曹茂永马伟红曹惠于国亮马辉张勇
Owner 青岛飞博科技有限公司
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