Fiber grating earth pressure sensor

An earth pressure sensor and fiber grating technology, which is applied in the direction of measuring force by measuring the change of optical properties of materials when they are stressed, can solve the problems of complex structure, unsatisfactory accuracy and difficult realization of the fiber grating earth pressure sensor. Achieve the effect of avoiding chirp phenomenon, concentrated force and large range

Active Publication Date: 2012-05-30
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
  • Fiber grating earth pressure sensor

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Embodiment Construction

[0019] see figure 1 , a fiber grating earth pressure sensor, comprising a sensor housing 3, a pressure transmission component 5 located in the sensor housing, and a fiber grating 7 capable of producing wavelength changes under the action of the pressure transmission component. The above-mentioned sensor housing 3 is a cylindrical housing, which is provided with a bottom plate and a pressure-bearing top cover 1, and 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 of the sensor housing 3 In the trapezoidal groove 4 opened above, the pressure-bearing roof 1 is installed on the elastic rubber pad 2, and the pressure-bearing roof 1 is supported by the elastic rubber pad 2. This technical means can make the earth pressure accepted by the pressure-bearing roof completely It acts on the pressure transmission parts to make the force more concentrated and ensure that its deformation more accurately refl...

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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 an optical fiber grating earth pressure sensor, which is suitable for buried earth pressure measurement, such as force detection and monitoring of rock soil, side slope, concrete, road, building and the like. Background technique [0002] At present, sensors used for pressure monitoring of rock soil, 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 that the resistance strain gauge produces mechanical deformation under the action of earth pressure, and its resistance value changes. It can measure both static and dynamic earth pressure. Its disadvantages It is sensitive to temperature, poor long-term stability, weak output signal and large nonlinearity for large strain. [0004] The vibrating wire earth pressure sensor uses the p...

Claims

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Application Information

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Patent Type & Authority Patents(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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