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Soil pressure sensor

An earth pressure sensor and piezoelectric film technology, applied in the field of sensors, can solve the problems of static measurement, dynamic measurement, sensitivity limitation, etc., and achieve the effects of long service life, wide frequency response, and large dynamic range.

Pending Publication Date: 2020-05-08
BUREAU OF TRAFFIC CONSTR ENG QUALITY SUPERVISE OF INNER MONGOLIA AUTONOMOUS REGION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The steel-hyun type earth pressure sensor has the disadvantages that its sensitivity is limited by the size of the pressure cell and cannot be used for dynamic testing; the resistance strain type earth pressure sensor has the disadvantages of weak output signal, large long-term creep, and cannot be used for static measurement.

Method used

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Embodiment 1

[0032] figure 1 It is a structural schematic diagram of an embodiment of the earth pressure sensor of the present invention.

[0033] Such as figure 1 As shown, the earth pressure sensor includes: a housing 1, a diaphragm 2, a PVDF piezoelectric film 3 and an output wire 5;

[0034] Wherein, the housing 1 is a cavity structure with an opening at the top, the diaphragm 2 covers the opening, the housing 1 is filled with filling liquid, and the PVDF piezoelectric film 3 is arranged on the housing. 1, suspended in the filling liquid, one end of the output wire 5 is connected to the PVDF piezoelectric film 3, and the other end extends out of the housing 1.

[0035] Wherein, the filling liquid is silicone oil 4.

[0036] Wherein, the housing 1 is in the shape of a cuboid, and the PVDF piezoelectric film 3 is arranged along the length direction of the cuboid.

[0037] Wherein, a notch is opened on the housing 1, and the notch is located on the side wall of the opening end of the ...

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Abstract

The embodiment of the invention discloses a soil pressure sensor. The soil pressure sensor comprises a shell, a diaphragm, a PVDF piezoelectric film and an output wire, wherein the shell is of a cavity structure with an opening in the top, the diaphragm covers the opening, the shell is filled with filling liquid, the PVDF piezoelectric film is arranged in the shell and suspended in the filling liquid, one end of the output wire is connected to the PVDF piezoelectric film, and the other end of the output wire extends out of the shell. The soil pressure sensor is wider in application range and high in detection precision.

Description

technical field [0001] The invention relates to the field of sensors, in particular to an earth pressure sensor. Background technique [0002] The earth pressure sensor, also known as the earth pressure cell, is mainly used to measure the soil pressure change of the buried point in soft soil and fill, and also to measure the surface contact pressure of the soil on the retaining wall, anti-slide pile, etc. At present, there are mainly two types of earth pressure sensors: steel-hyun type earth pressure and resistance strain type earth pressure. Among them, the steel-hyun type earth pressure sensor is suitable for static measurement, and the resistance strain type earth pressure is suitable for dynamic and static measurement. The steel hook type earth pressure sensor has the disadvantages that the sensitivity is limited by the size of the pressure cell and cannot be used for dynamic testing; the resistance strain type earth pressure sensor has the disadvantages of weak output s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/16
CPCG01L1/16
Inventor 张洪伟王学营叶伟何东明
Owner BUREAU OF TRAFFIC CONSTR ENG QUALITY SUPERVISE OF INNER MONGOLIA AUTONOMOUS REGION
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