A three-way pressure sensor based on dodecahedron

Abstract

The invention discloses a regular-dodecahedron pressure sensor, and the pressure sensor comprises a box body (1), and the box body (1) is a dodecahedron. The six adjacent surfaces of the box body (1) are stress surfaces (2), and each two organic polymer cylinders (3) are disposed between each stress surface (2) and a corresponding opposite surface in a clamping manner. The organic polymer cylinders (3) are respectively provided with a spiral micro-channel (5), and the interior of each spiral micro-channel (5) is filled with liquid metal. The liquid metal in the spiral micro-channels (5) achieve feed through a coaxial cable 4. The sensor measures the pressure of soil or rock through an antenna frequency receiving device, and achieves the remote monitoring and measurement of the pressure condition of the soil or rock. The pressure sensor is advantageous in that the sensor can measure six stress components at a time with no need of angle adjustment, is simple and convenient in operation, and improves the measurement precision; and the pressure sensor can monitor three-direction pressure remotely in real time, and improves the detection accuracy and reliability.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering pressure testing, and in particular relates to a three-way pressure sensor. Background technique [0002] The three-dimensional stress test of rock-soil mass or concrete mass in civil engineering is a basic work in engineering and the basis for engineering safety design and evaluation. In particular, the ability to accurately measure the three-dimensional stress state and realize real-time remote monitoring plays a fundamental and important role in infrastructure projects such as civil engineering, water conservancy engineering, and transportation engineering. [0003] At present, most of the existing pressure testing devices in the field of civil engineering stress testing can only test the pressure in one direction, and only a few pressure testing devices can test the stress state in three directions. Chinese patent documents CN102620870A and CN104075944A disclose several three-...

AI Technical Summary

Problems solved by technology

However, after a comprehensive comparison, it is found that there are several problems in the existing three-way pressure testing devices: 1. The existing three-way pressure testing devices are mainly based on sensor-type or vibrating wire earth pressure cells, and the accuracy of such test devices is not enough High, susceptible to electromagnetic interference, not large enough in range, and poor in long-term stability; 2. The existing three-way pressure test devices are wired to transmit test data, and the test depth is not deep enough to allow remote testing; 3. The existing three-way pressure test None of the pressure testing devices can perform long-term, real-time remote monitoring; 4. The existing three-way pressure testing device uses two identical instruments to obtain six components at different angles. The operation is complicated and the angle control is not accurate, which makes the test accuracy not high.

[0005]1), this patent can only test pressure in one direction, not three directions;

[0006]2) Since a micropump is installed on the top of the L-shaped hollow tube, the micropump is used to pump air into the L-shaped hollow tube to maintain the air pressure balance of the L-shaped hollow tube. Because the air pressure value in the L-shaped hollow tube cannot be detected and kept constant, the liquid metal flow related to the air pressure value is controlled by the micropump, so the length of the liquid metal in the L-shaped hollow tube cannot truly reflect the force deformation of the elastic shell, resulting in landslides Monitoring errors of displacement and deformation;

[0007]3), the L-shaped hollow tube is arranged on the top side of the elastic shell, the slender L-shaped hollow tube has low strength, and the The strength is very weak, easy to break and damage in actual use

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