A three-way stress sensor with a liquid metal antenna

Abstract

The invention discloses a tri-direction stress sensor with a liquid metal antenna. The stress sensor comprises a square hexahedral box (1), three surfaces sharing a vertex serve as stress surfaces (2) of the box, two organic polymer cylinders (3) are clamped between every stress surface (2) and an opposite surface thereof, each organic polymer cylinder (3) includes a spiral micro channel (5), each spiral micro channel (5) is full of liquid metal, and the liquid metal in the spiral micro channels (5) implements feeding via connected coaxial feed lines. Under the condition of tri-direction stress, the spiral micro channels (5)in the organic polymer cylinders (3) deform, so that the frequency of a device changes, an antenna frequency receiver measures the pressure of soil or rock, and thus, the pressure condition of the soil or rock is monitored and measured remotely. The tri-direction stress sensor has the advantages that stresses in three directions can be monitored in real time remotely, and the detection accuracy and reliability are improved.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering pressure testing, and in particular relates to a three-way stress sensor with a liquid metal antenna. Background technique [0002] The three-dimensional stress test of rock-soil mass or concrete body in civil engineering is a basic work in engineering, and it is 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 CN1...

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 stress sensors: 1. The existing three-way stress sensors are mainly based on sensing or vibrating wire soil boxes, and the accuracy of such test devices is not high enough. Susceptible to electromagnetic interference, the measuring range is not large enough, and the long-term stability is poor; 2. The existing three-way stress sensors are wired to transmit test data, and the test depth is not deep enough to allow remote testing; 3. The existing three-way stress sensors are all Long-term, real-time remote monitoring is not possible

[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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