Three-dimensional stress sensor based on circularly polarized liquid metal antenna

Abstract

The invention discloses a three-dimensional stress sensor based on a circularly polarized liquid metal antenna. The sensor comprises a box body, a shell and a circularly polarized antenna structure body; six surfaces of the box body are symmetrically provided with orifices, the inner side of the surface where each orifice is located is fixedly provided with the shell, the circularly polarized antenna structure body is installed in an inner cavity of the shell, the upper top surface of the circularly polarized antenna structure body clings to an upper cover, the upper cover slidably covers theupper opening of the shell, and the upper cover extends out of the box body; the circularly polarized antenna structure body is a compressible organic polymer body, an annular micro-channel is formedin the organic polymer body, the annular micro-channel is filled with liquid metal serving as an antenna, two ports of the liquid metal antenna are correspondingly connected with two feeder lines, andthe feeder lines are led out from the side wall of the organic polymer body. The invention can remotely monitor the three-dimensional stress change in the rock-soil body in real time, and has the advantages of accurate signal receiving, high stability, small size and the like.

Description

technical field [0001] The invention belongs to the technical field of civil engineering pressure testing, and in particular relates to a sensor capable of remotely monitoring three-dimensional stress changes inside rock and soil bodies. Background technique [0002] In the 21st century, when the global population is growing and the living space of human beings in cities is becoming more and more cramped, underground caverns not only have basic functions such as reliable storage space, but also provide people with a lot of living and entertainment space. In addition, it also has outstanding advantages such as safety and concealment, environmental protection and soil saving, low-carbon energy saving, etc. Therefore, with the progress of the times and the development of society, more and more people pay attention to underground cavern projects and are widely used in municipal facilities , water conservancy and hydropower, resource storage, mineral development and national defe...

AI Technical Summary

Problems solved by technology

[0005] 1. The above-mentioned liquid metal antenna unidirectional stress sensor can only monitor the stress in one direction, but cannot monitor the three-dimensional stress, and the three-dimensional stress is the real stress distribution state inside the rock and soil;

[0006] 2. The multipath effect of the antenna (after the signal propagates through different paths, the time of each component field arriving at the receiving end is different, and they are superimposed on each other according to their respective phases to cause interference, distorting the original signal, or generating errors

The disadvantage of this patent is: because the three-way stress sensor generates electric charges after the pressure is mechanically deformed through the piezoelectric element, the charge voltage is applied to both ends of the liquid metal antenna device through the output lead, causing the length of the liquid metal to change accordingly and transforming into a liquid state The frequency f change signal of the metal antenna is transmitted to the receiving end through wireless; the pressure cannot be directly converted into the change of the length of the liquid metal, which makes the pressure conversion process complicated, and the reliability and accuracy of detection are poor

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