A unidirectional stress sensor based on a liquid metal antenna and a method for preparing the same

Abstract

The invention discloses a unidirectional stress sensor based on a liquid metal antenna. The sensor comprises a box (2), the box (2) internally includes two organic polymer cylinders (5) that can be compressed, the length of each organic polymer cylinder (5) equals the distance between two opposite surfaces of the box, the internal of the box is full of a filling material (7), each organic polymer cylinder (5) is provided with a micro channel (4), each micro channel (4) is filled with liquid metal, the liquid metal in the micro channels are electrically connected with coaxial feed lines (1), and the coaxial feed lines (1) are led out of a box packaging object (3). The invention also discloses a preparation method of the unidirectional stress sensor based on the liquid metal antenna. The sensor and the preparation method have the advantages that change of the liquid metal antenna can reflect bearing and deformation of the box effectively, the slope monitoring accuracy and reliability are improved, and the intensity of the liquid metal antenna is improved.

Description

technical field [0001] The invention belongs to the technical field of disaster prevention and control, and in particular relates to a liquid metal antenna-based unidirectional stress sensor and a preparation method of the sensor. Background technique [0002] Modern urban construction, economic development and technological progress have put forward higher level requirements for more and more geotechnical engineering, which requires the improvement of earth pressure testing devices in geotechnical engineering. Measuring soil pressure has always been an important topic in geotechnical engineering. The commonly used testing devices are vibrating wire sensors and resistance strain sensors. However, these testing devices cannot realize remote wireless monitoring, and the measurement accuracy is not high. The monitoring of earth pressure is of great significance to foundation pits, dams, roadbeds, tunnels, etc. [0003] In practical applications, there is no stress testing devi...

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Problems solved by technology

[0004] 1. Since the micropump is installed on the top of the L-shaped hollow tube, the micropump is used to pump air to 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, resulting in The liquid metal flow related to the air pressure value is controlled by the micro pump, 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 an error in the monitoring of the landslide displacement deformation;

[0005] 2. 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 strength at the connection with the elastic shell is very weak, and it is easy to break and damage in actual use.

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