Flexible strain sensor and preparation method

Abstract

The invention provides a flexible strain sensor and a preparation method thereof. The method includes immersing a liquid conductive material in an elastic fabric; respectively providing two ends of the elastic fabric with an electrode, and connecting electrode leads on the electrodes; coating the outer surface of the elastic fabric with an elastomer material and exposing the electrode leads from the elastomer material; obtaining a flexible strain sensor after the elastomer material is solidified. According to the embodiment of the invention, the elastic fabric is selected as a storage channelof the liquid conductive material, and when tension or pressure is applied to the sensor, the liquid conductive material can flow out of the elastic fabric, so that the electrical conductivity of theelastic fabric can be reduced; after the applied external force is removed, the discharged liquid conductive material flows back to the elastic fabric again, thus the conductivity of the elastic fabric is restored, so that the sensor has the functions of tension sensing and pressure sensing at the same time. Not only does the strain sensing range be widened, but also simplifies the preparation process is simplified.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of sensors, in particular to a method for preparing a flexible strain sensor and the flexible strain sensor. Background technique [0002] Strain sensor is an important class of electrical sensing devices. When it is subjected to external force, its own deformation will cause changes in resistance or capacitance. By monitoring these changes, the strain sensing function is realized. In recent years, a new hot spot has emerged in the field of strain sensors—flexible and wearable strain sensors. This kind of flexible wearable strain sensor not only has good flexibility and stretchability, but also can realize the close fit between the sensor and the human body, ensuring the long-term wearing comfort of the user, and also has good sensing performance such as sensitivity, repeatability and stability. , has been applied in the research of physiology, biomechanics and kinesiology. [000...

AI Technical Summary

Problems solved by technology

To prepare this type of strain sensor, a channel for storing liquid sensing material is usually formed inside the elastic substrate, then electrodes are inserted into the channel, and finally the liquid sensing material is injected and sealed. The preparation process is complicated.

Since the channel storing the liquid sensing material is a single cavity, the length and cross-sectional area of ​​the channel storing the liquid sensing material will change significantly only when the sensor is applied with tension, so that this type of strain sensor generally only has tension Sensing function

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