Breathable wearable strain sensor and preparation method and application thereof

Abstract

The invention belongs to the technical field related to flexible sensing, and discloses a breathable wearable strain sensor and a preparation method and application thereof; the method comprises the following steps: (1) providing a stretchable breathable fiber membrane as a substrate, and pre-stretching the stretchable breathable fiber membrane; (2) preparing a conductive layer on the stretchable breathable fiber membrane, and forming a strain sensing network on the conductive layer; (3) releasing the tensile strain of the stretchable breathable fiber membrane so as to obtain the breathable wearable strain sensor. According to the preparation method, the sensitivity degree of the local area of the conductive network is controlled by regulating and controlling the microstructure of the corresponding area of the conductive layer, and the regulation and control of the sensitivity degree can be realized, so that the programmable control of the sensing-conductive network can be realized, and the performance is good. Meanwhile, the stretchable breathable fiber membrane is pre-stretched, and the conductive layer is prepared, so that the fiber orientation of the surface layer is changed, and is changed into orientation along the pre-stretching direction to a certain extent from complete zero, and the performance is improved.

Description

technical field [0001] The invention belongs to the technical field related to flexible sensing, and more specifically relates to a breathable wearable strain sensor and its preparation method and application. Background technique [0002] The market for wearable devices is growing rapidly, and wearable sensors are constantly being introduced, such as 1. For physiological health status monitoring: strain sensors can be used to detect the impact of the heartbeat on the chest cavity to monitor heart health status, and strain sensors can be used to monitor the contraction of the chest Diastole is used to monitor whether the respiratory function is normal, and a strain sensor can be attached to the artery at the wrist to monitor the beating state of the pulse. 2. For the recognition of human motion signals in the process of human-computer interaction, the strain sensor can be used to monitor the movement of each finger to realize gesture recognition, and the strain sensor can be...

AI Technical Summary

Problems solved by technology

[0003]Existing wearable devices usually have two forms: 1. All sensing units are independent, that is, a sensing unit has a set of circuits and Acquisition system, in order to obtain a variety of signals, it is necessary to accumulate multiple sensors and their corresponding wires and systems. This form of sensor is very bulky and cannot be worn on a daily basis.

2. Multiple sensing units are integrated into a unified circuit. The sensing units are integrated on a substrate with a wire network through traditional welding. The sensor and the wire substrate are stacked together, and the thickness is doubled. All sensing units and substrates are independent preparation processes, each of which is manufactured first and then integrated, which has poor comfort and reliability and complicated processes

[0004]The use of flexible strain sensors to monitor different dynamic physiological health information of the human body requires the use of strain sensors with different performances according to the corresponding dynamic strain range, such as selecting a small range when measuring pulse High-sensitivity strain sensor, to measure joint bending, choose a large range and low-sensitivity strain sensor. If you want to measure different dynamic physiological signals at the same time, you usually need to integrate different strain sensors to form a strain sensor network. The wire part of the strain sensor network is usually It needs to be processed separately on a flexible substrate, which leads to the following disadvantages: complex processing technology, complex integration process, low reliability and poor wearable comfort

The main reasons for the above defects are: 1. Different strain sensors and substrates containing interconnection leads need to be prepared and processed separately, which leads to complex processing technology; 2. All units are independent, so integration requires a separate process, which leads to The integration process is complicated; 3. Due to the large number of connection positions between the sensor pins and the leads on the substrate, the process is complicated and the reliability is poor; 4. Since the strain sensor is stacked on the substrate, the thickness of the flexible sensor is doubled increases, thus reducing wearable comfort

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