Self-driven strain sensor based on flexible photoelectric nano-film

Abstract

The invention provides a self-driven strain sensor based on a flexible photoelectric nano-film, which are used for measuring the strain of a component to be measured and comprises a sliding groove unit and a sliding sheet unit arranged in the sliding groove unit, the sliding sheet body can move along the sliding groove unit, a connecting end at one end of the bottom plate is used for being fixedlyconnected with the component to be measured, and a bulge at the end part of the sliding sheet body is also used for being fixedly connected with the component to be measured; a photosensitive layer is arranged on the surface, attached to the sliding groove unit, of the sliding sheet body, and a shading layer is arranged on the bottom face of the bottom plate. A conductive layer is arranged on thesurface, attached to the sliding sheet body, of the sliding groove unit. The photosensitive layer is manufactured based on a heterojunction structure, and when the to-be-measured component generatesstrain, the photosensitive layer partially receives illumination, and the component strain can be obtained through back calculation according to an output current signal. Compared with a traditional strain measurement method, the strain sensor provided by the invention has the advantages of simple structure, high measurement precision, high response speed and wide application range.

Description

technical field [0001] The invention relates to the field of bridge engineering, in particular to a self-driven strain sensor based on a flexible photoelectric nano film. Background technique [0002] Strain measurement of a structure is an important link in understanding the stress state of the structure, maintaining and optimizing the structure, and ensuring the safety of the structure. It is of great significance in engineering. In the current engineering industry, strain measuring instruments are widely used in the strain measurement of bridges, railways, dams and various construction facilities. At present, the commonly used strain measuring instruments mainly include dial gauge strain gauges, resistance strain gauges, vibrating wire strain gauges, and so on. A dial gauge strain gauge is a mechanical strain measuring instrument that compares the difference between two measurements as the desired amount of deformation. However, the dial gauge strain gauge must be marke...

AI Technical Summary

Problems solved by technology

However, the dial gauge strain gauge must be marked on the standard needle gauge before each measurement before it can be measured on the structure to be measured, which is cumbersome, and due to the length of the mark and the limitation of installation, it is limited in practical applications. Big

The resistance strain gauge uses the "strain resistance effect" of a certain metal wire conductor to work, but it has nonlinearity, weak output signal, poor anti-interference ability, and is greatly affected by the environment, and it can only measure one point on the surface of the component. Strain in one direction without global measurement

The vibrating wire strain gauge can sense the stress change inside the structure, and transfer its deformation to the vibrating wire through the front and rear end seats to change the stress of the vibrating wire, thereby changing the vibration frequency of the vibrating wire, and its frequency signal is transmitted to the Reading device, and then measure the strain inside the structure, but the vibrating wire strain gauge has the defects of high sensor material and processing technology requirements, and low measurement accuracy.

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