Device and method for measuring strain

Abstract

The invention provides a device for measuring strain. The device for measuring the strain comprises a strain gauge, a clamping device, and a transverse strain recorder, wherein the clamping device is used for clamping and extending the strain gauge, the longitudinal strain of the strain gauge is generated in the extension direction, and the transverse strain of the strain gauge is generated in the direction vertical to the extension direction; the transverse strain recorder is used for measuring the transverse strain of the strain gauge; the strain gauge comprises a carbon nano tube membrane structure which comprises a plurality of carbon nano tubes; the carbon nano tubes are arranged along the preferred orientations of a first direction and a second direction, and the carbon nano tubes which are directionally arranged along the preferred orientation of the first direction and the carbon nano tubes which are arranged along the directional preferred orientation of the second direction are overlapped and intersected; an included angle between the first direction and the second direction is formed; the included angle is more than 0 degree and less than 180 degrees; and during using, the strain gauge is arranged on the clamping device along the direction of a bisector of the included angle between the first direction and the second direction. The invention also provides a method for measuring the strain by using the device for measuring the strain.

Description

technical field [0001] The invention relates to a strain measuring device and a measuring method, in particular to a strain measuring device based on carbon nanotubes and a measuring method using the strain device. Background technique [0002] "Strain" is the change caused by external force. Strain gauges use electrical resistance to indicate the amount of strain caused by an external force. There are many different types of strain gauges, the most common being resistive strain gauges. The resistance strain gauge is a sensitive device that converts the strain change on the tested object into an electrical signal. The most widely used strain gauges are metal resistance strain gauges and semiconductor strain gauges. There are two types of metal resistance strain gauges: wire strain gauges and metal foil strain gauges. Usually, the strain gauge is closely bonded to the substrate that generates mechanical strain through a special adhesive. When the stress of the substrate c...

AI Technical Summary

Problems solved by technology

In addition, in order to realize the function of strain amplification, it is necessary to connect a set of follow-up circuit system, which is bulky and complicated, and is not conducive to measuring the deformation of tiny objects.

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