Shear strain type pressure sensor

Abstract

A shear strain type pressure sensor comprises a shell. A magnetic field generating device in the shell comprises two magnetic poles which are opposite in magnetism and correspond to each other oppositely. A shear plate is arranged in the gap between the two magnetic poles, a rubber sheet is fixed on one side of the shear plate and in full contact with the end face of the first magnetic pole in the two magnetic poles, and a first electrode is fixed on the other side of the shear plate and fixedly provided with a magnetorheological elastomer. A second electrode is fixed on the other side of the magnetorheological elastomer, the second electrode is fixedly connected with the end face of the second magnetic pole in the two magnetic poles, the first electrode and the second electrode are electrically connected with a signal conditioning module, one end of the shear plate upwards extends to penetrate through an S-shaped force measuring piece and then extends out of the upper end face of the shell, a supporting plate used for supporting the S-shaped force measuring piece is fixed in the shell, a stop piece is arranged on the shear plate, and the lower end face of the stop piece is in contact with the upper end face of the S-shaped force measuring piece. The shear strain type pressure sensor is high in resolution, high in sensitivity, and large in force testing range.

Description

Technical field [0001] The invention relates to a pressure sensor, in particular to a shear strain pressure sensor. Background technique [0002] Pressure sensor is the most commonly used sensor in industrial practice. It is widely used in various industrial automation environments, involving water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military, petrochemical, oil well, electricity, ships, machine tools , Pipelines and many other industries. Traditional pressure sensors are mainly mechanical structure devices, and use the deformation of elastic elements to indicate pressure. However, this structure is large in size and heavy in mass, and cannot provide electrical output. With the development of new material technology, new sensors have also emerged. Piezoelectric pressure sensors use the piezoelectric effect of piezoelectric materials to convert the measured pressure into electrical signals. The piezoelectr...

AI Technical Summary

Problems solved by technology

However, the piezoelectric pressure sensor still has the following disadvantages: its resolution is low, it is not sensitive to small strains, it cannot respond well to the measurement of small force values, the range of force measurement needs to be improved, and the pressure of the piezoelectric pressure sensor Electrical materials are greatly affected by the environment, which can easily lead to inaccurate measurement of piezoelectric pressure sensors

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