Ultrahigh-pressure sensor of stress attenuation structure

Abstract

The invention provides an ultrahigh-pressure sensor of a stress attenuation structure. The ultrahigh-pressure sensor comprises a metal pressure-bearing element. The upper part of the metal pressure-bearing element is in the form of a conical body, wherein the cross section of the conical body gradually becomes larger. An external pressure acts directly on a minimum pressure-receiving surface at the top of the conical body. The lower part of the metal pressure-bearing element is in the form of a cylinder, wherein the cross section of the cylinder is uniform. Two side flat surfaces are symmetrically machined on the side surfaces of the cylinder. One side flat surface is provided with a force-sensitive chip, and the force-sensitive chip is in connection with two adapter plates through a Wheatstone bridge arranged on the force-sensitive chip. The two adapter plates are vertically and symmetrically arranged up and down relative to the force-sensitive chip. The electrical signals of the adapter plates are led out through leads. The measurement range of the pressure is enlarged by the metal pressure-bearing element within a limited elastic range and a limited pressure-receiving area. Therefore, the upper measuring limit of the pressure is increased, and the ultrahigh-pressure sensor can measure a pressure up to 2 GPa.

Description

technical field [0001] The invention belongs to the technical field of pressure sensors, in particular to an ultra-high pressure sensor with a stress attenuation structure. Background technique [0002] In recent years, with the rapid development of new high-pressure loading technology, ultra-high pressure measurement plays an important role in both military and civilian applications. In the military industry, technologies such as rail guns, electromagnetic guns, and strong radiation loading (laser beams, X-ray beams, ion beams, etc.) have emerged. Necessary technical guarantee. In terms of civil use, this sensor can also be used to study the explosive synthesis, explosive welding, and explosive processing of materials. As the demand for high-pressure testing is increasing and the requirements are getting higher and higher, the testing technology for ultra-high pressure is also constantly developing. The force-sensitive sensor is a sensor that measures pressure based on t...

AI Technical Summary

Problems solved by technology

However, the elastic range of any metal material is limited. If the pressure on the elastic element exceeds the elastic range, the metal element will undergo plastic deformation. In the case of plastic deformation, it is difficult to find the relationship between stress and strain. Increased measurement difficulty also reduces measurement accuracy

For some specific pressure tests, due to the small loading area required for pressure, it is not suitable to reduce the internal stress of the element by directly increasing the cross-sectional area of ​​the metal pressure-bearing element, so it is impossible to use large-section elastic elements to increase the pressure Measuring range

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