High precision vibrating wire type micro-pressure sensor

Abstract

The invention discloses a high precision vibrating wire type micro-pressure sensor comprising a housing, a cable joint connected with a cable, an induction coil, a micro-pressure sensitive part, an inner plugging cover provided with a central hole, and a permeable part. One end of the housing is connected with the cable joint, and the other end of the housing is connected with the permeable part. The induction coil, the micro-pressure sensitive part, and the inner plugging cover are disposed in the housing, and are sequentially connected together. The micro-pressure sensitive part comprises an upper end, a main body, a corrugated pipe, a lower end, a vacuum diaphragm capsule, and a steel wire. The upper end, the main body, the corrugated pipe, and the lower end are sequentially connected together, and are used to form a sealed cavity body. The steel wire is disposed in the sealed cavity body, and the vacuum diaphragm capsule is connected with the lower end. The micro-pressure sensitive part is disposed in the housing in a packaged manner, and the micro-pressure sensitive part is prevented from damaging caused by external influences. The stability of the sensor is improved, and a problem of inability of realizing extreme micro-pressure and high precision is solved. By combining the flexible stainless steel corrupted pipe with the vacuum diaphragm capsule, precision of measured values is improved.

Description

technical field [0001] The invention relates to a micro-pressure sensor, in particular to a high-precision vibrating wire micro-pressure sensor. Background technique [0002] The vibrating wire pressure sensor is mainly used to monitor the osmotic pressure of geotechnical engineering and other concrete buildings. It can be buried in hydraulic structures or other buildings for a long time to measure the osmotic pressure change inside the structure; it can also be used in rivers, lakes or Water level monitoring in the reservoir area. Due to the special use environment, most of them are installed underwater and measured for a long time. Therefore, the instrument itself needs to have a high waterproof seal. [0003] At present, the existing vibrating wire pressure sensors are mainly composed of water-permeable parts, pressure-sensitive parts, induction coils, protective shells, cable joints and cables. The right end of the sensor, the induction coil is installed in the corresp...

AI Technical Summary

Problems solved by technology

[0010] In order to solve the deficiencies of the prior art, the purpose of the present invention is to provide a structure and packaging process of the existing vibrating wire pressure sensor, which solves the problem of the low measurement stability of the existing vibrating wire pressure sensor and the inability to achieve the limit micro Vibrating wire micro-pressure sensor with high precision and easy damage

Images