| As a new kind of functional material,magnetic fluid has both the fluidity of the liquid material and the magnetic property of the solid material.The application of the novel magnetic fluid material to the micro-differential pressure sensor technology is a brand-new idea.In the exploratory stage,but the key is to enhance the performance of the sensor,but also can be applied to the harsh environment such as weightlessness.Because the viscosity is one of the key physical properties of the new applications of magnetic fluid,the magneto-rheological properties of the magnetic fluid are studied by using the magnetorheological rheometer,and the viscosity-temperature behavior and magneto viscous effect are analyzed in this paper.In this paper,a novel Hall-type air chamber magnetic fluid micro-differential pressure sensor is developed for the detection of related equipment in the field of space.The sensor has the advantages of higher sensitivity,better linearity,and smaller size.Based on the theory of the ideal gas equation,a novel Hall-type air chamber micro-differential pressure sensor with magnetic fluid was developed.The theoretical analysis,calculation and deduction,CAXA and PRO/E design model,the ANSYS simulation analysis,the processing and production of the whole process of design,the sensor samples in kind.Then,the design experiment platform is set up,the static characteristic experiment ofthe Hall-type air chamber micro-differential pressure sensor with magnetic fluid is carried out,the main performance indexes are calibrated,and the main influencing factors of the static characteristic are analyzed.In this paper,the main results are as follows:?1?The viscosity of the magnetic fluid increases with the increase of the magnetic field strength,decreases with the increase of the rotational speed,and decreases with the increase of the temperature at room temperature,but the change is not significant.?2?The magnetic field of Hall element is analyzed by ANSYS software simulation.The optimum displacement range ±Ax of the sensor linearity is ± 4mm and the optimum spacing of the two permanent magnets is L= 15mm?that is,the length of the cage?and the maximum flux density is Bmax =0.078T,are determined.?3?The structure of the Hall-type air chamber magnetic fluid micro-differential pressure sensor is designed.?4?The input and output characteristics of the sensor are studied experimentally.The smaller the length of the cage is,the higher the sensor sensitivity is,the optimal.The larger the volume of the air chamber,the smaller the range of the sensor,the best.?5?The optimal performance of the magnetic fluid micro-differential pressure sensor in the Hall-type air chamber is studied experimentally:The sensitivity Sen=2.07×10-3V/Pa,the linearity eL = 3.74%,the hysteresis error eH =1.16%,the repeatability error eR =1.71%and zero drift of 1.06%were calibrated. |
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