STUDY OF THE EFFECT OF TIGHTENING VALUES OF FIBER OPTIC PRESSURE SENSOR MEMBRANE ON ITS GEOMETRY
Abstract
Effect of the tightening force on the geometry of membrane deformation of the amplitude fiber optic pressure sensor of the reflective type is considered. The study was conducted using finite element method, which is one of the main tools for simulating sensors and their elements in the software package SolidWorks. The influence of the magnitude of tightening force of membrane on the optical gate was investigated; which in turn affects the basic characteristics of the sensor such as noise, sensitivity, linearity and so on. It was discovered that increase in the tightening force leads to the appearance of non-linearity of sensor characteristics in the initial measuring range; high tightening increases non-linearity. This means that the tightness must be changed to decrease, however, without compromising sensor impermeability. The area adjacent to the center of membrane is regarded to be the most appropriate for the signal measuring, in terms of getting a linear characteristic. This article ascertains the nature of the nonlinear changes in the optical gate as a function of tightening; it allows to adjust the characteristics of the sensor.
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