Abstract
The publication describes the design, production, and practical verification of an alternative pressure sensor suitable for measuring the pressure of gas, based on a combination of fiber-optic technology and 3D printing methods. The created sensor uses FBG (Fiber Bragg Grating) suitably implemented on a movable membrane. The sensor is equipped with a reference FBG to compensate for the effect of ambient temperature on the pressure measurement. The sensor is characterized by its immunity to EM interference, electrical passivity at the measuring point, small size, and resistance to moisture and corrosion. The FBG pressure sensor has a pressure sensitivity of 9.086 pm/mbar in the range from 0 to 9 mbar with a correlation coefficient of 0.9982. The pressure measurement in the specified range shows an average measurement error of 0.049 mbar and a reproducibility parameter of 0.0269 ± 0.0135 mbar.
Highlights
Introduction and Damien KinetThe designed sensor, which is described in detail in this publication, is intended for measuring the pressure of liquids or gases
If we introduce light from a broad-spectrum radiation source into an optical fiber with fiber-optic technology (FBG), the narrow spectral region corresponding to Equation (1) is reflected, and the remaining spectral part passes through the structure
The results of the total measurement of 50 cycles performed show that pressure measurement using a membrane FBG sensor reaches a maximum error of 0.194 mbar at a pressure of 5.136 mbar, which represents a relative error of 3.777%
Summary
The designed sensor, which is described in detail in this publication, is intended for measuring the pressure of liquids or gases. Zhang et al [11] presented the pressure FBG sensor embedded in a polymer-filled metal cylinder with an opening on one side to enhance the pressure sensitivity Based on this type of embedding, the authors declare that the sensitivity of the fractional change in the Bragg wavelength of experimental sensor is −3.41 × 10−3 MPa−1 (about 1720 times higher than a bare fiber grating). Based on the experimental results, the authors declare that the sensitivity coefficient of the sensor is 2.3 × 10−3 MPa−1 for a measuring range of 0.5 MPa, and the linearity is 0.9720 Another membrane sensor similar to our solution is designed for measuring water or oil pressure [23]. The study in this article focuses on the principle of the transverse measurement of the deflection of a membrane using 3D printing technology for encapsulation of the optical fiber Bragg grating and the implementation of the conversion of the effect of pressure on the measurement of deformation
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