Abstract
A novel optical fiber sensor with the ability to simultaneously measure gas pressure and temperature is proposed and experimentally demonstrated. The sensor comprises a fiber Bragg grating (FBG) and Fabry–Pérot interferometer (FPI) cascading; the FPI consists of two sections of single mode fiber splicing a short quartz capillary with a gas channel prepared by femtosecond laser micromachining that circulates the Fabry–Pérot cavity with external gas. Because the open cavity FPI is only sensitive to gas pressure and extremely less sensitive to temperature, while FBG is only sensitive to temperature and insensitive to gas pressure, an extremely simple diagonal matrix of sensitivity is obtained. The diagonal matrix elements are temperature and gas pressure sensitivity, corresponding to 0.012 nm/°C and 4.14 nm/MPa, respectively. Experimental results show that the sensor structure can realize the simultaneous measurement of gas pressure and temperature and eliminate the cross sensitivity between the gas pressure and temperature. The proposed sensor has the advantages of compact structure, simple fabrication, and convenient packaging and has a wide application prospect in the field of simultaneous measurement of gas pressure and temperature.
Highlights
The fiber Bragg grating (FBG) sensor has the advantages of resisting electromagnetic interference, compact structure, simple manufacturing, convenient packaging, and an easy to build remote monitoring system
Researchers have reported a series of simultaneous measurements of gas pressure and temperature of optical fiber sensors based on an FBG and Fabry–Pérot interferometer (FPI) cascading
We proposed and demonstrated a gas pressure and temperature simultaneous measurement sensor based on an FBG and FPI cascade structure
Summary
The fiber Bragg grating (FBG) sensor has the advantages of resisting electromagnetic interference, compact structure, simple manufacturing, convenient packaging, and an easy to build remote monitoring system. In order to form more versatile sensors, the incorporation of FBG and Fabry–Pérot interferometer (FPI) is often used to achieve parameter measurements, such as magnetic field, temperature, relative humidity, hydraulic pressure, and hydrogen.12 In these structures, the FBG can be used in sensing elements or as temperature compensation in other parameter measurements. Researchers have reported a series of simultaneous measurements of gas pressure and temperature of optical fiber sensors based on an FBG and FPI cascading.. Wu et al proposed a sensor structure based on an FBG and sidehole fibers cascading for simultaneous gas pressure and temperature measurements.. Low cost, simple fabrication, and high accuracy, the proposed sensor has important application value in the field of gas pressure and temperature simultaneous measurement
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