Hybrid-Cavity Fabry-Perot Interferometer for Simultaneous Relative Humidity and Temperature Measurement

Ultra-High-Sensitivity Humidity Fiber Sensor Based on Harmonic Vernier Effect in Cascaded FPI

“…The humidity in daily life refers to relative humidity (RH), which means the percentage of the amount of water vapor contained in the air and the amount of saturated water vapor that can exist in the air under the same conditions [1]. Humidity detection plays an important role in agricultural production, meteorology, chemical processing, food storage, medical identification, and structural health monitoring [2,3]. In recent years, many optical fiber sensors have been studied and reported due to their anti-electromagnetic interference, fast response, and high sensitivity [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

High‐temperature Fabry–Perot interferometer based on mode analysis

“…Most often their operation principle is based on the analysis of changes in the spectrum caused by temperature change. For measuring temperature, the use of fibre Bragg grating [1], long period grating [2], Michelson interferometer [3,4], Mach-Zehnder interferometer [5][6][7], Fabry-Perot interferometer (FPI)- [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] based temperature sensing has been studied extensively. Among them, the FPI has attracted the attention of the researchers, because of their low cost, small size and easy to manufacture.…”

“…Liu et al [13] demonstrated a fibre-optic thermometer based on dual cascaded FPIs made from the same material of silicon, one thick and one thin, as a result, they achieved a large dynamic range and a high resolution, and the resolution was 0.0068°C −1 at the range from −50 to 130°C. Wang et al [14] demonstrated a novel hybrid-cavity FPI based on four-hole PCF for temperature measurement, the temperature sensitivity was 0.1 rad°C −1 at the range from 30 to 55°C. Zhou et al [15] formed an optical fibre FPI composed by a pair of fibre Bragg gratings (FBG), and the temperature sensitivity was 11.5 pm°C −1 from 30 to 50°C.…”