This paper presents a highly sensitive, temperature-insensitive optical carrier microwave interferometry (OCMI) system using a cascaded three fiber Bragg grating (FBG) structure to generate an enhanced Vernier effect for sensing applications. The enhanced Vernier effect is created by superimposing the interferograms of two separate interferometers formed by pairing the sensing FBG with each reference FBG. Experimental and theoretical results show that in strain sensing, the sensitivity based on enhanced Vernier effect is -4.642 MHz/µε, which is 66.3 and 61.4 times higher than that of strain sensor based on two single interferometers used to generate the enhanced Vernier effect in this system respectively. Compared with the strain sensor based on traditional Vernier effect, this sensor has higher sensitivity, and in addition the amplification factor for measuring sensitivity can be easily adjusted by changing the spatial distance between the three cascade FBGs. Moreover, the temperature sensitivity is decreased from -38.318 MHz/°C to -71.384 kHz/°C with temperature compensation. The sensor exhibits high resolution, high sensitivity, and low cross-sensitivity, making it great potential for measuring small physical changes in complex environments.
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This paper presents a highly sensitive, temperature-insensitive optical carrier microwave interferometry (OCMI) system using a cascaded three fiber Bragg grating (FBG) structure to generate an enhanced Vernier effect for sensing applications. The enhanced Vernier effect is created by superimposing the interferograms of two separate interferometers formed by pairing the sensing FBG with each reference FBG. Experimental and theoretical results show that in strain sensing, the sensitivity based on enhanced Vernier effect is -4.
View Article and Find Full Text PDFAn ultrasensitive refractive index (RI) sensing technology based on an enhanced Vernier effect is proposed, which integrates a polymer Fabry-Perot interferometer (FPI) with an open cavity FPI on the tip of a seven-core optical fiber. Interference spectra of the polymer FPI and the open cavity FPI shift to opposite directions as the ambient RI changes, thus leading to the enhanced Vernier effect. Investigations of RI sensitivity and temperature dependence of the proposed fiber sensors are carried out.
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Sensors (Basel)
December 2024
Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communication, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China.
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- The study introduces a high-sensitivity temperature sensing system that leverages an enhanced Vernier effect using cascaded fiber loop interferometers.
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- Experimental results show that this enhanced system achieves a temperature sensitivity of 618.14 kHz/°C, which is significantly higher than both traditional methods and existing microwave interferometry systems, making it ideal for applications in fields like biometrics and smart technology.
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