Cascaded-Cavity Fabry-Perot Interferometric Gas Pressure Sensor based on Vernier Effect

An extrinsic Fabry-Perot interferometer (EFPI) composed of double fiber FP cavities in a glass capillary tube to generate Vernier effect has been fabricated and employed for gas pressure sensing. A lead-in single-mode fiber (LSMF) and a reflective single-mode fiber (RSMF) were inserted into the capi...

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Published inSensors (Basel, Switzerland) Vol. 18; no. 11; p. 3677
Main Authors Chen, Peng, Dai, Yutang, Zhang, Dongsheng, Wen, Xiaoyan, Yang, Minghong
Format Journal Article
LanguageEnglish
Published Switzerland MDPI 29.10.2018
MDPI AG
Subjects
extrinsic Fabry-Perot interferometer
femtosecond laser
gas pressure
Vernier effect
Vernier effect
extrinsic Fabry-Perot interferometer
femtosecond laser
gas pressure
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Abstract An extrinsic Fabry-Perot interferometer (EFPI) composed of double fiber FP cavities in a glass capillary tube to generate Vernier effect has been fabricated and employed for gas pressure sensing. A lead-in single-mode fiber (LSMF) and a reflective single-mode fiber (RSMF) were inserted into the capillary tube to form a FP cavity. Femtosecond (fs) laser was used to ablate openings on a capillary tube for gas passage to the FP cavity. A fusion hole was also drilled on the end face of a SMF by fs laser. The sensitivity of the sensor is enhanced due to Vernier effect. Experimental results show that the sensitivity was as high as 86.64 nm/MPa in the range of 0~0.6 MPa, which is 32.8 times larger than that of an open-cavity EFPI sensor without Vernier effect. The temperature cross-sensitivity of the sensor was measured to be about 5.18 KPa/°C. The proposed sensor was characterized by its high sensitivity, compact structure and ease of fabrication, and would have extensive application prospects in gas sensing fields.
AbstractList An extrinsic Fabry-Perot interferometer (EFPI) composed of double fiber FP cavities in a glass capillary tube to generate Vernier effect has been fabricated and employed for gas pressure sensing. A lead-in single-mode fiber (LSMF) and a reflective single-mode fiber (RSMF) were inserted into the capillary tube to form a FP cavity. Femtosecond (fs) laser was used to ablate openings on a capillary tube for gas passage to the FP cavity. A fusion hole was also drilled on the end face of a SMF by fs laser. The sensitivity of the sensor is enhanced due to Vernier effect. Experimental results show that the sensitivity was as high as 86.64 nm/MPa in the range of 0~0.6 MPa, which is 32.8 times larger than that of an open-cavity EFPI sensor without Vernier effect. The temperature cross-sensitivity of the sensor was measured to be about 5.18 KPa/°C. The proposed sensor was characterized by its high sensitivity, compact structure and ease of fabrication, and would have extensive application prospects in gas sensing fields.
Author Zhang, Dongsheng
Yang, Minghong
Dai, Yutang
Wen, Xiaoyan
Chen, Peng
AuthorAffiliation National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, China; chenpeng16@whut.edu.cn (P.C.); zhangdongsheng66@whut.edu.cn (D.Z.); wenxy@whut.edu.cn (X.W.)
AuthorAffiliation_xml – name: National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, China; chenpeng16@whut.edu.cn (P.C.); zhangdongsheng66@whut.edu.cn (D.Z.); wenxy@whut.edu.cn (X.W.)
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Keywords Vernier effect
extrinsic Fabry-Perot interferometer
femtosecond laser
gas pressure
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femtosecond laser
gas pressure
Vernier effect
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Title Cascaded-Cavity Fabry-Perot Interferometric Gas Pressure Sensor based on Vernier Effect
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