Interferometric Fiber Optic Sensors
Byeong Ha Lee,Youngho Kim,Kwan Seob Park,Joo Beom Eom,Myoung Jin Kim,Byung Sup Rho,Hae Young Choi +6 more
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TLDR
Each type of interferometric sensor is reviewed in terms of operating principles, fabrication methods, and application fields and some specific examples of recently reported interferometeric sensor technologies are presented in detail to show their large potential in practical applications.Abstract:
Fiber optic interferometers to sense various physical parameters including temperature, strain, pressure, and refractive index have been widely investigated. They can be categorized into four types: Fabry-Perot, Mach-Zehnder, Michelson, and Sagnac. In this paper, each type of interferometric sensor is reviewed in terms of operating principles, fabrication methods, and application fields. Some specific examples of recently reported interferometeric sensor technologies are presented in detail to show their large potential in practical applications. Some of the simple to fabricate but exceedingly effective Fabry-Perot interferometers, implemented in both extrinsic and intrinsic structures, are discussed. Also, a wide variety of Mach-Zehnder and Michelson interferometric sensors based on photonic crystal fibers are introduced along with their remarkable sensing performances. Finally, the simultaneous multi-parameter sensing capability of a pair of long period fiber grating (LPG) is presented in two types of structures; one is the Mach-Zehnder interferometer formed in a double cladding fiber and the other is the highly sensitive Sagnac interferometer cascaded with an LPG pair.read more
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Journal ArticleDOI
Envelope-based technique for liquid level sensors using an in-line fiber Mach-Zehnder interferometer.
Camilo Rodriguez,Moisés R. N. Ribeiro,Anselmo Frizera-Neto,Carlos E. S. Castellani,Maria José Pontes +4 more
TL;DR: A sensor interrogation technique based on the analysis of the overall spectrum envelope of an in-line Mach-Zehnder interferometer structure with three different fibers improves the sensitivity of the sensor by more than an order of magnitude.
Journal ArticleDOI
Advancements in Microfabricated Gas Sensors and Microanalytical Tools for the Sensitive and Selective Detection of Odors.
TL;DR: The authors of this work intend to show the potential of combining both solutions in the creation of highly compact, low-cost, and easy-to-deploy platforms for odor monitoring.
Journal ArticleDOI
Ultrasensitive sensing in air based on Sagnac interferometer working at group birefringence turning point.
Li-Peng Sun,Zihao Yuan,Tiansheng Huang,Zhen Sun,Wenfu Lin,Yan Huang,Peng Xiao,Mingjin Yang,Jie Li,Bai-Ou Guan +9 more
TL;DR: A gas refractometer based on microfiber Sagnac interferometer is demonstrated, which can achieve an ultrahigh sensitivity when operating at the group birefringence turning point and shows its potential for use in gas- and acoustic-sensing applications.
Journal ArticleDOI
Magnetic Resonance Imaging Compatible Non-Invasive Fibre-Optic Sensors Based on the Bragg Gratings and Interferometers in the Application of Monitoring Heart and Respiration Rate of the Human Body: A Comparative Study.
TL;DR: A comparative study of two fibre-optic sensors in the application of heart rate (HR) and respiratory rate (RR) monitoring of the human body is presented, confirming the functionality of the designed probes and demonstrating higher accuracy of the interferometric probe.
Journal ArticleDOI
Fourier transform white-light interferometry based on nonlinear wavelength sampling
TL;DR: In this paper, a nonlinear wavelength sampling algorithm was proposed to reduce the errors in the phase shift of a fiber optic interferometric sensor with a cavity length of 1512.2 μm.
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