Journal ArticleDOI
Fiber-optic sensing of pressure and temperature
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TLDR
The use of a fiber-optic Mach-Zehnder interferometer to measure differences in temperature or pressure between two single-mode fiber arms is described.Abstract:
The use of a fiber-optic Mach-Zehnder interferometer to measure differences in temperature or pressure between two single-mode fiber arms is described. Temperature or pressure changes are observed as a motion of an optical interference fringe pattern. Values are calculated for the pressure and temperature dependence of the fringe motion. Pressure and temperature measurements are made with the interferometer, and the experimental values for sensitivity are in good agreement with those calculated.read more
Citations
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In-fibre Bragg grating sensors
TL;DR: In-fibre Bragg grating (FBG) sensors are one of the most exciting developments in the field of optical fiber sensors in recent years as discussed by the authors, and significant progress has been made in applications to strain and temperature measurements.
Journal ArticleDOI
Optical fiber sensor technology
Thomas G. Giallorenzi,Joseph A. Bucaro,Anthony Dandridge,G. H. Sigel,J. H. Cole,Scott C. Rashleigh,R. Priest +6 more
TL;DR: The current state of the art of optical fiber sensors is reviewed, the principles of operation are detailed and the various types of fiber sensors are outlined.
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A 920-Kilometer Optical Fiber Link for Frequency Metrology at the 19th Decimal Place
Katharina Predehl,Gesine Grosche,S. M. F. Raupach,Stefan Droste,Osama Terra,Janis Alnis,Thomas Legero,Theodor W. Hänsch,Thomas Udem,Ronald Holzwarth,Harald Schnatz +10 more
TL;DR: In this paper, phase-stabilized distribution of an optical frequency over 920 kilometers of telecommunication fiber is presented, where the authors used two antiparallel fiber links to determine their fractional frequency instability.
Journal ArticleDOI
Polarization in optical fibers
TL;DR: In this paper, the nature of random coupling between normal modes of polarization is analyzed and discussed in connection with various applications, such as fibers with very small or very large birefringence for polarization dependent applications.
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Smart Structures and Materials
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References
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Journal ArticleDOI
Fiber optics strain gauge.
C D Butter,G. B. Hocker +1 more
TL;DR: A fiber optics strain gauge measuring strains of <0.4 × 10.2 × 10 m 1 is demonstrated, utilizing the change in optical pathlength caused by strain in a fiber.
Journal ArticleDOI
Modes in diffused optical waveguides of arbitrary index profile
G. Hocker,William K. Burns +1 more
TL;DR: In this paper, a method for numerical calculation of the phase constants of the modes of diffused optical waveguides of arbitrary index profile is presented. But this method is not suitable for the case of Gaussian and exponential shapes.
Journal ArticleDOI
Optical fiber acoustic sensor
TL;DR: Experimental data is presented on intensity modulation effects detected in several different multimode step index fibers found in long length, low-loss optical fiber coils as direct acoustic sensors.