Journal ArticleDOI
Temperature sensing by mode-mode interference in birefringent optical fibers.
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TLDR
Fiber-optic sensors are described that utilize the mode-mode interference of the two orthogonal linear polarizations of the HE(11), mode in strongly birefringent single-mode fibers to calculate the sensitivities of various versions of these one-fiber interferometers.Abstract:
Fiber-optic sensors are described that utilize the mode–mode interference of the two orthogonal linear polarizations of the HE11 mode in strongly birefringent single-mode fibers. The sensitivities of various versions of these one-fiber interferometers are calculated. When fibers with high internal stress are used, the temperature sensitivity is reduced by only a factor of 50 compared with that of two-fiber interferometers while the pressure sensitivity is reduced by 7.3 × 103. Thus the cross sensitivity is reduced by a factor of 150.read more
Citations
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Journal ArticleDOI
Monomode optical fibre interferometers for precision measurement
TL;DR: In this article, the design and performance of fiber optic interferometric sensors optimized for specific periodic and quasi-steady state measurands such as rotation, magnetic field, temperature, etc., are described.
Journal ArticleDOI
Fiber Sagnac interferometer temperature sensor
TL;DR: In this article, a modified Sagnac interferometer-based fiber temperature sensor is proposed for temperature measurement, and a comparison of the proposed sensor with Bragg grating and long-period grating fiber sensors is derived.
Journal ArticleDOI
Simultaneous measurement of temperature and strain: cross-sensitivity considerations
TL;DR: In this article, the possibility of simultaneously determining the strain and temperature applied to the same piece of highly birefringent fiber is discussed, and the results of experiments carried out to verify the theoretical predictions are also described.
Journal ArticleDOI
A simple fibre Fabry-Perot sensor
TL;DR: In this article, a simple fibry Fabry-Perot sensor is described in which the uncoated cleaved ends of a length of single mode fibre are employed as the mirror surfaces to produce high visibility cosine squared fringes in the back reflected light.
Journal ArticleDOI
All-fiber absolute temperature sensor using an unbalanced high-birefringence Sagnac loop
TL;DR: A highly sensitive temperature sensor based on a stress-induced high-birefringence-fiber Sagnac loop that uses a Nd-doped-f fiber amplified spontaneous emission source that has an operational bandwidth of more than 50 nm and a temperature accuracy of better than 1 degrees C is demonstrated.
References
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Journal ArticleDOI
Fiber-optic sensing of pressure and temperature
TL;DR: The use of a fiber-optic Mach-Zehnder interferometer to measure differences in temperature or pressure between two single-mode fiber arms is described.
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
Preservation of polarisation in optical-fibre waveguides with elliptical cores
TL;DR: In this paper, an analysis of the propagation characteristics shows that there is a point below the higher-mode cutoff where the difference in group velocities between the two fundamental modes is zero but where there is large enough difference in the phase velocity to preserve polarisation.
Journal ArticleDOI
Linear polarization in birefringent single‐mode fibers
TL;DR: In this paper, singlemode fibers which maintain linear polarization are described and the fibers are birefringent and linear polarization is maintained along either of the two principal axes of the fibers.
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.