Journal ArticleDOI
Fiber optic distributed thermal sensor
TLDR
In this article, a distributed thermal sensor formed by inducing a deliberated absorption in an infrared optical fiber is presented, where the increased absorption coefficient αab of this modified fiber determines the linear sensing length of the distributed infrared sensor.Abstract:
A novel concept of a fiber optic distributed sensor is presented. In particular, we describe a distributed thermal sensor formed by inducing a deliberated absorption in an infrared optical fiber. The increased absorption coefficient αab of this modified fiber determines the linear sensing length of the distributed thermal sensor. When part of the modified fiber is heated, infrared radiation is generated in the fiber and transmitted through it to its distal face. Measuring this radiation power with a radiometer, we are able to determine the average spatial temperature distribution along the fiber sensing length.read more
Citations
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Journal ArticleDOI
Infrared Optical Fiber Sensors
TL;DR: In this paper, the progress of infrared optical fiber sensors is reviewed with particular interest in thermometry and spectroscopy, and the advantages and disadvantages of infrared fibers must be considered carefully in the development of fiber sensors.
Proceedings ArticleDOI
Research and development on silver halide fibers at Tel Aviv University
F. Moser,N. Barkay,A. Levite,Eli Margalit,Idan Paiss,Amir Sa'ar,I. Schnitzer,Albert Zur,Abraham Katzir +8 more
TL;DR: In this article, the authors present a survey of current work at Tel Aviv University on properties and applications of silver and halide infrared transmitting fibers, which can be repetitivelybent on a 5 cm radius without degrading the transmission, up to thousands of bends.
Journal ArticleDOI
Elasticity of mixed silver‐halide polycrystalline optical fibers
N. Barkay,A. Katzir +1 more
TL;DR: The elastic strain limit of polycrystalline mixed AgClxBr1−x fibers was studied in this paper, and the experimental method was based on the spring-back upon releasing a stressed material.
Journal ArticleDOI
Radiation thermometry for low temperatures using an infrared hollow waveguide
TL;DR: In this paper, the authors compared various optical fibers for application to remote radiation thermometry and found that the highest optical transmission efficiency was attained with a fluoride glass fiber for the temperature range of > 700°C, with a halide crystalline fiber for 120 to 700°c, and with a dielectric-coated metal hollow waveguide for < 120°C.
Journal ArticleDOI
Theory of fiber optic radiometry, emissivity of fibers, and distributed thermal sensors
Albert Zur,Abraham Katzir +1 more
TL;DR: A general radiometric theory of multimode step index fibers, covering in particular the region of mid- and far IR fibers, and the theory of a new fiber optic distributed thermal sensor is presented, which needs no external source of radiation for its operation.
References
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Journal ArticleDOI
Use of infrared fibers for low‐temperature radiometric measurements
A. Zur,Abraham Katzir +1 more
TL;DR: In this article, a simple radiometer with AgClxBr1−x infrared fibers was used to perform noncontact temperature measurements in the range 25-50˚C. Good correlation was found between the radiometric results and those obtained with a regular thermocouple.
Journal ArticleDOI
Multiple Sensor Optical Thermometry System for Application in Clinical Hyperthermia
TL;DR: Results of thermometry evaluation are presented, including data on automatic calibration, temperature accuracy and stability, and EMI protection.
Proceedings ArticleDOI
Optical And Mechanical Properties Of Silver Halide Fibers
TL;DR: In this article, a series of mixed silver halide crystals of composition AgCl x Br 1-x (0≤x≤1) have been extruded into 0.9 mm diameter fibers of several meters length.
Journal ArticleDOI
Time- and Frequency-Domain Techniques for Measuring the Dielectric Properties of Rocks: A Review
Magdy F. Iskander,Joel B. DuBow +1 more
TL;DR: In this paper, the authors describe an in-situ dielectric probe which utilizes an open-ended section of transmission line as a sample holder and demonstrate the accuracy of the on-line measurements.
Journal ArticleDOI
Absorption and luminescence of silver halide optical fibers
TL;DR: In this paper, the optical absorption edge of the fibers in the visible and the luminescent emission at low temperatures were measured and were found to be similar to those observed in the starting near-single-crystal preforms.