Simultaneous Measurement of Temperature and Strain by Combining Active Fibre with Fibre Gratings

2001 ◽  
Vol 34 (6) ◽  
pp. 172-174
Author(s):  
Y. C. Lai ◽  
G. F. Qiu ◽  
W. Zhang ◽  
L. Zhang ◽  
I. Bennion ◽  
...  
Keyword(s):  
High Temperature ◽  
Optical Fiber ◽  
Temperature Dependence ◽  
Simultaneous Measurement ◽  
Smart Structure ◽  
Sensing System ◽  
Measurement Resolution ◽  
Optical Reference ◽  
Active Fibre ◽  
Co Doped

This paper reports on a novel optical fiber-based sensing system for conducting simultaneous measurement of temperature and strain. The sensor design is based on the combination of active fibre and fibre gratings. Addressing smart structure applications erbium/ytterbium co-doped fibre is used to meet the requirements for both high temperature responsivity and small sensor size. The temperature dependence of ASE power under different pump wavelengths is investigated. An optical reference is induced to enhance the measurement resolution. The feasibility of this technique for simultaneous measurement of temperature and strain is demonstrated.

Study on a high-temperature optical fiber F–P acceleration sensing system based on MEMS

2019 ◽  
Vol 120 ◽  
pp. 95-100 ◽  
Author(s):  
Chaoran Zhou ◽  
Xinglin Tong ◽  
Yan Mao ◽  
Qiao Xiong ◽  
Dingjiang Fang ◽  
...  
Keyword(s):  
High Temperature ◽  
Optical Fiber ◽  
Sensing System

scholarly journals High-temperature optical fiber transducer for a smart structure on iron-steel production industry

2001 ◽  
Author(s):  
Jose Miguel Lopez-Higuera ◽  
Francisco J. Madruga Saavedra ◽  
Daniel A. Gonzalez Fernandez ◽  
Victor Alvarez Ortego ◽  
Javier Hierro
Keyword(s):  
High Temperature ◽  
Optical Fiber ◽  
Steel Production ◽  
Smart Structure ◽  
Production Industry

Ultrasonic Nondestructive Evaluation Methods Applicable to High-Temperature Environments Based on Optical Fiber Remote Sensing

2020 ◽  
Author(s):  
Yoji Okabe ◽  
Fengming Yu ◽  
Osamu Saito
Keyword(s):  
High Temperature ◽  
Optical Fiber ◽  
Nondestructive Evaluation ◽  
Guided Waves ◽  
Elevated Temperatures ◽  
Ceramic Plate ◽  
Sensing System ◽  
Heat Resistant ◽  
Propagation Behavior ◽  
Ultrasonic Sensing

Abstract The development of reliable heat-resistant structural materials requires nondestructive evaluation (NDE) techniques to evaluate the damage progress during material testing at elevated temperatures. Hence, our optical fiber ultrasonic sensing system with a phase-shifted fiber Bragg grating (PSFBG) sensor was improved to a remote AE measurement system at high temperature. The optical fiber was used as an ultrasonic waveguide from an object material in a high-temperature furnace to the PSFBG sensor placed far from the furnace. As a result, AE signals at about 1000°C were successfully detected keeping their precise waveform. Therefore this method will be useful to evaluate the damage progress in heat-resistant materials under high temperature. Furthermore, the remote PSFBG ultrasonic sensing system was incorporated into the receiving part of a laser ultrasonic visualizing inspector (LUVI) for a high-temperature NDE. The LUVI can visualize the propagation behavior of ultrasonic guided waves in complex shape structures. As a result, the improved LUVI with the optical fiber ultrasonic receiver succeeded in clear visualization of the ultrasonic wave propagation in a ceramic plate at 1000°C. Then an artificial damage formed in the ceramic plate was able to be detected by the observation of reflection waves from the damage. Hence, this system has a potential as an effective and intuitive NDE method in high-temperature environments.

ABOUT HEAT CAPACITY OF TITANIUM CARBIDE TiCx

2019 ◽  
pp. 56-66
Author(s):  
I. Khidirov ◽  
V. V. Getmanskiy ◽  
A. S. Parpiev ◽  
Sh. A. Makhmudov
Keyword(s):  
Heat Capacity ◽  
High Temperature ◽  
Titanium Carbide ◽  
Temperature Dependence ◽  
Carbon Concentration ◽  
Room Temperature ◽  
Thermodynamic Characteristics ◽  
Liquid Nitrogen Temperature ◽  
Analysis Data ◽  
Thermal Excitation

This work relates to the field of thermophysical parameters of refractory interstitial alloys. The isochoric heat capacity of cubic titanium carbide TiCx has been calculated within the Debye approximation in the carbon concentration  range x = 0.70–0.97 at room temperature (300 K) and at liquid nitrogen temperature (80 K) through the Debye temperature established on the basis of neutron diffraction analysis data. It has been found out that at room temperature with decrease of carbon concentration the heat capacity significantly increases from 29.40 J/mol·K to 34.20 J/mol·K, and at T = 80 K – from 3.08 J/mol·K to 8.20 J/mol·K. The work analyzes the literature data and gives the results of the evaluation of the high-temperature dependence of the heat capacity СV of the cubic titanium carbide TiC0.97 based on the data of neutron structural analysis. It has been proposed to amend in the Neumann–Kopp formula to describe the high-temperature dependence of the titanium carbide heat capacity. After the amendment, the Neumann–Kopp formula describes the results of well-known experiments on the high-temperature dependence of the heat capacity of the titanium carbide TiCx. The proposed formula takes into account the degree of thermal excitation (a quantized number) that increases in steps with increasing temperature.The results allow us to predict the thermodynamic characteristics of titanium carbide in the temperature range of 300–3000 K and can be useful for materials scientists.

scholarly journals Effect of cobalt (nickel) oxide on the properties of zinc–titanium sorbents for high temperature desulphurization of model coal gas

2021 ◽  
Author(s):  
M. Chomiak ◽  
J. Trawczyński ◽  
M. Zawadzki
Keyword(s):  
High Temperature ◽  
Sorption Capacity ◽  
Catalytic Effect ◽  
Mixed Oxides ◽  
Mixed Metal Oxides ◽  
Coal Gas ◽  
Cobalt Nickel ◽  
Texture Structure ◽  
Cobalt Nickel Oxide ◽  
Co Doped

AbstractZn–Ti–Co(Ni) sorbents for H2S removal from model hot coal were prepared and characterized. Effects of cobalt (Co) and nickel (Ni) on the sorbents texture, structure, H2S sorption capacity and regeneration properties were determined. TiO2 formed mixed metal oxides with CoO and NiO in the fresh sorbents, while TiO2 and nanocrystalline sulfides of Zn, Co, Ni were found in sulphided ones. The oxidative regeneration of sulphided sorbents re-formed mixed oxides. Sorption capacity of studied materials increased along with an increase of the amount of added Co (Ni) and also with the number of work cycles. Co-doped Zn–Ti materials adsorbed up to 244% more sulfur than these of Zn–Ti, while Ni-doped materials adsorbed ca. twice more H2S than the corresponding Co-doped sorbents. The addition of Co (Ni) decreased the temperature of ZnS oxidation. The catalytic effect of the Co (Ni) oxides on the oxidation of ZnS was suggested.

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