scholarly journals Trichromatic thermoreflectometry for an improved accuracy of true temperature field measurement on a multi-material part

2019 ◽  
Vol 145 ◽  
pp. 105980
Author(s):  
T. Sentenac ◽  
R. Gilblas ◽  
F. Bugarin
Keyword(s):  
Temperature Field ◽  
Field Measurement ◽  
True Temperature ◽  
Material Part ◽  
Improved Accuracy

scholarly journals Bi-color near infrared thermoreflectometry: A method for true temperature field measurement

2012 ◽  
Vol 83 (12) ◽  
pp. 124902 ◽  
Author(s):  
Thierry Sentenac ◽  
Rémi Gilblas ◽  
Daniel Hernandez ◽  
Yannick Le Maoult
Keyword(s):  
Temperature Field ◽  
Field Measurement ◽  
Near Infrared ◽  
True Temperature

scholarly journals Application of Analytical Solution to Steady-State Temperature Field by Double-Row-Pipe Freezing and Verification with Field Measurement: A Case Study of Connected Aisle

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Zequn Hong ◽  
Xiangdong Hu
Keyword(s):  
Temperature Field ◽  
Steady State ◽  
Analytical Solution ◽  
Wall Thickness ◽  
Field Measurement ◽  
Field Analysis ◽  
Shield Tunnel ◽  
Double Row ◽  
Steady State Temperature ◽  
Frozen Wall

In order to solve the problem of sealing water and bearing capacity of a connected aisle in an underwater shield tunnel, a double-circle horizontal freezing method was adopted for ground reinforcement in the connected aisle of Maliuzhou Tunnel, which is China’s first shield tunnel with superlarge diameter built in a composite stratum. This paper proposed a new double-row-pipe freezing model for the calculation of frozen wall thickness based on analytical solution to steady-state temperature field. Besides, field measurement and transient numerical studies of the active freezing period were also carried out to study the freeze-sealing effect. The results show that frozen wall thickness obtained by analytical solutions agrees well with numerical simulation results, which verifies the applicability of the newly proposed calculation method. Field analysis indicates that soil temperature gradually approaches a stable value which is far below the freezing point, and a reliable water-sealing curtain can be formed around the designed connected aisle. Maximum impact of soil excavation on the frozen wall is about 10°C, and reducing exposure time of excavation surface can effectively alleviate the weakening of frozen wall. To obtain comprehensive analysis for freezing wall thickness, a more reasonable arrangement of temperature-measuring holes is expected in future freezing engineering.

scholarly journals Development of a Pyrometer That Measures the True Temperature Field of the Two-Dimensional Array

2020 ◽  
Vol 10 (8) ◽  
pp. 2888
Author(s):  
Bojun Sun ◽  
Xiaogang Sun ◽  
Meisheng Luan ◽  
Jingmin Dai ◽  
Shuanglong Cui
Keyword(s):  
Temperature Field ◽  
Data Processing ◽  
Operation Time ◽  
Radiation Energy ◽  
Operational Efficiency ◽  
True Temperature ◽  
Signal Acquisition ◽  
Two Dimensional ◽  
Dimensional Array ◽  
Optical Part

This paper develops a two-dimensional array pyrometer, which can measure the true temperature field of the two-dimensional array. The pyrometer consists of an optical part, a circuit part and a software part. In the optical part, the radiation energy of the two-dimensional array target is obtained by scanning with the rotating mirror. Then, the radiation signal is converted and amplified by the circuit part. The software component realizes the functions of the pyrometer calibration, signal acquisition and data processing. The data processing adopts the secondary measurement method to calculate the true temperature and uses the multi-threaded method to improve the operational efficiency. Experiments show that the uncertainty of the two-dimensional pyrometer array can reach 1.43%. Compared with the single-threaded method, the true temperature operation time of the two-dimensional pyrometer array is improved by 77%, which verifies that the software operational efficiency is greatly improved.

Investigation on the Welding Temperature Field Measurement in Gas Tungsten Arc Welding

2011 ◽  
Vol 704-705 ◽  
pp. 786-789
Author(s):  
Guang Tao Zhou ◽  
Zi Yu Zhao ◽  
Guo Li Liang ◽  
Wei Hua Chen
Keyword(s):  
Thermal Conductivity ◽  
Temperature Field ◽  
Magnesium Alloy ◽  
Field Measurement ◽  
Arc Welding ◽  
Steel Plate ◽  
Welding Temperature ◽  
Alloy Plate ◽  
Az31b Magnesium Alloy ◽  
Gas Tungsten Arc

Based on the gas tungsten arc welding process this paper investigated the welding temperature field measurement and simulation of 945 steel plate and AZ31B magnesium alloy, using a non-contact and fast response measured temperature method-Infrared Radiation (IR)-which utilized the baffle to remove the arc and hot tungsten electrode interference, the top-face temperature of AZ31B magnesium alloy plate and 945 steel plate. The results indicated that the lengthwise isothermal map of 945 steel plate is much longer than that of AZ31B magnesium alloy plate, which leads to the most temperature field information loss, this is because the thermal conductivity of steel is small and decreases with temperature increase, the thermal conductivity of AZ31B magnesium alloy is much bigger that that of the 945 steel, about 1.5 times of 945 steel, and increased with temperature increase. The results also showed using IR to measure the welding temperature of magnesium alloy is more difficult than 945 steel. Keywords: magnesium alloy, high strength steel, welding temperature field, IR

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