Simulation of Thin Film Thermocouple for High Temperature Measurement Applicable to Missiles

2015 ◽  
Vol 65 (5) ◽  
pp. 385 ◽  
Author(s):  
Manoj Kumar Sonker ◽  
M. L. Dewal
Keyword(s):  
Thin Film ◽  
High Temperature ◽  
Temperature Measurement ◽  
Structural Integrity ◽  
Flow Path ◽  
Flowing Fluid ◽  
Measuring Device ◽  
Indirect Determination ◽  
High Temperature Measurement ◽  
Thin Film Thermocouple

<p>Thermocouples have been extensively used for the measurement of temperature since the advent of seebeck effect. Numerous sensors have been developed for temperature measurement, yet measurement of high temperature flowing fluid has been a challenging task. For the measurement of static temperature the measuring device should travel with the fluid at the same speed without disturbing the flow, which is quite unrealistic. So indirect determination of static temperature of flowing fluid is done by using thermocouple exposed into the flowing fluid. Other sensors available for high temperature measurement may lead to problems like resistance in the flow path of fluid which changes the structural dynamics. Thin film thermocouple (TFTC) based on W-W26Re for super high temperature measurement has been investigated which can be used in missiles for surface temperature measurement of nozzle and rocket interior surface. TFTC does not cause disruption in the flow path with maintaining structural integrity. The W-W26Re thermocouple offers advantage of higher seebeck coefficient at high temperature i.e. above 750 K, and usability in vacuum, inert and hydrogen atmosphere. Zirconia Fiber has been proposed as insulation protection material over thermocouple. Modelling and simulation of the TFTC for the temperature range 300 K - 2900 K has been presented. FEA model using PDE has been presented to implement heat equation, current balance  quation, Gauss theorem and Neumann boundary condition. The expected voltage production on exposed temperature gradient has been studied.</p>

Research on Interfacial Diffusion Reliability Model of Thin Film Thermocouple

2021 ◽  
Vol 881 ◽  
pp. 77-85
Author(s):  
Dong Yang Lei ◽  
Yu Feng Sun ◽  
Yu Qing Xue ◽  
Guang Yan Zhao
Keyword(s):  
Thin Film ◽  
High Temperature ◽  
Diffusion Model ◽  
Great Influence ◽  
Protective Layer ◽  
Reliability Model ◽  
Interfacial Diffusion ◽  
Parallel Diffusion ◽  
High Temperature Measurement ◽  
Thin Film Thermocouple

Thin film thermocouple (TFTC) is widely used in high temperature measurement, which is of short response time, less heat residual and integrated structure. Due to the ultra-thin structure of TFTC, the interfacial diffusion has a great influence on its reliability when exposed to high temperature environment, which leads to its performance degradation. Taking thermocouple on the turbine blade as research object, the parallel diffusion model of multilayer thermocouple is proposed based on Fick’s law. The reliability model of the protective layer, the sensitive layer and the insulating layer are established in the basis of the parallel diffusion model. According to the logical correlation among the multilayer films of TFTC, the TTF model of TFTC is given. Finally, an example of reliability model based on multilayer diffusion is simulated by Monte Carlo method, which demonstrates the feasibility of the method and model.

WRe26–In2O3 probe-type thin film thermocouples applied to high temperature measurement

2020 ◽  
Vol 91 (7) ◽  
pp. 074901
Author(s):  
Bian Tian ◽  
Yan Liu ◽  
Zhongkai Zhang ◽  
Libo Zhao ◽  
Zhaojun Liu ◽  
...  
Keyword(s):  
Thin Film ◽  
High Temperature ◽  
Temperature Measurement ◽  
Probe Type ◽  
High Temperature Measurement ◽  
Thin Film Thermocouples

The Design of Automatic System for the Calibration of Testing Temperature Cutter with Thin Film Thermocouple

2016 ◽  
Vol 836-837 ◽  
pp. 552-561
Author(s):  
Yun Xian Cui ◽  
Yang Qi ◽  
Li Ming Guo ◽  
Qi Xiang Zhang ◽  
Ying Jia
Keyword(s):  
Thin Film ◽  
Data Acquisition ◽  
Temperature Measurement ◽  
Cutting Temperature ◽  
Measurement Tool ◽  
Report Generation ◽  
Measuring Device ◽  
Temperature Measuring ◽  
Thin Film Thermocouple ◽  
Data Acquisition Card

In order to get an accurate online measurement for the transient cutting temperature in precision, in an ultra-precision cutting process,a temperature measuring device should be assessed whether it can obtain precise magnitude readings and variables of which are measured accurately. The just produced thin-film thermocouple used to measure tool cutting temperature must be correctly calibrated[3,4] , however traditional calibrating process problems rely on manual operation completely with lots of problems such as low efficiency, high labor intensity and large error. this paper proposes an automatic calibration system for thin-film thermocouple by using temperature measuring furnace, data acquisition card and computer-based software. The system makes an automatically and intelligently calibration process. By using a high-precision data acquisition card and precision amplifier circuit, eight thermocouples can be calibrated at the same time automatically which effectively shortens the calibration time and improves the accuracy. Use temperature metering furnace to control data acquisition. Secondary error from using standard thermocouple and other methods to collect the temperature metering furnace real-time temperature is eliminated. The system software modules consist of data reading, data processing, data display, database operation, data query and report generation module. The experimental results show that nonlinear fitting error is less than 0.6% within the temperature measurement range, which meets the requirement of the secondary precision of thermocouple error. This paper intends to provide a new calibration method for thermocouple temperature measurement tool development and production[7].

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