scholarly journals Monitoring a Heatsink Temperature Field Using Raman-Based Distributed Temperature Sensor in a Vacuum and −173 °C Environment

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4186
Author(s):  
Jingchuan Zhang ◽  
Peng Wei ◽  
Qingbo Liu
Keyword(s):  
Temperature Field ◽  
Temperature Measurement ◽  
Temperature Sensor ◽  
Outer Space ◽  
Time Domain Reflectometry ◽  
Space Environment ◽  
Distributed Temperature Sensing ◽  
Distributed Temperature Sensor ◽  
The Difference ◽  
Temperature Equation

A heatsink is a large experimental device which is used to simulate the outer space environment. In this paper, a Raman-based distributed temperature sensor was used for real-time and continuous heatsink temperature monitoring, and a special Raman-based distributed temperature sensing method and system have been proposed. This method takes advantage of three calibration parameters ( Δ α , γ , C ) to calculate the temperature. These three parameters are related to the attenuation of the optical fiber, the Raman translation, and the difference of optoelectronic conversion, respectively. Optical time domain reflectometry was used to calculate the location. A series of heatsink temperature measurement experiments were performed in a vacuum and −173 °C environment. When the temperature dropped to −100 °C, the parameter Δ α was found to vary. A method was proposed to recalculate Δ α and modify the traditional Raman fiber temperature equation. The results of the experiments confirmed the validity of this modified Raman fiber temperature equation. Based on this modified equation, the temperature field in the heatsink was calculated. The Raman-based distributed temperature sensor has potential applications in temperature measurement and judging the occurrence of faults in space exploration.

scholarly journals Two-Dimensional Spatial Resolution in Plane Temperature Monitoring Based on Raman Distributed Temperature Sensor

2020 ◽  
Author(s):  
Junfan Chen ◽  
Ning Sun ◽  
Zhongxie Jin
Keyword(s):  
Temperature Field ◽  
Field Distribution ◽  
Spatial Resolution ◽  
Temperature Sensor ◽  
Temperature Sensing ◽  
Two Dimensional ◽  
Distributed Temperature Sensing ◽  
Temperature Field Distribution ◽  
Sensing System ◽  
Distributed Temperature Sensor

Spatial resolution is an important parameter that characterizes the detection capability of a system, and there are extremely high requirements for spatial resolution in important fields such as the fossil energy industry and nuclear industry. In order to realize the high-precision distributed monitoring of the optical fiber distributed temperature sensing system (DTS), the factors affecting the spatial resolution of the DTS system were analyzed, and a two-dimensional planar temperature field distribution monitoring scheme based on Raman distributed temperature sensor (RDTS) was proposed. In this scheme, based on the layout of the two-dimensional RDTS heat source positioning system, multimode fiber was adopted. After comparing several sensing fiber routing schemes, the 45∘ skew 2D wiring method of sensing fiber was finally selected. According to the experimental results, the spatial resolution of the temperature field distribution in the monitoring area can break through the limitation of the system resolution. It has more application value than the traditional one-dimensional distributed temperature sensing system.

Research on Heat Transfer during LFEC Processing by In Situ Temperature Measurement

2011 ◽  
Vol 686 ◽  
pp. 300-304
Author(s):  
Qi Chi Le ◽  
Zhi Qiang Zhang ◽  
Li Li Ru ◽  
Jian Zhong Cui
Keyword(s):  
Heat Transfer ◽  
Electromagnetic Field ◽  
Temperature Field ◽  
Temperature Measurement ◽  
Low Frequency ◽  
Microstructure Observation ◽  
Transfer Behavior ◽  
Regional Temperature ◽  
The Difference

Low-frequency electromagnetic casting (LFEC) processing could improve not only the metallurgical quality of magnesium billet including refining grain size, reducing regional microstructural difference and lightening segregation, but also its surface quality due to the effect of applied electromagnetic field according to the results by microstructure observation and the numerical simulation. In this research in-situ temperature measurement was carried out in LFEC processing in order to investigate heat transfer behavior of billet during solidification. The effects of the electromagnetic conditions (frequency and the intensity) together with the casting temperature on the sump and the mushy zone were investigated in detail. The results indicate that all the casting conditions affect the temperature field of magnesium billet markedly during solidification. Electromagnetic field could decrease not only the sump depth but also the difference of regional temperature field along the solidification direction leading to much more uniform cooling rate.

scholarly journals Raman Distributed Temperature Sensor with Optical Dynamic Difference Compensation and Visual Localization Technology for Tunnel Fire Detection

Sensors ◽  
2019 ◽  
Vol 19 (10) ◽  
pp. 2320 ◽  
Author(s):  
Baoqiang Yan ◽  
Jian Li ◽  
Mingjiang Zhang ◽  
Jianzhong Zhang ◽  
Lijun Qiao ◽  
...  
Keyword(s):  
Temperature Measurement ◽  
Temperature Sensor ◽  
Measurement Accuracy ◽  
Engineering Application ◽  
Optical Power ◽  
Fire Detection ◽  
Visual Localization ◽  
Power Fluctuation ◽  
Tunnel Fire ◽  
Distributed Temperature Sensor

The field of tunnel fire detection requires a Raman distributed temperature sensor (RDTS) with high-accuracy and visual localization. A novel temperature demodulation method to improve the temperature measurement accuracy of the RDTS systems is presented. This method is based on the optical dynamic difference compensation algorithm, which can eliminate the optical power fluctuation. In addition, the visual localization technology is presented by using the longitudinal lining model (LLM) of a three-dimensional (3D) temperature display, which enhances the engineering application of RDTS in tunnel fire detection. Experimental results indicate that the temperature measurement accuracy is optimized from 7.0 °C to 1.9 °C at the sensing distance of 18.27 km by using the presented method. We provide a solution for temperature field monitoring as well as fire visual localization of the tunnel through RDTS systems.

A temperature sensor based on flexible substrate with ultra-high sensitivity for low temperature measurement

2020 ◽  
Vol 315 ◽  
pp. 112341
Author(s):  
Zhaojun Liu ◽  
Bian Tian ◽  
Xu Fan ◽  
Jiangjiang Liu ◽  
Zhongkai Zhang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Temperature Measurement ◽  
Temperature Sensor ◽  
Flexible Substrate ◽  
High Sensitivity

The Study and Application of the Nitrile Gloves’ Production Line’s Online Measurement

2015 ◽  
Vol 727-728 ◽  
pp. 804-808
Author(s):  
Jian Jun Cai ◽  
Jian Bing Han ◽  
Su Qin Qu
Keyword(s):  
Temperature Measurement ◽  
Real Time ◽  
Temperature Sensor ◽  
Production Line ◽  
Moving Objects ◽  
Mold Temperature ◽  
Configuration Software ◽  
Online Measurement ◽  
Line Process ◽  
Tracking Technology

In order to solve the problem of the hand module’s online temperature measurement in Nitrile glove production line process, we have developed a set of moving objects or device used for online temperature measurement. The device is mounted infrared temperature sensor, by using PLC-controlled synchronous tracking technology it can track the hand module in the production line, so it can ensure the infrared temperature sensor and hand module synchronously measure its temperature correctly. By using configuration software kingview, we have developed mold temperature monitoring online measurement interface, real-time monitoring of the mold temperature opponents. After analysis of experimental results we concluded that the device work stable, acquisition of temperature reliably, so it has a promotional value.

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