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.

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.

Wireless Temperature Measurement and Alarm Device Based on Single Bus Digital Temperature Sensor

2011 ◽  
Vol 135-136 ◽  
pp. 1129-1133 ◽  
Author(s):  
Li Mei Dong
Keyword(s):  
Ambient Temperature ◽  
Temperature Measurement ◽  
Temperature Sensor ◽  
Measurement Accuracy ◽  
Measurement Range ◽  
Alarm System ◽  
Measurement Circuit ◽  
Temperature Detection ◽  
Alarm Limit ◽  
Digital Temperature Sensor

AT89S52 microcontroller was the center controler for wireless temperature measurement and alarm system, through temperature measurement circuit and remote wireless alarm circuit, realized the temperature detection and off-limit alarm of the ambient temperature. The system was composed of temperature acquisition circuit, display circuit and alarm circuit. Temperature sensor was DS18B20, real-time temperature displayed via LED displayer. Users can customize the alarm lower limit and superior limit. when the ambient temperature exceeds the alarm limit, the microcontroller will start the sound and light alarm, and remote wireless alarm. Temperature measurement range from -40 °C to +85 °C, measurement accuracy is 0.5 °C, wireless alarm distance is up to 100 meters. This system is of high precision, wide temperature measurement, and timely alarm.

The Application of Distributed Temperature Sensor in Super-High Arch Dams

2015 ◽  
Vol 744-746 ◽  
pp. 1165-1168
Author(s):  
Jian Fu Zhou ◽  
Yi Hong Zhou ◽  
Chun Ju Zhao
Keyword(s):  
Temperature Change ◽  
Temperature Sensor ◽  
Engineering Application ◽  
Arch Dams ◽  
Distributed Temperature Sensor ◽  
Concrete Temperature ◽  
High Arch Dams

The paper introduces the distributed temperature sensor (DTS), analyzes the system veracity and the concrete temperature change compared with the conventional thermometer, shows that DTS can fast and accurately monitor the temperature of the dam and provide messages for the construction. It has great value in engineering application.

Research on the Surface Acoustic Wave Temperature Sensor

2014 ◽  
Vol 543-547 ◽  
pp. 1266-1269 ◽  
Author(s):  
Kun Zhang ◽  
Wen Di Wang ◽  
Zhao Mei Qiu
Keyword(s):  
Acoustic Wave ◽  
Temperature Measurement ◽  
Surface Acoustic Wave ◽  
Temperature Sensor ◽  
Measurement Accuracy ◽  
Temperature Characteristic ◽  
Experimental Results ◽  
Testing Unit ◽  
Saw Sensor ◽  
Frequency Temperature

This paper puts forward an idea of designing a surface acoustic wave (SAW) sensor to provide a research basis for subsequent researchers. We have made a SAW temperature sensor based on this idea. The experimental results demonstrated the feasibility of the idea, and shown that the frequency-temperature characteristic of the sensing unit is good and the temperature measurement accuracy of the testing unit is high.

scholarly journals Implementation of arduino pro mini and ESP32 cam for temperature monitoring on automatic thermogun IoT-based

2021 ◽  
Vol 23 (3) ◽  
pp. 1366
Author(s):  
P. W. Rusimamto ◽  
Endryansyah Endryansyah ◽  
L. Anifah ◽  
R. Harimurti ◽  
Y. Anistyasari
Keyword(s):  
Body Temperature ◽  
Temperature Measurement ◽  
Temperature Sensor ◽  
Measurement Accuracy ◽  
Measurement Data ◽  
Temperature Monitoring ◽  
Sensor Data ◽  
Test Results ◽  
Web Interface ◽  
Monitor Screen

The purpose of this research is to monitor the temperature by applying arduino pro mini and ESP32 cam using IoT technology which is connected to a web interface. Arduino is used as the main brain of the system where arduino will read data from the MLX90614-ACF temperature sensor. Sensor data will continue to be sent to the server by arduino via the ESP32 cam module. This tool can also take pictures and send images automatically at the same time when measuring temperature. The captured image will automatically be sent to the PC/laptop monitor screen via the website. The website is used to display and monitor the results of temperature measurement data and display the image results from the ESP32 cam. The process of taking photos and measuring body temperature is done automatically. Users can also view data from sensors and photo data sent by arduino and ESP32 cam via the provided web interface. From the test results, this system has been running well where all sensor data is sent and can be displayed on the website. Images and measurement data results are sent to the monitor screen via the website interface with a measurement accuracy of 99.6%.

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
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