scholarly journals A Review of Measurement Calibration and Interpretation for Seepage Monitoring by Optical Fiber Distributed Temperature Sensors

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5696
Author(s):  
Yaser Ghafoori ◽  
Andrej Vidmar ◽  
Jaromír Říha ◽  
Andrej Kryžanowski
Keyword(s):  
Optical Fiber ◽  
Safety Concern ◽  
Seepage Flow ◽  
Data Interpretation ◽  
Temperature Sensors ◽  
Temperature Data ◽  
Temperature Measurements ◽  
Internal Erosion ◽  
Sensor Technology ◽  
Distributed Temperature Sensors

Seepage flow through embankment dams and their sub-base is a crucial safety concern that can initiate internal erosion of the structure. The thermometric method of seepage monitoring employs the study of heat transfer characteristics in the soils, as the temperature distribution in earth-filled structures can be influenced by the presence of seepage. Thus, continuous temperature measurements can allow detection of seepage flows. With the recent advances in optical fiber temperature sensor technology, accurate and fast temperature measurements, with relatively high spatial resolution, have been made possible using optical fiber distributed temperature sensors (DTSs). As with any sensor system, to obtain a precise temperature, the DTS measurements need to be calibrated. DTS systems automatically calibrate the measurements using an internal thermometer and reference section. Additionally, manual calibration techniques have been developed which are discussed in this paper. The temperature data do not provide any direct information about the seepage, and this requires further processing and analysis. Several methods have been developed to interpret the temperature data for the localization of the seepage and in some cases to estimate the seepage quantity. An efficient DTS application in seepage monitoring strongly depends on the following factors: installation approach, calibration technique, along with temperature data interpretation and post-processing. This paper reviews the different techniques for calibration of DTS measurements as well as the methods of interpretation of the temperature data.

Simulation of Fiber Bragg Grating Characteristics and Behaviors as Strain and Temperature Sensor

2021 ◽  
Vol 9 (11) ◽  
pp. 1154-1161
Author(s):  
Muhammad Arif Bin Jalil
Keyword(s):  
Optical Fiber ◽  
Fiber Bragg Grating ◽  
Temperature Sensor ◽  
Optical Fiber Sensor ◽  
Temperature Sensors ◽  
Bragg Reflector ◽  
Sensor Technology ◽  
Bragg Grating ◽  
And Behaviors ◽  
And Behavior

Abstract: Optical Fiber Sensor (OFS) has come quite considerable and famous in world of sensor technology where it has been used widely to detect for a changeable environment and responds to some output on other system such as in industrial, chemical analysis and monitoring. A Fiber Bragg Grating (Fiber Bragg Grating) is a kind of appropriated where the short fragment of optical fiber which certain and specific wavelength is reflected with light and the Bragg reflector started developed and transmits all others. The current project is concerned with the development characteristics and behaviors of strain and temperature sensors acting on Fiber Bragg Grating by a computer simulation. This study focuses on analyzing the performance of the characteristics and behavior of strain and temperature sensors acting on Fiber Bragg Grating. A strain sensor is used to measure strain on an object of which the resistance varies range with applied force. Meanwhile,for the temperature sensor is used to measure and detect any abnormality of temperature acting on Fiber Bragg Grating such as can lead into fire and accidents. This will found out on how Fiber Bragg Grating can demonstrate strain and temperature sensors. A simulation of the computer program (MATLAB) will be carried out to simulate due to the strain and temperature sensor of Fiber Bragg Grating. Keywords Fiber Bragg Grating, sensors; Strain; Temperature; Simulation; MATLAB

Analytical investigation of the receiver for Raman-based distributed temperature sensors

2021 ◽  
Vol 63 ◽  
pp. 102484
Author(s):  
Luís C.B. Silva ◽  
Carlos E.S. Castellani ◽  
Marcelo E.V. Segatto ◽  
Maria J. Pontes
Keyword(s):  
Analytical Investigation ◽  
Temperature Sensors ◽  
Distributed Temperature Sensors

Highly-sensitive optical fiber temperature sensors based on PDMS/silica hybrid fiber structures

2018 ◽  
Vol 284 ◽  
pp. 22-27 ◽  
Author(s):  
Han Gao ◽  
Haifeng Hu ◽  
Yong Zhao ◽  
Jin Li ◽  
Ming Lei ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Temperature Sensors ◽  
Hybrid Fiber ◽  
Highly Sensitive ◽  
Silica Hybrid

scholarly journals The Effect of Suffusion Phenomenon in the Increasing of Land Subsidence Rate

2016 ◽  
Vol 2 (7) ◽  
pp. 316-323 ◽  
Author(s):  
Elmira Khaksar Najafi ◽  
Hadi Faghihmaleki
Keyword(s):  
Land Subsidence ◽  
Alluvial Soil ◽  
Ground Surface ◽  
Seepage Flow ◽  
Internal Erosion ◽  
Alluvial Soils ◽  
Sedimentary Deposits ◽  
Subsidence Rate ◽  
Internal Instability ◽  
Ground Surface Settlement

Land subsidence is defined as gradually ground surface settlement in an aquifer due to the compaction of unconsolidated sedimentary deposits. Since in an aquifer, deposits consist of cohesive or non-cohesive alluvial soil layers. The consolidation theory cannot be explained as the only reason for land subsidence. According to the susceptibility of alluvial soils to suffusion, internal erosion is also considerable to enhance the rate of the local settlement. Suffusion is explained as a process of soil particle movement in the soil body due to the effect of seepage flow on it. The subsidence rate in southwest and south of Tehran in Iran is very considerable whereby some structures have suffered significant damages due to this phenomenon. In this research, the contribution of suffusion and land subsidence was investigated in damaged building located at Ghale Morghi Street in southwest of Tehran, as a case history. Because of the incapability of available methods, in this article, a probability pattern is also proposed using statistical analysis for determination the likelihood of internal instability in alluvial soils in regard to soil cohesiveness.

scholarly journals Special Section Guest Editorial: Optical Fiber Sensor Technology

2019 ◽  
Vol 58 (07) ◽  
pp. 1
Author(s):  
Gary A. Miller ◽  
Stavros Pissadakis ◽  
Ping Lu
Keyword(s):  
Optical Fiber ◽  
Guest Editorial ◽  
Special Section ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Sensor Technology

The Measure Technology of the Structure Stress during the Weighing Process of the Large Structure

2013 ◽  
Vol 838-841 ◽  
pp. 2010-2013
Author(s):  
Shu Min Li
Keyword(s):  
Finite Element Analysis ◽  
Optical Fiber ◽  
Dynamic Stress ◽  
Test Bench ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Sensor Technology ◽  
Large Structure ◽  
Element Analysis ◽  
Key Points

The structure needs to be lifted-off from the ground during the weighing progress. For that the weighing fulcrum and the building fulcrum are different and the building fulcrum is fewer usually and the weighing system has some asynchronism during the lifting process of the structure, it is very important to measure the stress of the key points of the structure during the weighing progress. The paper uses finite element analysis to get the stress sensitive of the weighing device while weighing and uses the optical fiber sensor technology to measure the dynamic stress. Through the experiment with the weighing test bench show that the optical fiber sensor technology has a clear advantage to the traditional resistance strain gauge technique.

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