Distributed temperature measurements using optical fibre technology in an underground mine environment

Aminossadati, Saiied M.; Mohammed, Nayeemuddin M.; Shemshad, J.

doi:10.1016/j.tust.2009.11.006

Cited by 32 publications

(12 citation statements)

References 22 publications

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“…After the new concrete block is set, considering the possible factors, such as cold wave, rain storm, and solar radiation, which may result in cracks, the temperature and thermal stress are also predicted in order to recommend corresponding temperature controlling measures. [9]. The Raman backscattering light has two components: stokes and antistokes components.…”

Section: The Crack Risk Evaluationmentioning

confidence: 99%

“…Antistokes light intensity is particularly sensitive for temperature change and the intensity is modulated by temperature, while the stokes light is not relevant to temperature. The intensity ratio of antistokes to stoke signals from a constant optical pulse can be related to the temperature measurements as given by (1) [9,10]. Combined with internal reference temperature of the equipment and an externally determined calibration function for the particular fiber type, the temperature value can be determined.…”

Section: The Crack Risk Evaluationmentioning

confidence: 99%

“…Combined with internal reference temperature of the equipment and an externally determined calibration function for the particular fiber type, the temperature value can be determined. According to relationship between the speed of light and time, expressed as (2) [9,10], the precise position of measuring points along optical fiber can be located. Thus, the temperature and the position of measuring point can be determined using DTS.…”

Section: The Crack Risk Evaluationmentioning

confidence: 99%

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Crack Risk Evaluation of Early Age Concrete Based on the Distributed Optical Fiber Temperature Sensing

Shi

Chen

2016

Advances in Materials Science and Engineering

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Cracks often appear in concrete arch dams, due to the thermal stress and low tensile strength of early age concrete. There are three commonly used temperature controlling measures: controlling the casting temperature, burying cooling pipe, and protecting the surface. However, because of the difficulty to obtain accurate temperature and thermal stress field of the concrete, the rationality and economy of these measures are not assessed validly before and after construction. In this paper, a crack risk evaluation system for early age concrete is established, including distributed optical fiber temperature sensing (DTS), prediction of temperature and stress fields, and crack risk evaluation. Based on the DTS temperature data, the back-analysis method is applied to retrieve the thermal parameters of concrete. Then, the temperature and thermal stress of early age concrete are predicted using the reversed thermal parameters, as well as the laboratory test parameters. Finally, under the proposed cracking risk evaluation principle, the cracking risk level of each concrete block is given; the preliminary and later temperature controlling measures were recommended, respectively. The application of the proposed system in Xiluodu super high arch dam shows that this system works effectively for preventing cracks of early age concrete.

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Section: The Crack Risk Evaluationmentioning

confidence: 99%

Section: The Crack Risk Evaluationmentioning

confidence: 99%

Section: The Crack Risk Evaluationmentioning

confidence: 99%

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Crack Risk Evaluation of Early Age Concrete Based on the Distributed Optical Fiber Temperature Sensing

Shi

Chen

2016

Advances in Materials Science and Engineering

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“…These systems can be used to adjust drainage and extraction parameters based on measured parameters (Anna 2003;Clarkson et al 2007;Robertson et al 2002). The PR300 Downhole Memory Electronic Pressure Gauge produced by WTS company, in particular, can be used to detect downhole pressure (Chen 2013), while the Sentinel-DTS distributed temperature measurement system produced by Sensornet can be used to detect and display these values in real time at different depths using optical fibers (Aminossadati et al 2010).…”

Section: Introductionmentioning

confidence: 99%

A dynamic evaluation technique for assessing gas output from coal seams during commingling production within a coalbed methane well: a case study from the Qinshui Basin

Yuan

Han

et al. 2020

Int J Coal Sci Technol

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Gas drainage is carried out based on output from each coal bed throughout commingling production of coalbed methane (CBM). A reasonable drainage process should therefore initially guarantee main coal bed production and then enhance gas output from other beds. Permanent damage can result if this is not the case, especially with regard to fracture development in the main gas-producing coal bed and can greatly reduce single well output. Current theoretical models and measuring devices are inapplicable to commingled CBM drainage, however, and so large errors in predictive models cannot always be avoided. The most effective currently available method involves directly measuring gas output from each coal bed as well as determining the dominant gas-producing unit. A dynamic evaluation technique for gas output from each coal bed during commingling CBM production is therefore proposed in this study. This technique comprises a downhole measurement system combined with a theoretical calculation model. Gas output parameters (i.e., gas-phase flow rate, temperature, pressure) are measured in this approach via a downhole measurement system; substituting these parameters into a deduced theoretical calculation model then means that gas output from each seam can be calculated to determine the main gas-producing unit. Trends in gas output from a single well or each seam can therefore be predicted. The laboratory and field test results presented here demonstrate that calculation errors in CBM outputs can be controlled within a margin of 15% and therefore conform with field use requirements.

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“…Various experimental results proved that the DTS system could scan the entire underground mine and locate any spots of temperature variation during heating and cooling processes. The results also showed that the DTS system is a very cost-effective solution when a large number of measurement points are required (Aminossadati et al, 2010).…”

Section: Distributed Temperature Sensing System Applications In Undermentioning

confidence: 86%

Fibre optic conveyor monitoring system

Aminossadati¹,

Yang²

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Transporting coal by means of conveyor belts is common in Australian underground coal mines.Major conveyor belt-related mining incidents are now relatively infrequent as a result of recent improvements in engineering standards and the use of fire-resistant materials. However, conveyor belts are still a potential cause of personal and structural damage. In addition, any unexpected breakdown of rolling components or failure of belts creates a significant interruption to production, which is a major concern for operators, who are responsible for achieving optimum mining production.This project aimed to develop a fibre optic-based distributed temperature sensing (DTS) system to monitor the temperature change of malfunction idlers for heavy-duty conveyor belts in underground coal mines. Specifically, the objective of the project was to investigate various installation options for fibre-optic cable along the conveyor belt in order to identify the most effective design. The project was consisted of site trials and laboratory experiments to examine the performance of the DTS system for different cable installation designs and to characterise the behaviour of the DTS system.The results of the site trials and laboratory experiments proved that the fibre optic-based DTS system is a suitable monitoring system for conveyor belts that can accurately and in real-time identify the faulty idlers that generate heat. The location of the fibre-optic cable with respect to the heated idler plays an important role in the sensitivity and reliability of such a monitoring system. Conduction heat transfer was the only means of heat transfer by which the temperature rise of the faulty idler could be sensed. The fibre-optic cable should be attached to the frame of the idler and as close as possible to the bearing without interfering with the conveyor operation and maintenance.There was a trade-off between the accuracy and response time of the temperature measurements, and the simplicity of the fibre-optic cable installation. The results of the Kestrel North coal mine test proved that the DTS monitoring system is able to provide a real-time temperature profile of the conveyor belt structure and the surrounding area so that the operator can observe the roadway temperature conditions and make critical decisions in serious situations.ii

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Distributed temperature measurements using optical fibre technology in an underground mine environment

Cited by 32 publications

References 22 publications

Crack Risk Evaluation of Early Age Concrete Based on the Distributed Optical Fiber Temperature Sensing

Crack Risk Evaluation of Early Age Concrete Based on the Distributed Optical Fiber Temperature Sensing

A dynamic evaluation technique for assessing gas output from coal seams during commingling production within a coalbed methane well: a case study from the Qinshui Basin

Fibre optic conveyor monitoring system

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