Fiber Bragg Grating-Based Temperature Distribution Evaluation of Multilayer Insulations Between 300 K–77 K

Ramalingam, R.; Neumann, H.

doi:10.1109/jsen.2010.2078496

Cited by 12 publications

(2 citation statements)

References 14 publications

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“…This is possible if each ultrasound pulse produced multiple ultrasound reflections, caused by echogenic features encountered as it propagates through a sample. In an approach reminiscent to the Bragg grating of optical fibers (see, for example, [11]), Hanscombe and Richards [12] proposed a method in which an ultrasound waveguide is engineered to have regions of periodic ultrasound gratings, each producing echoes with different dominant frequencies determined by grating dimensions. Thermal expansion/contraction change these dimensions and, therefore, shift the frequency content of the echoes.…”

Section: Introductionmentioning

confidence: 99%

Ultrasound measurements of segmental temperature distribution in solids: Method and its high-temperature validation

2016

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A novel approach that uses noninvasive ultrasound to measure the temperature distribution in solid materials is described and validated in high-temperature laboratory experiments. The approach utilizes an ultrasound propagation path with naturally occurring or purposefully introduced echogenic features that partially redirect the energy of an ultrasound excitation pulse back to the transducer, resulting in a train of echoes. Their time of flight depends on the velocity of ultrasound propagation, which changes with temperature distribution in different segments of the propagation path. We reconstruct segmental temperature distributions under different parameterizations. Several parameterizations are discussed, including piecewise constant and piecewise linear, and the parametrization that requires that the estimated temperature profile satisfies an appropriate heat conduction model. The experimental validation of the proposed approach with an alumina sample shows that even with simple parameterizations, the temperature profile is correctly captured with an accuracy that may be comparable to that of the traditional pointwise sensors. The advantages of the approach are discussed, including its suitability for real time and non-destructive temperature measurements in extreme environments and locations inaccessible to the traditional insertion sensors.

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Section: Introductionmentioning

confidence: 99%

Ultrasound measurements of segmental temperature distribution in solids: Method and its high-temperature validation

2016

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“…This brings to the fore a need for a small sized sensor that can be used to measure cryogenic temperatures. Previously Fiber Bragg Grating (FBG) sensors have been used to evaluate the temperature distribution of multilayer insulation [7]. In the present study, Bragg gratings fabricated at different locations in a single fiber is used for temperature measurement inside the TIT heat exchanger.…”

Section: Introductionmentioning

confidence: 99%

Fiber Bragg Gratings for distributed cryogenic temperature measurement in a tube in tube helically coiled heat exchanger

Bharathwaj¹,

Markan

Atrey

et al. 2014

IEEE SENSORS 2014 Proceedings

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A novel technique to measure the cryogenic temperature distribution of a helically coiled Tube-in-Tube (TIT) heat exchanger using Fiber Bragg Grating (FBG) array has been reported. The measured temperature distribution will help in estimating the heat exchanger efficiency and will be used to investigate its performance. The measurement of the temperature distribution has previously only been simulated, as using a standard temperature sensor would inadvertently hamper the flow. This issue can be solved by using a small sized FBG sensor array. In this paper, the principle, design and installation of sensors are explained and the initial experiments are carried out to demonstrate the measurement technique. The experimentally measured temperature distribution was found to be agreeable with the simulated values with minor deviations.

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Strain Calibration of Substrate-Free FBG Sensors at Cryogenic Temperature

Venkatesan

Weiss

Bharti

et al. 2016

Internet of Things. IoT Infrastructures

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Fiber Bragg Grating-Based Temperature Distribution Evaluation of Multilayer Insulations Between 300 K–77 K

Cited by 12 publications

References 14 publications

Ultrasound measurements of segmental temperature distribution in solids: Method and its high-temperature validation

Ultrasound measurements of segmental temperature distribution in solids: Method and its high-temperature validation

Fiber Bragg Gratings for distributed cryogenic temperature measurement in a tube in tube helically coiled heat exchanger

Strain Calibration of Substrate-Free FBG Sensors at Cryogenic Temperature

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