Cryogenic Temperature Measurement Using Rayleigh Backscattering Spectra Shift by OFDR

Du, Yu; Liu, Tiegen; Ding, Zhenyang; Han, Qun; Liu, Kun; Chen, Qinnan; Feng, Bowen

doi:10.1109/lpt.2014.2317702

Cited by 38 publications

(7 citation statements)

References 9 publications

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“…Due to the grating process, FBG fibers are also more expensive. Conversely, measurements using Rayleigh backscattering can be taken with low-cost standard single-mode optical fibers [19], but data processing is more elaborate for this method. At the test rig 14 Rayleigh fibers with a length up to 20 m are applied, allowing temperature measurements between -196 °C and 50 °C with an accuracy of 3 °C at intervals of a few mm along the fibers [7].…”

Section: Methodsmentioning

confidence: 99%

“…Distributed temperature measurements using optical fibers have been successfully applied in numerous different fields such as long-distance environmental monitoring [20] and nuclear power plants [21]. Also, fiber optical sensors have been used under cryogenic conditions [19], especially in the area of superconducting technology (e.g., [22]). Reviews of distributed temperature-sensing technology and applications can be found in [20,23,24].…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Distributed Temperature and Strain Measurements at a Cryogenic Plate‐Fin Heat Exchanger Test Rig

Fritsch

Hoffmann

Flüggen

et al. 2021

Chemie Ingenieur Technik

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A large cryogenic test rig was built to investigate dynamic operation of plate-fin heat exchangers, which is needed for flexible operation of air separation units. This paper presents results from distributed temperature and strain measurements that were conducted during a dynamic test scenario. Results show that strong temperature gradients appear in all spatial directions of the heat exchangers, resulting in locally varying strains. It is shown that spatially dissolved, dynamic strain measurements are possible using optical fibers. Results from the test rig will help to properly instrument heat exchangers in research and in the field and provide important information for design and operation of plate-fin heat exchangers in dynamic processes.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Distributed Temperature and Strain Measurements at a Cryogenic Plate‐Fin Heat Exchanger Test Rig

Fritsch

Hoffmann

Flüggen

et al. 2021

Chemie Ingenieur Technik

View full text Add to dashboard Cite

show abstract

“…Once the process is not handled properly, transmission loss will increase and distributed fiber strain measurement will be exposed to ultra-low temperatures [6] . So far, there are some reports on distributed optical fiber temperature sensing in ultra-low temperature environments, while strain measurements in ultralow temperature environments have been rarely reported [7][8] . The cross sensitivity of distributed optical fiber to temperature and strain restricts the application of this technique in the field of strain sensing under ultra-low temperature [9] .…”

Section: Introductionmentioning

confidence: 99%

Distributed optical fiber strain sensing under ultra-low temperature based on Rayleigh backscattering

Liu,

Ru,

Wang

et al. 2023

3rd International Conference on Laser, Optics, and Optoelectronic Technology (LOPET 2023)

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A distributed optical fiber strain sensing under ultra-low temperature based on Rayleigh Backscattering light was realized in this paper. An auto correlation demodulation technique was used to improve the measurement accuracy. The optical fiber's displacement caused by ultra-low temperature environment was corrected during the auto correlation operation. A temperature compensation Technology based on Fiber Bragg Grating Sensing was proposed, which could effectively compensate the impact of thermal expansion of the structure on the distributed optical fiber. The technique can adapt to the measuring environment with large temperature changes, and significantly improve the accuracy of strain measurement.

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“…The spectra shift of the Optical Frequency Domain Reflectometry (OFDR) was used to monitor a cryogenically cooled cable at 15 K [13]. The same technology was demonstrated to have a similar sensitivity at 77 K and room temperature in a subsequent study [14]. More recently, the OFDR technology was tested with an optical fiber embedded inside a REBCO CORC ® cable for quench detection [15] [16].…”

Section: Introductionmentioning

confidence: 99%

Distributed Fiber Optic Sensing to Identify Locations of Resistive Transitions in REBCO Conductors and Magnets

Luo

Ferracin

Stern

et al. 2022

IEEE Trans. Appl. Supercond.

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High-temperature superconductors such as REBa2Cu3O7-x (REBCO, RE = rare earth) can generate strong magnetic fields that are promising for applications in particle accelerators and compact fusion reactors. Traditionally, voltage taps are installed in superconducting magnets to measure the voltage signals due to resistive transitions. The voltage-tap-based diagnostics is important for the development of magnet technology as it can help pinpoint the locations in the magnet windings that limit the magnet performance. The architecture of the multi-tape REBCO cable such as CORC ® wires, however, makes it difficult to apply the voltage-tapbased diagnostics to identify the locations of resistive transitions. Distributed fiber optic sensing (DFOS) has the potential to address this issue. In this paper, we report the measurements of thermal strain along a CORC ® wire based on optical frequency domain reflectometry with a maximum spatial resolution of 0.65 mm and a temporal resolution of 10 Hz. The optical fiber is co-wound with the CORC ® wire that is epoxy impregnated. During the test, current was increased until a resistive transition occurred in the conductor. The spectrum shift of the reflected light along the fiber was recorded.The results suggested that with proper thermal isolation from the cryogen, DFOS can be used to identify the locations of resistive transitions in CORC ® wires and magnets. The results will allow a better understanding of the causes of resistive transitions in REBCO conductors and magnets, which will help improve the REBCO magnet technology.

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Cryogenic Temperature Measurement Using Rayleigh Backscattering Spectra Shift by OFDR

Cited by 38 publications

References 9 publications

Distributed Temperature and Strain Measurements at a Cryogenic Plate‐Fin Heat Exchanger Test Rig

Distributed Temperature and Strain Measurements at a Cryogenic Plate‐Fin Heat Exchanger Test Rig

Distributed optical fiber strain sensing under ultra-low temperature based on Rayleigh backscattering

Distributed Fiber Optic Sensing to Identify Locations of Resistive Transitions in REBCO Conductors and Magnets

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