Technical aspects of optical fibre distributed temperature sensing

1997 ◽  
Author(s):  
null
Keyword(s):  
Optical Fibre ◽  
Temperature Sensing ◽  
Distributed Temperature Sensing ◽  
Technical Aspects

A method for extensive spatiotemporal assessment of soil temperatures during an experimental fire using distributed temperature sensing in optical fibre

2018 ◽  
Vol 27 (2) ◽  
pp. 135 ◽  
Author(s):  
Ryan Tangney ◽  
Nader A. Issa ◽  
David J. Merritt ◽  
John N. Callow ◽  
Ben P. Miller
Keyword(s):  
Spatial Resolution ◽  
Optical Fibre ◽  
Fire Ecology ◽  
Temperature Sensing ◽  
Measurement Unit ◽  
Data Visualisation ◽  
Fuel Reduction ◽  
Distributed Temperature Sensing ◽  
Soil Temperatures ◽  
Ecological Applications

The use of distributed temperature sensing (DTS) for ecological applications has increased rapidly in the last 6 years. Here we demonstrate the first use of DTS to measure soil temperatures during a fuel reduction burn – in an urban grassy Tuart–Banksia woodland remnant near Perth, Western Australia. Optical fibre with an acrylate material coating (diameter 242μm), but no other jacketing or cabling, was buried in the soil at depths between 0 and 5cm. Measurements were recorded over 316m of optical fibre using a DTS measurement unit, providing data over a 5.5-h period at 20-s intervals; resulting in 1243 temporal measurements at 60-cm spatial resolution. Soil temperatures were calibrated to an error of±6.8% at 250°C. Methods for installation, calibration and data visualisation are presented. Issues associated with assessment of DTS data in a fire ecology context are discussed.

High-spatial-resolution Distributed Temperature Sensing System Based on a Mode-locked Fiber Laser

2020 ◽  
Author(s):  
Anton O. Chernutsky ◽  
Dmitriy A. Dvoretskiy ◽  
Ilya O. Orekhov ◽  
Stanislav G. Sazonkin ◽  
Yan Zh. Ososkov ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Temperature Sensing ◽  
Distributed Temperature Sensing ◽  
Sensing System

scholarly journals Thermodynamics of a fast-moving Greenlandic outlet glacier revealed by fiber-optic distributed temperature sensing

2021 ◽  
Vol 7 (20) ◽  
pp. eabe7136
Author(s):  
Robert Law ◽  
Poul Christoffersen ◽  
Bryn Hubbard ◽  
Samuel H. Doyle ◽  
Thomas R. Chudley ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Basal Layer ◽  
Temperature Sensing ◽  
Distributed Temperature Sensing ◽  
Catchment Scale ◽  
Outlet Glacier ◽  
Coarse Spatial Resolution ◽  
High Vertical Resolution ◽  
Fast Motion ◽  
Strain Heating

Measurements of ice temperature provide crucial constraints on ice viscosity and the thermodynamic processes occurring within a glacier. However, such measurements are presently limited by a small number of relatively coarse-spatial-resolution borehole records, especially for ice sheets. Here, we advance our understanding of glacier thermodynamics with an exceptionally high-vertical-resolution (~0.65 m), distributed-fiber-optic temperature-sensing profile from a 1043-m borehole drilled to the base of Sermeq Kujalleq (Store Glacier), Greenland. We report substantial but isolated strain heating within interglacial-phase ice at 208 to 242 m depth together with strongly heterogeneous ice deformation in glacial-phase ice below 889 m. We also observe a high-strain interface between glacial- and interglacial-phase ice and a 73-m-thick temperate basal layer, interpreted as locally formed and important for the glacier’s fast motion. These findings demonstrate notable spatial heterogeneity, both vertically and at the catchment scale, in the conditions facilitating the fast motion of marine-terminating glaciers in Greenland.

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