What is it about?
We developed an optical fiber cable capable of measuring pressure with high sensitivity and high-spatial resolution. The cable relies on a transducing mechanism that converts the pressure into strain, which can be measured with a standard distributed strain sensing (DSS) technique. For example, by using a DSS interrogator with 1 με resolution, the cable can measure the pressure with a resolution and accuracy of approximately 5 Pa and 10 hPa, respectively. Its intrinsic maximum spatial resolution is 8.5 cm, but the cable can be used also with a DSS with coarse resolution.
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Why is it important?
This is the first example of a cable for distributed pressure sensors with such high sensitivity and based on standard single-mode fibers. Furthermore, it is compatible with any DSS interrogator, either Rayleigh- or Brillouin-based ones.
Perspectives
This work may be lead to several other works on DPS cables, relying on SMF. Feasible solutions for the pressure range addressed by this work (equivalent to a few meters of H2O) were sought for a long time, with no success.
Dr Luca Schenato
National Research Council Italy
Read the Original
This page is a summary of: An Optical Fiber Distributed Pressure Sensing Cable with Pa-Sensitivity and Enhanced Spatial Resolution, IEEE Sensors Journal, January 2020, Institute of Electrical & Electronics Engineers (IEEE),
DOI: 10.1109/jsen.2020.2972057.
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