An optical hot-wire flow sensing grid is presented using a single piece of self-heated optical fiber to perform distributed flow measurement. The flow-induced temperature loss profiles along the fiber are interrogated by the in-fiber Rayleigh backscattering, and spatially resolved in millimeter resolution using optical frequency domain reflectometry (OFDR).
The flow rate, position, and flow direction are retrieved simultaneously. Both electrical and optical on-fiber heating were demonstrated to suit different flow sensing applications.
Citation
Tong Chen, Qingqing Wang, Botao Zhang, Rongzhang Chen, and Kevin P. Chen, "Distributed flow sensing using optical hot -wire grid," Opt. Express 20, 8240-8249 (2012)
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