Beisenova Aidana, Issatayeva Aizhan, Sovetov Sultan, Korganbayev Sanzhar, Jelbuldina Madina, Ashikbayeva Zhannat, Blanc Wilfried, Schena Emiliano, Sales Salvador, Molardi Carlo, Tosi Daniele
Nazarbayev University, Department of Electrical and Computer Engineering, 010000 Astana, Kazakhstan.
Laboratory of Biosensors and Bioinstruments, National Laboratory Astana, 010000 Astana, Kazakhstan.
Biomed Opt Express. 2019 Feb 19;10(3):1282-1296. doi: 10.1364/BOE.10.001282. eCollection 2019 Mar 1.
We propose a setup for multiplexed distributed optical fiber sensors capable of resolving temperature distribution in thermo-therapies, with a spatial resolution of 2.5 mm over multiple fibers interrogated simultaneously. The setup is based on optical backscatter reflectometry (OBR) applied to optical fibers having backscattered power significantly larger than standard fibers (36.5 dB), obtained through MgO doping. The setup is based on a scattering-level multiplexing, which allows interrogating all the sensing fibers simultaneously, thanks to the fact that the backscattered power can be unambiguously associated to each fiber. The setup has been validated for the planar measurement of temperature profiles in radiofrequency ablation, obtaining the measurement of temperature over a surface of 96 total points (4 fibers, 8 sensing points per cm). The spatial resolution obtained for the planar measurement allows extending distributed sensing to surface, or even three-dimensional, geometries performing temperature sensing in the tissue with millimeter resolution in multiple dimensions.
我们提出了一种用于多路复用分布式光纤传感器的设置，该设置能够解析热疗中的温度分布，在同时询问的多根光纤上具有2.5毫米的空间分辨率。该设置基于光学背向散射反射测量法（OBR），应用于通过氧化镁掺杂获得的背向散射功率明显大于标准光纤（36.5分贝）的光纤。该设置基于散射级复用，由于背向散射功率可以明确地与每根光纤相关联，因此可以同时询问所有传感光纤。该设置已在射频消融中对温度分布的平面测量进行了验证，在总共96个点（4根光纤，每厘米8个传感点）的表面上获得了温度测量结果。平面测量获得的空间分辨率允许将分布式传感扩展到表面甚至三维几何结构，以毫米分辨率在多个维度上对组织进行温度传感。
