TY - JOUR A1 - Hopf, Barbara A1 - Dutz, Franz J. A1 - Bosselmann, Thomas A1 - Willsch, Michael A1 - Koch, Alexander W. A1 - Roths, Johannes T1 - Iterative matrix algorithm for high precision temperature and force decoupling in multiparameter FBG sensing T2 - Optics Express N2 - A new iterative matrix algorithm has been applied to improve the precision of temperature and force decoupling in multi-parameter FBG sensing. For the first time, this evaluation technique allows the integration of nonlinearities in the sensor’s temperature characteristic and the temperature dependence of the sensor’s force sensitivity. Applied to a sensor cable consisting of two FBGs in fibers with 80 μm and 125 μm cladding diameter installed in a 7 m-long coiled PEEK capillary, this technique significantly reduced the uncertainties in friction-compensated temperature measurements. In the presence of high friction-induced forces of up to 1.6 N the uncertainties in temperature evaluation were reduced from several degrees Celsius if using a standard linear matrix approach to less than 0.5°C if using the iterative matrix approach in an extended temperature range between −35°C and 125°C. KW - Bragg-Reflektor KW - Photonik Y1 - 2022 UR - https://opus4.kobv.de/opus4-hm/frontdoor/index/index/docId/334 UR - https://nbn-resolving.org/urn:nbn:de:bvb:m347-opus-3345 N1 - Sonderdruck aus: Optics Express; Volume 26, No. 9 (2018), S. 12092-12105 VL - 26 IS - 9 SP - 12092 EP - 12105 ER -