2026-06-28T10:32:54Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/926712025-09-02T12:34:34Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Fernández Medina, Ana author Frövel, Malte author López Heredero, Raquel author Belenguer, Tomás author Belenguer Dávila, Tomás author de la Torre, Antonia author Moravec, Carolina author San Julián, Ricardo author Gonzalo, Alejandro author Cebollero, María author Álvarez-Herrero, Alberto author 2023 A composite optical bench made up of Carbon Fiber Reinforced Polymer (CFRP) skin and aluminum honeycomb has been developed for the Tunable Magnetograph instrument (TuMag) for the SUNRISE III mission within the NASA Long Duration Balloon Program. This optical bench has been designed to meet lightweight and low sensitivity to thermal gradient requirements, resulting in a low Coefficient of Thermal Expansion (CTE). In addition to the flight model, a breadboard model identical to the flight one has been manufactured, including embedded fiber Bragg temperature and strain sensors. The aim of this is to explore if the use of distributed fiber Bragg gratings (FBGs) can provide valuable information for strain and temperature mapping of an optical instrument on board a space mission during its operation as well as its on-ground testing. Furthermore, surface-mounted strain FBG sensors and thermocouples have been installed in the optical bench for intercomparison purposes. This paper presents the results obtained from a thermal vacuum test consisting of three thermal cycles with stabilization steps at 100 °C, 60 °C, 20 °C and −20 °C. Experimental results provide information about how FBG embedded temperature sensors can provide a proper and quick response to the temperature changes of the optical bench and that embedded FBG strain sensors are able to measure micro-deformation induced in a close-to-zero CTE optical bench. Fernández-Medina, A.; Frövel, M.; López Heredero, R.; Belenguer, T.; de la Torre, A.; Moravec, C.; San Julián, R.; Gonzalo, A.; Cebollero, M.; Álvarez-Herrero, A. Embedded Fiber Bragg Grating Sensors for Monitoring Temperature and Thermo-Elastic Deformations in a Carbon Fiber Optical Bench. Sensors 2023, 23, 6499. 1424-8220 10.3390/s23146499 https://hdl.handle.net/20.500.14352/92671 https://doi.org/10.3390/s23146499 https://www.mdpi.com/1424-8220/23/14/6499 Embedded Fiber Bragg Grating Sensors for Monitoring Temperature and Thermo-Elastic Deformations in a Carbon Fiber Optical Bench