Testing of Optoelectronic Components for integration into Space – Oriented Fiber Bragg Grating
S. Abad 1, F. Araújo 1, J. Barbero 2, P. Adamiec 2, D. López 2, J. González-Torres 3, J. Velasco 3, I. McKenzie 4 1 FiberSensing, Advanced Monitoring Systems, Portugal 2 ALTER TECHNOLOGY TÜV NORD S.A.U., Spain 3 CRISA, Spain 4 ESA-ESTEC, Netherlands
Spacecraft structural health-monitoring applications are pushed forward by increased constraints in the cost of launching payloads into orbit that dictates major reduction in structural weight only attained through the use of advanced materials and innovative manufacturing methods.
On the other hand, the reduction in structural weight must be tempered against the increased demands on performance, damage tolerance, and lifetime durability . The present paper introduces a demonstrator that shall perform temperature measurements by means of Fiber Bragg Grating (FBG) optic sensors. The aim of the work being undertaken is, on one side, to demonstrate the advantages of using this technology with respect to present temperature monitoring techniques in both telecom satellite and launcher applications, and on the other side to reach the TRL-5 Technology Maturity for Crisa and FiberSensing.
Towards this goal, several optoelectronic components are being tested following space requirements in order to be integrated as part of the FBG systems under development. These pre-validation tests are being carried out in collaboration with ALTER Technologies, and are meant to de-risk the full system development plan from the early design stages. This paper presents a description of the system focused on the use of optical components.
FIBER OPTIC SENSING
The Fiber Optic Sensing (FOS) system under development is a measurement system composed by FBG sensors, optical harness and an interrogation unit, whose interfaces are compatible with the existing thermal monitoring system so it can be used as a replacement for the latter. FOS technology can be used for measuring other analog parameters (strain, displacement, acceleration, inclination, pressure) using the same interrogation unit, by adding different types of FBG sensors.
A fiber Bragg grating is a small size microstructure (less than 10 mm long) that can be photo-imprinted in photosensitive optical fibers by side-exposure to patterned UV laser radiation.