Innovative sensor networks for massive distributed thermal measurements in space applications under different environmental testing conditions

Aimasso, Alessandro; Vedova, Matteo Davide Lorenzo Dalla; Maggiore, Paolo

doi:10.1109/metroaerospace54187.2022.9856275

Cited by 9 publications

(4 citation statements)

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“…The aged sample is exclusively subjected to changes in temperature, while the newest is subjected to both changes in temperature and strain due to settlement. Considering the linear correlation between Δλ and Δε and ΔT [1][2][3], the Δλ T in the newest sample is equivalent to the λ in the aged sample, the latter can be subtracted from the λ in the newest sample. Thus we are left with λ ε of the newest sample:…”

Section: Test Campaignmentioning

confidence: 99%

Analysis of the fixing process of FBG optical sensors for thermomechanical monitoring of aerospace applications

Aimasso

Vedova

Esposito

et al. 2023

J. Phys.: Conf. Ser.

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In aerospace, lots of components can be defined as “safety critical”. As a result, it is crucial to early identify the failure precursors when the effects on the systems performances are still practically insignificant. For this reason, complex networks of sensors had been developed and integrated into different parts to monitor several operational parameters, useful for evaluating their health (such as such as temperatures, displacements, vibrations, etc). Clearly, due to the importance of data collected, the technology employed shall be very reliable, even while working in harsh environments. Sensors based on optical fiber Bragg grating (FBG) meet these requirements. However, the fiber’s integration process in the considered system is really crucial, from the moment that it could influence the sensors output. In this regard, gluing the optical sensors is really a critical activity, because the effects of the glue’s retire and its viscous assessment shall be analysed and quantified. In this work, it was done by comparing performances of two equal samples, each one with an FBG glued on it. The first sample was prepared about two months before the second one. Furthermore, data from both FBG have been collected from the gluing phase of the second sample and in the following days. The results showed that the assessment of the resin evolved in different phases, but all of them were united by the fact that the overall process makes sensors measures not reliable during this specific transitory phase. By observing the evolution of the linear fit gradients, it can be stated that the variations reached their maximum in the middle of the gluing process, when the fiber was detached from the tensioning device. Finally, at the end of the overall process, data output resulted stable, so making FBG employable for reliable thermal or strain measures.

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Section: Test Campaignmentioning

confidence: 99%

Analysis of the fixing process of FBG optical sensors for thermomechanical monitoring of aerospace applications

Aimasso

Vedova

Esposito

et al. 2023

J. Phys.: Conf. Ser.

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“…For example, it is a highly light and less intrusive material, resulting in substantial weight savings in tiny component instrumentation. Furthermore, the tiny size of the fiber's cable section, along with the ability to install many sensors on the same communication line, helps decrease disturbances, especially during thermal testing [23]. Another critical component is the optical fiber's resistance to electromagnetic interference.…”

Section: Optical Fiber and Fbg Sensorsmentioning

confidence: 99%

Sensitivity analysis of FBG sensors for detection of fast temperature changes

Aimasso,

Vedova,

Maggiore

2023

J. Phys.: Conf. Ser.

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In the last few decades, the use of optical fiber is becoming more widespread for communication technologies and sensor applications. In this sense, considering the physical characteristics of the fiber, there are many possibilities for its use in various engineering sectors, not least in the aerospace one. Indeed, using optical fibers to replace traditional electronic devices can provide significant advantages, such as using an extremely lightweight and minimally invasive technology. FBG (Fiber Bragg Grating) sensors are ones of the most widely used instruments for this purpose, and they allow the detection of different physical parameters, including temperature. The aim of the present work is to analyze the performances of FBGs, in particular by evaluating their ability to read short-term thermal transients and comparing it with that of a conventional thermal probe (PT100). More specifically, two optical fibers were used: the first with the FBG sensor area covered by the external coating and the second without this outer layer. All instrumentation was placed in a climatic chamber and subjected to different thermal cycles. Furthermore, the fiber sections with FBGs were not placed directly in contact with the plate on which they were installed. This made it possible to put optical sensors indications that were as independent as possible from the materials on which they were mounted. Tests have shown that optical sensors have an extremely high sensitivity and a much shorter reaction time than the PT100 probe. Data collected by this work allow strategic use of FBG for thermal monitoring using a minimally invasive and extremely accurate technology.

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“…Aimasso et al have constructed FBG networks to monitor the temperature distribution of Multi-Layer Insulation (MLI) blankets, which can aid in optimizing the thermal regulation of the spacecraft. 12,13 Thermoforming is one of the dominant methods for fabricating smart composites embedded with FBG sensors. It primarily involves three steps: prepreg stacking and FBG interlayer laying, preforming, and curing, as shown in Figure 2.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, FBG sensors are also increasingly applied in the space domain. Aimasso et al have constructed FBG networks to monitor the temperature distribution of Multi‐Layer Insulation (MLI) blankets, which can aid in optimizing the thermal regulation of the spacecraft 12,13 …”

Section: Introductionmentioning

confidence: 99%

Influence of processing parameters on the resin pocket geometry of smart composites embedded with Fiber Bragg Grating sensor and its fast prediction

Zhao,

Zhang,

Liu

et al. 2024

Polymer Composites

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Smart composites embedded with Fiber Bragg Grating (FBG) sensors are getting increasingly popular in aircraft structures due to their self‐sensing and monitoring capability. However, a resin pocket around the FBG sensor would be formed in the manufacturing process, which strongly impacts the mechanical properties of the composite host. Therefore, the influence of primary processing parameters (FBG orientation angle, preforming temperature, and preforming pressure) on the formation of resin pockets was investigated in this work. It is found that there is a sinusoidal relation between the resin pocket geometry and the FBG orientation angle. A negative linear relation is noted between the resin pocket geometry and the preforming temperature and pressure. A prediction model based on the backpropagation neural network (BPNN) was established, which was able to quickly and accurately predict resin pocket geometry subjected to given processing parameters. This work provides useful guidance for the processing control of smart composites embedded with FBG sensors.Highlights Resin pocket geometry was formed primarily in the preforming stage. Effect of processing parameters on resin pocket geometry was characterized. A BPNN model was established for the fast prediction of resin pocket geometry.

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Innovative sensor networks for massive distributed thermal measurements in space applications under different environmental testing conditions

Cited by 9 publications

References 0 publications

Analysis of the fixing process of FBG optical sensors for thermomechanical monitoring of aerospace applications

Analysis of the fixing process of FBG optical sensors for thermomechanical monitoring of aerospace applications

Sensitivity analysis of FBG sensors for detection of fast temperature changes

Influence of processing parameters on the resin pocket geometry of smart composites embedded with Fiber Bragg Grating sensor and its fast prediction

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