This is my archive

Our first German-language article!

We are pleased to present the first German-language article describing the capabilities of composite monolithic sensors in monitoring reinforced and prestressed concrete structures!

📖📖📖 Enjoy your reading!

Distributed strain measurements of prestressed concrete elements with fibre optic sensors – abstract

The article presents the application of the technology of distributed strain measurements to prestressed concrete members. Distributed fibre optic sensing technology is based on light backscattering and enables strain measurements with high spatial resolution over the entire length of the optical fibre. Such an approach allows the replacement of thousands of conventional spot strain gauges, arranged in series, with a single optical fibre. The article presents composite fibre optic sensors and their application for strain measurements and cracks development investigations. Three practical examples of prestressed concrete elements were described, namely truck scale platforms, prestressed concrete girders with a length of 24 meters, and one of the largest bridges in Poland. The structural members were analysed at different stages of construction, during fabrication and hardening, tendon activation, installation, proof loading, and also as a post-installed measurement system. The aim of this article was to demonstrate the possibilities of measurements with composite distributed fibre optic sensors.

New paper in Measurement!

Good news! 🙂
We encourage you to read the new article in Measurement, Elsevier.
EpsilonSensor was embedded directly into a concrete slab to monitor extremely high crack-induced strains. Also, DFOS fibres allowed for detailed analysis of post-yielding behaviour of reinforcing bars in slab-column RC system during column failure simulation.

Thanks to Politechnika Rzeszowska im. Ignacego Łukasiewicza for this impressive research and fruitfull cooperation! 👏

📖📖📖 Read the article HERE.

ABSTRACT

Flat slab systems made of reinforced concrete (RC) are popular structural solutions widely used in practical applications. The knowledge about their behaviour under extreme loading conditions, including the loss of the columns, is still being developed worldwide. Also, new materials are tested for this purpose. The research presented hereafter in the article includes the progressive collapse simulation caused by removing the external column in the flat slab system reinforced with B600B steel. One of the aims of the research was to assess the effectiveness of the applied reinforcement after losing the column, depending on the degree of horizontal tie reinforcement. The structural behaviour of the entire reinforced concrete system during the experiment was controlled using advanced reference techniques, including distributed fibre optic sensing DFOS, optical image correlation system, total station as well as conventional strain and displacement transducers. The article focuses on the possibilities of DFOS sensing in an extensive range of strains caused by the steel yielding and the cracks directly in concrete. Thanks to distributed measurements and monolithic composite sensors, it was possible to detect all the cracks and reflect their patterns during all load stages until structural failure. The article describes the methodology and discusses the results of this pioneer measurement approach. Despite the extensive state of the art in distributed sensing, the paper provides the new knowledge gained during research. It is mainly related to a DFOS-based solution for extremely high strain measurements thanks to the excellent bonding properties and strain transfer to the optical fibre, from both steel reinforcement and surrounding concrete.

Nerve-Sensors on Luna’s blog!

It’s a great pleasure for us to present applications for Nerve-Sensors with Luna Innovations’ ODiSI high-definition optical interrogator. The performance of the entire DFOS system is always based on the quality of both the sensors and the datalogger.

With Luna’s HD-FOS technology, Nerve-Sensors have been deployed in a wide range of civil and geotechnical structures for accurate and reliable measurements of strains, cracks, stress, displacements, vibrations, or temperatures!

Looking forward to new exciting projects! 🤝💪😃

📖📖📖 Read more on Luna’s blog!

Deltares project in Netherlands

Nerve-Sensors in action again! This time our team is working in Deltares equipping the piled embankment test facility with our EpsilonSensors and custom-made 3DSensors grids. This challenging and engaging research is conducted within the GEOLAB Project together with other partners: KELLER and Technische Universität Darmstadt.

Our team delivered sensors and supervised their installation process. After a few weeks of intensive research and measurements, distributed strain and displacement data are now under processing. We are excited and looking forward to the first results!

Nerve-Sensors in California, USA!

We are very excited about our new project in California, USA. Nerve-Sensors was used to create the world’s first smart bridge at this scale. Thousands of meters of sensors were integrated into the structure.

Our team participated in developing the conceptual design of bridge monitoring as well as supervised the installation of sensors in piers. We want to thank the entire DarkPulse Inc and Optilan team for collaboration within the first stage of the project.

We will share with you more details and a short Case-Study of the project implementation in California soon!

Four Nerve-Sensors installed in the pier.
Meet us at EWSHM 2022 in Palermo!

Meet us at the 10th European Workshop on Structural Health Monitoring in Palermo, Italy. Nerve-Sensors will be one of the conference exhibitors and author of the scientific publication.

This Workshop will represent a forum where experts from around the world discuss the latest advancements and breakthroughs in the field of SHM and more broadly in the fields of nondestructive evaluation, smart materials and intelligent systems. The Workshop will foster the discussion and identification of key and emerging challenges and opportunities in research, development, and field applications.
For more information please visit the event website.

Proceedings of CSHM-8 Workshop

Nerve-Sensors Team presented a paper about 3DSensor during the 8th Civil Structural Health Monitoring Workshop (CSHM-8), held on March 31–April 2, 2021. The workshop represented a forum where experts from around the world discuss the latest advancements and breakthroughs in the field of civil structural health monitoring (SHM) and more broadly in the fields of smart materials and intelligent systems for civil engineering applications. The main theme of the Workshop was “Ageing structures and infrastructures in hazardous environment”.

Our article „Possibilities of Composite Distributed Fibre Optic 3DSensor on the Example of Footing Pulled Out from the Ground: A Case Study” has been printed in the conference proceedings written by leading experts in the field and published by Springer. The paper is available for purchase here: SpringerLink

Merry Christmas!

Merry Christmas and a Happy New Year! SHM System team wishes you cheerful, jolly, and peaceful moments spent with your family.
Warmest thoughts and best wishes for a wonderful Holiday!

EpsilonRebar at „Dni Betonu” 2021

Our DFOS monitoring system was presented by TPA Sp. z o.o. company on the second day of the event during the „Concrete in Infrastructure” session. This project involved a 100 m section of the A1 highway in Poland, which was reinforced with only composite rebars, and our EpsilonRebar sensors. Our sensors provided crucial information about the formation of strains and cracks while at the same time structurally reinforcing the road.

You can watch the whole presentation below in 2:09:30

Again in Sensors!

The article presents a new approach to monitor displacements and strains in Glass Fiber Reinforced Polymer (GFRP) collectors and pipelines using DFOS. Sensing fibres were installed over the circumference of a composite pipe, both on the internal and external surfaces. Analysis of measured strain profiles allowed for calculating the actual displacements (shape) of the structure using the trapezoidal method known from our 3DSensor.