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MOS is shortlisted in the category *Product and Innovation Award* in the Ground Engineering Awards 2016 for our works at Crossrail's Farringdon Station

Solutions using Optical Sensors

Continuous Monitoring with Optical Sensors

Our monitoring systems typically integrate a set of FBG optical sensors, a network of optical cables, an opto-electronic interrogation unit, and an industrial PC with a wireless data transmission module. The acquisition and processing of monitoring data follow a schedule specific to your needs and are controlled by a custom developed software application. Static or dynamic measurements can be made at regular intervals or triggered by traffic loads, for example. The relevant information is then transmitted at defined intervals via a GPRS link (mobile phone network) to a central database server. Authorised users can access the database via the Internet, using a standard web-browser, to visualise measurement results on-line or download data sets for off-line analysis. Data or alert messages can also be sent to you via email or SMS. The complete monitoring system functions continuously, independently, and indefinitely, providing you with valuable information regarding the behaviour of your asset, 24 - 7.

Bridge Monitoring Systems

A fibre optic long term monitoring system has been designed and installed to generate strain signatures. The system is capable to detect the structural performance of a bridge and also to record the traffic patterns. The data received enables competent authorities to study effective maintenance procedures and to implement new access policies.

Installing a Monitor Optics system on your bridge will allow you to; analyse traffic loading over time, determine the rate of structural deterioration, detect structural element failure, identify when critical maintenance is required, assess the effects of structural improvements, and develop an efficient bridge maintenance regimen

Detect failures
Detect when critical maintenance is required
Assess the effect of structural improvements
Determine the rate of structural deterioration
Determine traffic patterns
Aid in the development of maintenance and access regimen

Monitoring Systems for Buildings

A fibre optic long term monitoring system has been designed and installed to automate daily measurement of displacements between main structural components within a building. Short gauge sensors are deployed to monitor strains in structural components and displacements around cracks and long gauge sensors are deployed to monitor relative displacements of pillars and columns. The system is proven, and in one such installation has provided data for 14 months continuously without suffering from major problems. Long term monitoring such as this has contributed greatly to the knowledge of historic buildings structural behaviour.

Be aided in the planning of inspections
Assess the effect of interventions and repairs
Provide a form of early warning of the development of cracks
Guarantee safe public access
Availability of strain data to validate numerical structural analysis
Controlled access to data for further analysis

DaMiNS - Data Management and Information System

Use DaMiNS to understand the performance of your infrastructure across your entire network. DaMiNS will enable full data management and visualisation of results from your Monitor Optics continuous monitoring solutions enabling you to classify key measures and derive statistics and historical trends. Configure Key Performance Measures which span across multiple structures to achieve a true corporate scorecard allowing effective review and control of your assets. Set auto alerts to notify key staff of variances 24 by 7. Integrate data results with your internal Quality systems and processes to support ongoing review and investigation to design out failure points.

DaMiNS allows you to immediately analyse results from your Monitor Optics Continuous Monitoring System. Monitor Optics Systems has developed an advanced modelling environment with libraries containing all of the data classes that you will need to visualize your data results. Monitor Optics Systems has applied the logic required for the interpretation of results in order to derive real business value from your data asset. This will enable you to easily detect potential structural failures or assess the effect of structural improvements. You will be able to identify trends and patterns, and to determine the rate of structural deterioration. Use information presented by DaMiNS as an input to the ongoing development of maintenance and access regimen.

Configure key performance indicators (KPI) derived from the monitoring process to manage all of your structural assets from a single screen. Set up thresholds for each KPI to enable auto alert and notification to key staff in the event of results being received out of tolerance. Use the traffic light notification to visually detect structures that might be out of tolerance from your corporate screen. Select specific structural assets and explore the data to determine the root cause of each exception.

Allow your civil engineers to analyse the results obtained from each asset or to view trends across similar structures to compare readings. Set up preferred views to allow immediate access to data results as they are received or on a daily basis.

Use the DaMiNS interface to pass data results into your selected quality management system for further analysis or simply configure DaMiNS to auto alert on out of tolerance assets

Benefits
Increase your ability to validate the predicted residual life models through analysis of your data.
Achieve a corporate view of Key Performance Measures across your whole network of civil structures
Provide exception reporting on pre defined measurement profiles
Configure Auto Alerts for notification on out of tolerance measures
Classify measurement profiles to fit your organisation
Integration with Quality systems and support practices such as Six Sigma
Continuous monitoring with statistics and historical trends

Fibre optic sensing technology

Our bridge monitoring systems are based on advanced fibre Bragg grating (FBG) transducers – optical sensing elements that are incorporated into telecom-grade optical fibre and integrated in a suitable engineering packaging. They convert a measure and strain, displacement, temperature, humidity, for example into a wavelength-encoded optical signal that is output along an optical fibre. An opto-electronic interrogation unit then converts the optical signal into a digital, calibrated output, presented in meaningful units easily interpreted by an engineer. The advantages of optical FBG sensors over traditional sensing technology are many, particularly in the context of long-term structural monitoring. Specifically;

FBG sensors do not suffer from drift and retain an exceptional degree of accuracy over very long periods of time (years). Even the most advanced electrical-based systems using strain gauges or LVDTs for example, simply cannot match this level of performance. Moreover, FBG sensing systems are self-referencing so they can be powered down between acquisitions without losing any reference.


FBG sensors and optical fibre cables are passive (spark-free) devices that are immune to electromagnetic interference and do not require any signal pre-amplification. Thus sensors can be installed at long distances from the interrogation unit without the need to supply electrical power to a sensing location. This greatly simplifies the design and installation of the sensors and cable-network, resulting in a high degree of reliability and cost effectiveness.


Optical FBG sensors exhibit high resolution and large dynamic range. Therefore only a few sensor types can cover a large set of measurements, ranging from the monitoring of crack opening to the relative displacement between main structural supports.

Optical fibre sensors and cable networks are packaged to telecom standards which makes them highly resistant to the elements, allowing them to survive indefinitely in harsh environments.

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