Our measurement technology

 

We employ laser-distance sensors for the permanent structure monitoring. A laser measuring section consists of an active laser-distance sensor and a passive metering target. The lasers are mounted on a fixed point such as for example an abutment, the metering targets are typically positioned halfway on the superstructure's span width.

 

The dynamic behaviour pattern of structures is recorded permanently and highly accurately at the metering points. External influences are recognised as such and compensated.

 

There are no moving parts. The measuring sections do not age and are designed for a useful life of at least ten years.

 

Here an overview of the advantages of the laser-measuring methods:

 

 

BMG-Laser
BMG-Laser

 

  • permanent, highly accurate measurements
  • wear-free measuring sections
  • manageable data volumes
  • fast interpretation options of the measured values 

  

Our laser-based measuring method was developed by Lucks Technologies GmbH and is protected by patent law.

 

 

Application examples for structure monitoring

The measuring system records and monitors the global load behaviour patterns of supporting structures. The measuring principle is the dynamic deflection measurement between the metering points across a distance from 1 to 100 metres. The displacements are measured within a range of a tenth of a millimetre.

 

 

Principle structure of the measuring sections:

 

 

1 ... 4    Laser Target (passiev)

 

M          CPU (aktive)

 

The graphic shows the deformation behaviour pattern of one element in a time frame of three minutes:

 

 

Every crossing of a vehicle can be detected as a deflection and so as a metered value.

  • Metered values < 0.5mm   automobile traffic with overlap of the natural oscillation
  • Metered values > 0.5mm   Transporters and trucks

 

Damage simulation

The lowering of the zero positions after the breakage of a tendon is exaggerated in the adjacent damage simulation. Normally the rate of the damage progress is far slower and occurs more gradually.

 

 

The monitoring continuously analyses the ductility of the superstructures. Changes of the zero positions are recognised at an early stage. This means that damage can be identified and analysed even before cracks appear in the concrete.

 

This is the result of component tests at the University of Luxembourg, see Research and Development.

 

 

Mobile measurements

In addition to the stationary application, we also offer mobile measurements procedures. With our mobile measuring system, we can, for example, record the deformations under load conditions at different metering points and various speeds.

 

 

Distinctive features of the mobile measuring system:

 

Example of a mobile laser system
Example of a mobile laser system

 

 

  • Autarchic power supply
  • Metering results available on-site
  • Simple integration of further sensors, such as DMS, inductive position sensors, oscillation or inclination sensors
  • Chronological synchronised data recording

 

 

Our measuring concept is just as unique as the bridges we monitor: We can also employ several systems in parallel for larger projects. In this case, all measuring systems are chronologically synchronised (the data are assigned a uniform time stamp). Additional sensors can be employed over an interface as required.

 

Individual solutions are always possible – just ask us!