Seismic Detector FS-Reflexion

Tunnel and Cavity Detection

Seismic measurement is a geophysical measurement method which is mostly used to detect and explore underground cavities. During the measurement procedure vibrations will be generated and transmitted into the ground. Relexions, travel time and vibrations will be recorded. According to the soil conditions the measured data gives clues to hidden objects.

FS-Reflexion is a geophysical measuring instrument to locate subterranean voids like caves, bunkers, tunnels or basement vaults. FS-Reflexion works with a seismic vibration system. A transmitter generates vibrations penetrating the ground. Depending on the type of soil they will be transmitted or damped. If a void exists it will start to resonate in its own frequency and can be detected by a seismic vibration transducer. FS-Reflexion can be used all around the world, no matter if there is stony ground, loam or clay soil, in the mountains or in flat country.

FS-Reflexion includes different operating modes to record and analyse data:

• Check Mode to recognize seismic disturbances
• Scan Mode to record measurement values for a graphical representation
• Frequency-energy-graph to analyse seismic activities
• Data transfer to computer for graphical representation in 3D

The recorded measurement values can be analysed via the frequency-energy-graph. In this diagram a high amplitude at specific frequencies indicates existing subterranean voids. Additionally it is possible to summarize all measurement values to a 3D representation, so that they can be analysed in the professional Visualizer 3D software. In that way voids cannot only be represented visually, but also their size can be determined.