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Implementation of a new marking out system for buried pipes based on the detection of acoustically stimulated piezoelectric markers (PEM)

Objective


At the end of the project, having developed the PEM markers, the possibilities of acoustic emission and the receiver, the developed theories presented by the means of laboratory tests showed their limitation on the ground.

Indeed, we forecasted to use the answering frequency of the electric piezo and the liberated energy in order to convert it into electro magnetically energy by the mean of an adapted antenna.

The experience and the ground tests (all types of grounds) proved that following the environment, the perturbations, the piezo specifications… the obtained frequencies were submitted to important variations.

During those 24 months of study, we tested the feasibility of a PIEZO ELECTRIQUE component used as an energy source in order to power electromagnetic emission electronics.

Manipulations in labs and tests in the field clearly demonstrated the impossibility to merely use the electric Piezo on its resonance frequency as a frequency source (the frequency varying in great proportions) in accordance with the environment.

Thus we introduced, in the PEM marker emission chain, an electronic as a “loading pump” and an oscillator accurate in frequency. An antenna constituted of a coil enables a capacity of emission of about 1m50.

This demonstrated the technical feasibility we expected and, unfortunately, the different disadvantages of the PEM device :
- On the one hand, for the users the mechanic shock excitation is very constraining. More over, the markers tests buried under a bitumen coating show a huge diminution of the shock wave. This is due to the impedance ruptures in a heterogeneous soil. The shock wave transmitted by the mass does not arrive.
On the other hand, as we indicated in the Mid-Term report, the mass-manufacturing of the PEM markers significantly changed.
The manufacturing price prevision has gone up from 0.5€ to 2.5€ for a basic marker. This is an important obstacle for the targeted market.
We thus can say that his programme will not lead to a commercial success.

Funding Scheme

CRS - Cooperative research contracts

Coordinator

MADE
Address
Chemin Paul Madon, Espace Frioul
83160 La Valette Du Var
France

Participants (9)

BLUE PANTHER SRO
Czechia
Address
Na Schudkach 10
14300 Praha 4
CESIGMA
France
Address
Forum Aurelia - Route Du Val
93170 Brignoles
GAZ DE FRANCE
France
Address
23,Avenue Du Président Wilson 361
93211 La Plaine Saint-denis
MAQUINAS ELECTROMECANICAS SEGURIDAD
Spain
Address
Calle A Interior, Nave 30 Bis, Poligono Industrial
28230 Las Rozas De Madrid
OMD FAST MOD
Romania
Address
Street Timisorii 57
1800 Lucoj Jud Timis
SOCABELEC
Belgium
Address
Rue Emile Vandervelde 56
5190 Jemappe Sur Sambre
TECSYS+
France
Address
Quartier De Paris - Route Du Val
83170 Brignoles
TEMPTEC
Portugal
Address
N°86, 2° Dt°, Cc Da Boa Hora
1300-096 Lisboa
UNIVERSITÉ DE TOULON ET DU VAR
France
Address
Bètiment R, Avenue De L'université
83130 La Garde (Var)