Page 1 - E017-0 Vibracoax.PDF

THERMOCOAX
The piezo-electric sensor VIBRACOAX
n Small dimensions,
n Strong construction
and environment pro-
tected,
n Long life,
n Self-powered,
n Electrically screened -
will not produce inter-
ference signals and is
unaffected by external
electrical noise,
n Simple to install both in
bare or encapsulated
form,
n Will work in all ambient
conditions and tem-
peratures ranging
from -20°C (-4°F) up to
+70°C (+158°) without
alteration of the output
signal.
VIBRACOAX® cable is a min-
eral insulated coaxial cable
with the sheath made of a
copper tube, which contains
a polarized compressed pie-
zoelectric ceramic powder
with a copper core running
through the center.
It is manufactured using
swaging and drawing tech-
niques. At the end of the
drawing process, the piezo-
electric ceramic particles
have to be polarized in order
that all the indiv idual signals,
originating in each single
Data subject to alteration without notice
crystal builds up to a measur-
core and the sheath of the
cable. This signal is then
measured by an adapted
electronic circuit.
Sales : 40 Bd Henri Sellier - F 92156 SURESNES Cedex - Tel.: +33 (0)1 41 38 80 50 - Fax :+33 (0)1 41 38 80 58
http : //www.thermocoax.com
Head Office : Planquivon - F 61430 ATHIS DE L’ORNE France - THERMOCOAX S.A.S. au capital de 457 500 € –
RCS CONDE s/NOIREAU B 323 459 925 - N° TVA / VAT Nr : CEE FR 32 323 459 92
from vision to reality
P P
P (Pressure)(Pressure)(Pressure)
VIBRACOAX L L L
VIBRACOAX
VIBRACOAX
(l & L footprint)
(l & L footprint)
(l & L footprint)
W W W W
(Weight))))
(Weight
(Weight
(Weight
ò ò ò?Q?Q?Q
(Charges)
(Charges)
(Charges)
t t t
(time)
(time)
l l l l (time)
The piezo-electric materials is Road traffic
also pyroelectric, i.e. it gen-
erates electrical charges This sensor can be used in
when temperature varies. virtually any type of road-
way, on its own or combined
In general, the mechanical with any other kind of detec-
and thermal time constants
tor.
of the VIBRACOAX® are very
different and both phenome- When associated with rele-
vant electronic device and
non cannot be mixed up. equipment, this sensor offers
Since the materials used for many applications in the
the VIBRACOAX® cable are open road and urban traffic
metallic and ceramic, they control as well as for the pro-
can withstand extremely ag- tection of bridges and car-
gressive media for a long time. riageways by :
Principle of operation
• Vehicle classification by
counting and weighing in-
In the field of traffic control dividual axles,
and analysis, particularly for
weigh-in-motion, the use of a • Gauging width of vehicles,
VIBRACOAX® allows to • Load distribution,
measure the stresses gener-
ated by the vehicle axles • Vehicle distribution,
onto the road.
able signal between the a VIBRACOAX® sensor, it cre- • Weigh-In-Motion,
• Vehicle discrimination,
When a wheel is passing over
a
variation
ates
pressure
• Speed measurement,
which is transformed into elec-
• Monitoring traffic volume
trical charges (Q) by the ce-
per carriageway.
ramic piezo-electric material.
E017-0
- e-mail: info@thermocoax.fr