DOREL ZUGRAVESCU*, RAUL DOROBANTU*, MANFRED BONATZ**, NEACSU PUSCASU***
* Centrul de Fizica Pamantului si Seismologie, Laboratorul de Geodinamica si Analiza Numerica, Bucuresti
**Institut für Theoretische Geodäsie der Universität Bohn, Deutschland
***I.F.L.G.S., Bucuresti
CAPACITIVE TRANSDUCER BAROGRAPH (CTB)
(Abstract)
CTB is materialized in a tight capsule, sensitive to the changes of the air
pressure, its axial distortion being taken over by a differential capacitive
transducer. The information furnished by it, as a variable voltage, can be
recorded either direct analogically, or stored on a high density support, after
its digitization.
OF small sizes, with a negligible caloric energy dissipation, CTB can be utilized
in underground enclosures where the geodynamic sensors work.
CTB has a good stability (drift < 0.01 mbr/hour) and high sensitivity (1 V/bar
for a signal/noise ratio > 50 dB). CTB is built of Romanian-made components.