V i a P a s t r e n g o 9 , 2 4 0 6 8 S e r i a t e ( B G ) T e l . + 3 9 0 3 5 4 5 2 0 0 7 5

W e b s i t e : w w w . s o l g e o . e u e - m a i l : i n f o @ s o l g e o . i t

DDH-Geo

Double Down-Hole Geophone

B r o c h u r e _ D D H - G E O _ 8 - 2 4 . d o c x

Rugged, strong and easy to use

Connection for double geophone system

Pneumatic locking system

Orientated aluminum poles system

Suitable for Geode acquisition unit or MiniRec By Solgeo

V i a P a s t r e n g o 9 , 2 4 0 6 8 S e r i a t e ( B G ) T e l . + 3 9 0 3 5 4 5 2 0 0 7 5

W e b s i t e : w w w . s o l g e o . e u e - m a i l : i n f o @ s o l g e o . i t

DDH-Geo

Double Down-Hole Geophone

TECHNICALFEATURES

SYSTEM

Diameter 60mm Lenght 290mm Weigth 3.5 kg Waterproof 120m Max air pressure 15bar Air pipe connection 6mm Max piston range 21.5mm Connector Souriau

MECHANICAL FEATURES Case Aluminium Oriented poles Aluminium Poles lenght 1.5m

ELECTRONIC FEATURES Geophone GS20DH 28Hz Damping 0.7 Sensitivity 26.7 v/m/s

DDH-Geo: the new triaxial borehole geophone, designed to seismic applications as Down-

Hole survey. Provided with a fast-locking system with oriented aluminum poles, it allows to

perform double setting configuration aimed to differential travel time processing. It also

guarantees an high accuracy and fulfilling of international standard, ASTM D7400-08

DDH-Geo: il nuovo geofono tridirezionale da foro, pensato per applicazioni sismiche tipo Down-

Hole. Dotato di aggancio rapido per l’utilizzo di aste in alluminio orientabili, permette di adottare una

configurazione doppia per un elaborazione differenziale dei tempi di arrivo, garantendo così un estrema

accuratezza delle misure e il soddisfacimento delle normative vigenti, ASTM D7400-08

Schematic geometry of a Down-

Hole survey according to ASTM

D7400-08 (right) and DDH-Geo

configuration (above)

Set of aluminum poles to oriented properly

geophones inside the borehole

Set of stabilizers with different length for

geophone fixing along borehole wall

Planar view of DDH-Geo inside a 4” pipe and 3” pipe, using

2 different sets of stabilizers

4” Pipe – 101mm internal

3” Pipe – 76mm internal