ABEM Terrameter SAS 1000 / SAS 4000
- 99 -
14.7
POLDIP4L + POLDIP4S: 4-CHANNEL POLE-DIPOLE ARRAY
CVES WITH 4 ELECTRODE CABLES
+ REMOTE ELECTRODE
This combination of protocol files is intended for dipole-dipole array CVES roll-along
measurements, and has been found very useful for a variety of applications. It offers a
resolution superior to the commonly used Wenner array, and thanks to 4-channel measuring
the increased data density does not become costly in terms of increased time required in the
field. It has a larger depth penetration, but requires a remote electrode that may be
problematic in practice. Due to the character of the array some duplicate data points can occur
when doing roll-along. Note that it is important to select the protocol files in the correct order,
starting with the long layout (POLDIP4L) before selecting the protocol for short layout
(POLDIP4S). It gives a dense near-surface cover, and a slightly sparser measurement pattern
at long electrode spacings. POLDIP4S is designed to supplement POLDIP4L for the shortest
electrode spacings only.
Array
type
Protocol
name
Address
file
No of
data
ORG
No of
data
UP
No of
data
DWN
Total data
for
one
layout
16
Pole-
dipole
POLDIP4L LONG
584
292
-
1651
POLDIP4S SHORT
288
284
-
16
Total number of data points for a four-cable layout using the procedure described in this manual.
Figure 31. Data cover of POLDIP4L and POLDIP4S for roll-along with three full stations
(minimum electrode spacing 5 metres).
