IP-L Core and Sample Resistivity/IP Testing System

IP-L SYSTEM
CORE AND SAMPLE RESISTIVITY /IP TESTING SYSTEM
Introduction
IP-L systems has been designed to measure resistivity and
IP parameters on rock samples or drill hole cores. The
knowledge of such physical parameters is useful both to
check the ability of EM, DC resistivity or IP surveys in
detecting a given target, and to improve the quantitative
interpretation of ground geophysical data.
IP-L system consists of three units:
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A sample holder frame
IP-L low power time domain transmitter
ELREC or any time domain IP receiver
Sample Holder Frame
Rock samples have first to be cut in a parallelipidedic
shape (thickness: 15mm) with diamond saw. Then, they
have to be fixed in a 30mm diameter plastic ring
(thickness: 15mm) with an araldite resin warmed in a
vacuum oven at 60°C.
After they have been prepared, samples have to be placed
into a water filled container during several days so that
water can fill the pores of the rock.
By connecting the AB terminals of the IP-L transmitter to
the external plugs of the sample holder frame and the MN
terminals of the ELREC receiver to the internal plugs, all
the current supplied by the transmitter will flow across the
rock sample as long as the resin is non porous.
1
Terraplus Inc.
52 West Beaver Cr. Rd. #12, Richmond Hill, ON. Canada L4B 1L9
Tel: 905-764-5505
Fax: 905-764-8093
Email: sales@terraplus.ca
Website: www.terraplus.ca
IP-L TRANSMITTER
To obtain both Resistivity and IP measurements on rock samples or
drill hole samples, the next steps have to be followed:
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Connect the AB output plug of the IP-L Transmitter to the
external plug of the sample holder
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Select the pulse duration (1 or 2 seconds)
Select the intensity of the regulated current (1,10 or 100 µA)
Use the IP receiver to carry out the measurement (voltage and
chargeability)
ELREC RECEIVER
To obtain Resistivity/IP Measurements, you can use either the
ELREC 6 or ELREC Pro Receiver.
For induced Polarization parameters, sample chargeability
values can be read directly on the display of the receiver.
For resistivity measurements, the following computations have
to be carried out:
Let L, 1, e be the three dimensions of the sample
(e= thickness = 15mm), Vp the voltage by the receiver, I the
intensity of current provided by the transmitter, and RHO the
resistivity of the rock
The resistance of the rock sample is:
R=RHO.e/L.1 = VP/1
Hence:
RHO = (Vp/1) (L.1/e)
L, 1, e
VP
I
RHO
in m
in mV
in mA
in ohm.m
For example:
L = 16mm
Vp = 2311 mV
1 = 18mm
I = 0.01 mA
e = 15mm
RHO = 4440 ohm.m
2
Terraplus Inc.
52 West Beaver Cr. Rd. #12, Richmond Hill, ON. Canada L4B 1L9
Tel: 905-764-5505
Fax: 905-764-8093
Email: sales@terraplus.ca
Website: www.terraplus.ca
SPECIFICATIONS
Sample Holder Specifications
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Dimensions: 12 x 24 x 16 cm (5 x 9 x 6 in)
Weight: 1.5 kg (3 lb)
IP-L Transmitter Specifications:
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Maximum output voltage: 10V
Symmetrical time domain waveform (ON+,OFF, ON-,OFF)
Pulse duration: 1s or 2s
Output current” 1, 10 or 100 µA
Current regulation ±1%
Power supply: four 1.5V, A size dry cells
Operating temperature range: 0°C to +70°C
Dimensions: 16 x 22 x 10 cm (6 x 9 x 4 in)
Weight: 0.5 kg (1 lb)
ELREC Pro Receiver Specifications *
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Input voltage: Max. for channel 1: 15 V
Max. for the sum from channel 2 to channel 10: 15 V
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Protection: up to 800V
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Voltage measurement: Accuracy: 0.2 % typical
Resolution: 1 μV
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Chargeability measurement: Accuracy: 0.6 % typical
Induced Polarization (chargeability) measured over to 20 automatic or user defined windows
Input impedance: 100 MΩ
Signal waveform: Time domain (ON+,OFF,ON-,OFF) with a pulse duration of 500 ms - 1 s - 2 s - 4 s - 8 s
Automatic synchronization and re-synchronization process on primary voltage signals
Computation of apparent resistivity, average chargeability and standard deviation
Noise reduction: automatic stacking number in relation with a given standard deviation value
SP compensation through automatic linear drift correction
50 to 60Hz power line rejection
Battery test
* You can get more information on our ELREC IP Receivers on the following links:
Elrec6.pdf , Elrec_pro.pdf
3
Terraplus Inc.
52 West Beaver Cr. Rd. #12, Richmond Hill, ON. Canada L4B 1L9
Tel: 905-764-5505
Fax: 905-764-8093
Email: sales@terraplus.ca
Website: www.terraplus.ca
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