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QL40-SIP – Spectral Induced Polarization


Mount Sopris Instrument Company, together with Ontash & Ermac and Rutgers University, are developing a new borehole probe based on Spectral Induced Polarization (SIP) technology. This SIP probe is directly relevant for subsurface investigations in following fields:



The SIP method is one of the most robust and reliable methods for the indirect determination of lithological / physical properties of earth media such as:


Operating Conditions

Borehole Fluid
[X] Water
[X] Mud
[_] Dry

[X] Uncased
[_] PVC Borehole
[_] Steel

[_] Required
[X] Not Necessary


Features & Benefits


Specifications – Metric/Imperial

Specification Metric Imperial
Diameter 50.8 mm 2″
Length 330.2 cm 130″
Max. Temp. 70ºC 158ºF


SIP Measurement Theory of Operation

The Spectral Induced Polarization response (also known as Complex Resistivity) is measured by applying sine wave currents in the frequency range between 1 mHz and 10 kHz. Impedance |Z| and phase ϕ are determined by correlating induced voltage U and stimulus current I.



Development Team


For over 60 years, Mount Sopris Instruments has delivered innovative borehole logging solutions to drillers, miners, engineers and researchers in over 120 countries. With an extensive product range and industry-leading customer support, Mount Sopris is dedicated pushing the boundaries of science to improve productivity and data integrity.


Advanced Logic Technology is a software and hardware development company bringing innovative solutions to the geoscience industry since 1993, including best-in-class log composite software, WellCAD, and industry-leading imaging probes.


Ontash & Ermac (O&E) is a leading developer and supplier of spectral induced polarization (SIP) equipment for use in laboratory, surface, and borehole applications. Since 1996, O&E has developed sophisticated electronics systems used in consumer, building systems, defense, medical, telecommunications and industrial automation systems.



Led by Dr. Lee Slater, Rutgers University has been a leader in innovative research on the SIP method since the late 1990’s. With hundreds of peer reviewed publications, Rutgers is on the forefront of advancing SIP understanding for hydrogeological and environmental problems.


The National Science Foundation (NSF) is funding the initial development work for the SIP probe. The NSF exists to support scientific research to create knowledge that transforms the future.



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