Dualem Inc.
Dualem sells electromagnetic geophysical instruments for conductivity surveys. A DUALEM sensor (Sensor) incorporates one-, two- or three-sets of the patented DUALEM dual-geometry array. Each dual-geometry array simultaneously measures both electrical conductivity and magnetic susceptibility to two distinct and defined depths. Multiple sets of arrays enable the estimation of the distribution of these properties in a layered earth. DUALEM products are made in Canada and ship worldwide.
Company details
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- Business Type:
- Manufacturer
- Industry Type:
- Geotechnical
- Market Focus:
- Globally (various continents)
DUALEM Products
A Sensor has an internal logger that records electromagnetic (EM) responses, grid coordinates, time, temperature, power voltage, X-Y-Z components of acceleration and the ambient magnetic field, pitch and roll. Most Sensors have the option for an internal GPS receiver; if there is a GPS fix for a Sensor with GPS, its internal logger also records NMEA $GPGGA sentences.
Sensors operate by EM induction into the earth (i.e. not by galvanic contact with the ground). This enables surveying at moderate speed over rough, non-conductive terrain, such as bedrock, pavement, stones, desiccated soil, dense vegetation and ice.
Sensors are calibrated precisely at the factory using a patented technique, eliminating the limitations of ad hoc calibrations in the field. Precise calibration, base-level stability, high sensitivity and advanced digital signal processing give the Sensors unmatched accuracy.
Sensors can be used with control-, positioning- and support-systems supplied by the user. LED lights indicate the status of power and communication. Sensors receive text commands and provide text output in NMEA-standard (CSV) sentences (or, alternatively, 4-line groups) through their Bluetooth and RS-232 ports. A variety of third-party devices and software can log DUALEM text and integrate it with positions from external GPS receivers.
Sensors are often mounted on a sled or cart, and can be deployed in a watertight housing. A Sensor comes with a data/power cable and manual in a shipping case. Options are
- a Controller with GPS and;
- a Harness with data/power module and rectangular feet
The handheld Controller communicates with its Sensor by Bluetooth and with the internet by Wi-Fi (etc., as provided by the user). It displays data, GPS position and logs positioned data. It has a weatherproof cover, and can receive supplementary power through its micro-USB port.
The Harness facilitates carrying the Sensor for walking-speed surveys, and its rectangular feet help with alignment in station-by-station surveys. Its data/power module has a 9-socket connector for RS-232 communication and a holder for 8-AA batteries to power the Sensor.
A DUALEM instrument (e.g. the DUALEM-4) combines a Sensor (e.g. the DUALEM-4S), a Controller and a Harness to form a package convenient for hand-carried surveys.
