Electromagnetic Geonics EM-38 B with real-time conductivity and in-phase logging.
For any one measurement, the standard EM38 provides measurements of either quad-phase (conductivity) or in-phase (magnetic susceptibility) component data, as selected by the operator. Comparatively, the EM38B provides simultaneous measurement of both phase components, at all times (just like an EM31). For surveys which include measurement of both components - common for archaeological investigations - the EM38B significantly reduces the amount of time required.
Designed for relatively shallow applications - specifically within the agricultural root zone - the EM38 provides measurement of ground conductivity (quad-phase) and magnetic susceptibility (in-phase) within two effective depth ranges: 1.5 m in the vertical dipole mode (shown above); and 0.75 m in the horizontal dipole mode. Based on the same induction principle as the EM31-MK2, the EM38 can survey large areas quickly, without any requirement for ground-to-instrument contact.
For agricultural applications, measurement of ground conductivity is particularly useful for the mapping of variations in important soil properties such as salt and soil moisture content.
The EM38 has proven to be useful for many near-surface applications, including archaeology, wherein use can also be made of the information available in the measurement of soil magnetic susceptibility.
Very lightweight and only one metre long, the EM38 provides rapid surveys with excellent lateral resolution. Measurement is generally made by placing the instrument on the ground and recording the indicated reading; digital meters are located on the top and side of the EM38 for the horizontal and vertical dipole measurements, respectively either a continuous or stationary measurements can be obtained from a standing position using the optional extender arm (shown above) with cable connection to a data acquisition system. In this mode of operation, several thousand data points can easily be obtained in one hour.
For larger-area surveys, the EM38 can be easily mounted on a platform and towed behind a vehicle. Real-time (RT) data acquisition, with direct connection to computer-based acquisition systems, is available with an optional modification.
Instrument: 106x15x3.6 cm
Shipping: 117x19x13 cm
Instrument: 3 kg
Shipping: 10 kg
46 X 5 X 7 inches
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