ALMAZ Marine is the most modern system in the World for performing continuous aquatic sounding on DC or recording EM processes with 72-electrode towing array. A unique 3 kW generator allows using current up to 10 A, and when using an external DC source, 50 A current switching is available (optional). The built-in switchbox is designed to select one of three available array types. This approach, together with synchronous data recording on 32 channels, provides the highest possible resolution and depth of study achieveble with electrical tomography method – up to ~100-150 m (array with 5 m electrode spacing) both in fresh and marine water with a bottom depth of up to a few tens of meters.

Receivers
ALMAZ Marine has 32 precision channels with constant self-potential (SP) compensation. Another two channels are reserved for recording of current and signal voltage measurement. All that raw data can be recorded with sampling rate up to 3,600 Hz (7,200 Hz on request) per channel for further processing. Each receiver is isolated and has a filter. ALMAZ receiver is among the best on the market and provides minimal noise and good phase characteristics stability.

Transmitter
We have developed a 3 000 W power transmitter designed for aquatic applications. It works with currents up to 10 A and voltages up to 300 V (up to 600 V peak-to-peak) using a meander or paused meander waveform. These parameters provide measurable signal on all channels with standard 5-meter electrode spacing streamers, even in the marine area. ALMAZ Marine can also work with an external transmitter with continuous current recording in the line.

Arrays and streamers
ALMAZ Marine supports two dipole-dipole and one gradient array. The first type is intended to get the best resolution and depth in freshwater areas or high resistivity water. Gradient array provides a significantly higher signal level at the receiver dipoles, so it is preferable in salty or heavily polluted (with resistivity starting from 0.2 Ohm∙m) water areas. Both arrays are designed to provide optimal data coverage of the pseudosection.

ALMAZ Marine is supplied with 72-electrode streamer. The standard spacing between the electrodes along the streamer is 2 – 5 meters. Transmitter electrodes are located outside the receiving streamer, and their spacing is easily adjustable. Thus, the length of an array varies from 146 to >365 m, which allows to estimate the depth of the survey in average geological conditions from 35 to 150 m, respectively.

Streamer for near-surface towing has floats, that allow to control immersion depth while keeping the streamer visible while towing. The floats can be detached, so that the streamer is laid on the bottom, connected to an optional switchbox, and bottom ERT observations can be performed. Deep-towed streamers with built-in pressure sensors, magnetic compasses and INS are also available, which allows to calculate array positioning precisely. Bottom towing is another option which increases the resolution and depth of surveys, while maintaining a high speed of surveying.

Optional powerful current switches
For electromagnetic soundings in salt waters, currents of several hundreds od Amperes are required. If your project requres such powerful switchbox, contact us and we will be happy to assist.

Optional ERT switchbox for bottom observations
The towed cable included in the delivery set can be used for bottom detailed observations with electrode switching using CommDD2.

Optional GNSS receiver
When surveying with a towed streamer, it is crucial to record coordinates in real time using GNSS receivers. We supply sealed GNSS receivers that can be located on the vessel and on the end buoy.

Reliability and warranty
Our R&D specialists have extensive experience in performing geophysical surveys. We are well aware that such equipment must be reliable, and the service must be fast and comfortable. We give 3 years warranty on ALMAZ Marine systems, and our technical support team will promptly answer any of your questions. If you are still working with outdated equipment – take advantage of our trade-in offer and protect your projects from potential problems.

On request it is possible to customize ALMAZ Marine unit for a submersible version in a sealed container for installation on controlled underwater vehicles or with other additional features. In order to properly formulate technical specs of your system, please contact us in any way indicated on the website.