This instrument was primarily developed for high resolution measurements at the bottom of the seabed (ocean/river locations). It records the reflections, the dynamic parameters and the suspended sediment concentrations as well that are created in the measuring plane by solid particles moving in a multiphase current. It provides an independent contribution to the complex questions which arise from the context of transport of solids in the zones between the bottom, the fluid mud layer and the main body of water.
The instrument operates with backscatter infrared sensors embedded in a titanium body. The sensors are placed on an active board at a distance of 10 mm. This means that 100 sensors are mounted per meter.
Each sensor consists of an infrared transmitter and detector. The sample to be taken has a volume of approx. 10 cm³ at a distance up to 100 mm in front of the sensor.
The instrument contains three additional sensors.
Activation and power supply for the sensors as well as for the transmission of the signals are controlled by a battery powered central unit sealed-in the head of the instrument. It consists of a microprocessor, a data memory, the additional sensors and the energy supply.
The energy consumption of the instrument is very low ( < 6 mAs). That means one 9V block alkaline battery (lithium will double duration time) will provide the necessary energy for 2 months, assuming a sample rate of 10 measurements every 5 minutes, or the energy for a standby status of approx. 6 months. The capacity of 8 Mb will provide a measuring time of approx. 8 weeks in total, without weakening the battery at the sated rates above.
The microprocessor carries out all of the tasks necessary for control. Incoming data is processed by the microprocessor and stored in memory.
The ASMA 4.xx software runs on modern PC systems.
!The most common cause of errors in ASM-OBS data is a failed calibration!
For a proper calibration it is absolutely necessary to keep particles in homogenious suspension while running the calibration procedure. The design above had been created after checking with different particle sizes in the tank. A download drawing is available.
ARGUS will pre-calibrate ASM-IV instruments if requested. In this case the user has to provide sediments from the local environment.
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