In the middle of the experiment somebody knocks on the tank, leading to higher sand compression and the removal of some particles that stuck to the sensors. The next image shows an outdoor experiment where the ASM is installed in shallow water. The scaling is different here, the high resolution time axis is from front to back, one line is 10 seconds. The sensor axis is from right to left, again one line is one sensor. The instrument is in the sand on the left and in the air on the right.
Sensors have a higher reflection in air due to surface effects of the lenses.
The variance of the reflection is amplified here and again displayed in red. After a little while the movement calms down and resedimentation leads to a lower material density in the water. The information presented here is only a small fraction of the possibilities the ASM and the ASMA program offer. For further information please contact me or my partners at Argus .