Measuring Tank


	Contents:
	Overview
	Measuring Tank
	MIMO Systems
	Speech and Data Communication
	Underwater Channel Simulation
	SONAR Sisters

For the calibration and functional testing of our underwater equipment, a dedicated measuring tank with dimensions of approximately 5 m × 5 m × 5 m is available. The tank is equipped with special absorbers on the side walls and the bottom to minimize reflections and interferences during acoustic measurements. REGUPOL playfix FX mats are used as damping material. These mats are made of rubber granulate and may influence the pH value and chlorine content of the water under certain conditions. To ensure consistent water quality and to protect the sensors in use, we maintain controlled water treatment. The pH value should ideally be in the range of 7.2 to 7.6 to enable effective yet material-friendly chlorination. The free chlorine concentration is maintained between 0.3 mg/L and 0.6 mg/L, while the total chlorine content should not exceed 1.0 mg/L. To adjust the pH value, we use standard pH-minus or pH-plus granules. If deviations occur due to the mats or other influences, fresh water is added to the tank as an additional measure to restore the water parameters to the desired range.

Responsabilities

Who	What
Lukas Schirmer	Water measurements
Finn Röhrdanz	Pool cleaning

Water Measurements - PH Value

Water Measurements - Free Chlorin Value

Water Measurements - Total Chlorin Value

Actions - Planned and Taken

Date	Contents	Success or Failure
08.08.2025	Pool cleaning with robot	Done (No real cleaning effect).
07.07.2025	Pool cleaning with robot	Done (Finn 10.07.2025).
16.06.2025	Pool cleaning with robot	Done (Finn 17.06.2025)! Robot did not collect much/any dirt. Problems occured at screws, nevertheless beeing able to complete cleaning.
01.06.2025	Freshwater inlet via local hose for about 2 days	Water was much clearer compared to before

Visit of the Hans Böckler Foundation

The Hans Böckler Foundation offers students not only financial support, but also a wide range of seminars. We had the pleasure of taking part in an exciting seminar on the topic of ‘Data channels in the seabed - insights into the underwater infrastructure of the future’. We spent one day at the Faculty of Engineering at Kiel University. We were given presentations on various topics. Such as the geology of the seabed and the submarine cable incident between Finland and Estonia.

We were particularly impressed by the opportunity to take a look behind the scenes and experience the work of the students and researchers up close. We were allowed to visit the clean room and the special ‘paddling pool’ where experiments are tested directly in water. We were deeply impressed by the university and its diverse research opportunities. Thank you very much for your hospitality and the exciting insights!