Complex electromagnetic impedance as a base for continuous monitoring of liquids


Continuous monitoring of liquid properties is a topical problem in many branches of modern science and industry. Oceanology, meteorology, chemical and food industry, ecology, medicine and agriculture are just some of the areas where this technology applies.

DVM has been performing R&D in this field for well over 10 years. Our main goal is finding and describing multiple correlations between physical – chemical parameters of a specific type of liquid and its electrodynamic characteristics.

As a base electrodynamic parameter of liquid we regularly use its Complex Electromagnetic Impedance (CEI) which, compared with chemical parameters, can be measured in seconds. Unfortunately, existing CEI measuring systems are in many cases not accurate enough and usually cannot be used as a base of reliable liquid monitoring technology. This has to do with the following inaccuracies of traditional CEI measurement methods:

  • Inaccurate measuring constants according to basic standards;
  • Low accuracy of conductivity measurements due to electrode errors;
  • Low accuracy of parallel temperature measurements;
  • Low selective action accuracy of measurement parameters.

Since every liquid posesses specific electrodynamic properties, our research and development is always directed at specific liquid monitoring tasks. Our research aims to create highest precision measuring technology and includes the following steps:

  • Detailed Electrodynamic research of concrete liquid in wide frequency range
  • Creation of unique electrodynamic matrix of liquid parameters, based on specific monitoring task
  • Development of special, often unique, CEI measuring cell
  • Development of the monitoring measurements algorithm and the necessary software
  • Development of special noise immune measuring hardware
  • Creation of special self-adjusted liquid monitoring system, realizing self-contained, reliable measurements with the world highest accuracy.

In several of our research projects we were able to reach less than (0,001-0,002)%  liquid CEI measurements uncertainty.

Some of the possible application areas of our liquid monitoring technology include

  • Oceanology: monitoring salinity and temperature of oceanic water (so called STD-systems) to be used in fishery and scientific investigations.
  • Meteorology: monitoring parameters of oceanic and sea water for weather forecasting, computing global and local climate models.
  • Chemical industry: monitoring of liquid component’s concentration within technological process.
  • Food industry: monitoring of food quality (for example, sugar purity).
  • Ecology:  monitoring of water purity ( for example, industrial wastewater)
  • Medicine: Testing and diagnosis in urology, plasma and blood analysis (for example, dialysis testers, testing of the results in intracranial and minimal invasive surgeries.
  • Pharmacology: Monitoring water purity and solution concentration.
  • Thermo- and atomic power stations. Monitoring power steam-boiling water purity.
  • Water supplies: Monitoring water quality.
  • Agriculture: Monitoring irrigation water salinity to avoid soil pickling; Testing products quality.

Reliable high accuracy liquid monitoring is very important and can lead to significant scientific, industrial and ecological improvements in these and many other areas.

DVM is constantly looking for new applications of this technology and cooperation partners in this extremely interesting and promising field of precision electrodynamic liquid monitoring.