Partnering opportunity

Novel Electromagnetic Sensor for Contaminations in Fog Based on the Laser-induced Charge Effect


Bulgarian research institute has developed a sensor which is capable of measuring the presence of contamination and estimates its relative concentration. The sensor uses liquid layer that allows for removing the layer of fog condensation at the solid surface and the signal variation due to fog dynamics density variation. It is able to measure only the contribution of the fog admixtures to the surface photo-charge effect signal. The institute offers commercial agreement with technical assistance.

Partner sought

The Institute seeks for cooperation with partners in the form of commercial agreement with technical assistance. For all who would like to use these sensors for research in exchange of payment the research organization would offer additional service agreement. The institutes’ offer includes building and optimizing sensors for a particular application.


Atmospheric dispersion is one of the main means for spreading of substances harmful to humans - chemical, biological, radiological and nuclear agents, toxic compounds, etc. These agents are usually dispersed as an aerosol, either in liquid phase, or are mixed with another carrier liquid. Contaminations also do happen as a result of terrorist attacks, wars, industrial accidents, disasters, etc. One of the ways to effectively decontaminate air from these harmful substances is through spreading of fog in the affected environment (indoors and/or outdoors). Fog is in practice an aggregation of microscopic water droplets, spread in the air. Fog sweeps along many different impurities, like small particles, dust, different chemical compounds, etc. and facilitates their condensation on the ground, thus decontaminating the area. The use of this technique, developed in a Bulgarian research institute, requires sensors for continuous monitoring of admixtures in the fog. These detectors should be triggered on when a toxic substance is detected in the environment and triggered off when the concentration of this substance falls below predetermined threshold. The ideal sensor should be small, portable, inexpensive, with simple construction and stable in various conditions. It should also provide easy operation and the possibility for on-line control for both small and large areas. The research team presents a novel sensor for detection of contamination of fog based on the Surface Photo-charge effect. The Surface Photo-charge effect is observed during the interaction of any solid with an electromagnetic field and can be described as the induction of an electric, alternating potential difference in the solid with the same frequency as that the incident field. The Surface Photo-charge effect response is characterized by significant dependence on the specific properties of the irradiated sample. This fact opens vast opportunities for rapid and contactless analysis of solids, liquids, and gasses, and chemical agents dispersed in aerosols. The sensors based on this effect have demonstrated good analytical capabilities and the possibility to be incorporated in portable devices at a relatively low price. In order to transfer this technology to interested organizations the institute offers them a commercial agreement with a technical assistance contract.

Advantages and innovations

When fog is used as decontamination agent, neutralizing substances facilitating decontamination are usually added. These substances can also be harmful to human health. Thus, it is important to perform continuous control of the human exposure to these substances. The most widespread sensors for control of the composition of fog operate by evaluating the permittivity of the medium. One way in which this is done is by cameras that estimate the change in visibility due to the presence of fog or pollutants in the air. A more widespread technique is to use a light source (Ultraviolet and Infrared) and a detector. The light intensity from the source reaching the detector decreases when particles or droplets are present in the air due to the light scattering. The third option is the use of LIDARs to survey the environment. Sometimes humidity sensors are used to help for detection of fog presence. Fog detection has been also performed through radars. These sensors are either limited by a relatively long sampling time or offer portability at a high price and high energy consumption. There is so far no other existing sensor especially dedicated to (on-line) monitoring of contamination in present in fog.

Development stage

Available for demonstration

Intellectual Property Rights (IPR)

Patent(s) applied for but not yet granted

Register your interest

How it works

  • Tell us about yourself
  • We’ll discuss with you
  • We put the right partners in touch

EEN help you find the right partner, rather than you going it alone.

Our role is to review and collate the most suitable submissions, and then send them to the client who posted the opportunity. We consult with you, and the client, to make the process professional and easy.

These are live opportunities. Your registration of interest on the site is just like a professional approach to a business at a networking event. To stand the best chance of success, make your submission really sing. Sell why the client who posted the opportunity should work with you. Excite them. Ask questions. Try and avoid copy and pasting words from elsewhere.

Once the client has chosen their partner, we'll introduce them over email and keep in touch with both parties to see how it's going. Sometimes things progress quickly. Sometimes because of changing priorities for either party, things progress slowly, but you never know - your next big business break could start right here.

?What value does EEN add?
This is your pitch: remember to include your unique selling points (USP) and why someone would want to do business with you
Tell us why you are a good fit for this opportunity, and why you think you're the right people for this partnership
If there's anything additional, or commercially sensitive you'd like to know about this opportunity, please let us know

When you entered your email address above, we emailed you a code to verify you're human and have access to that account.

?What's this?

What next?

To finish up, we just need some extra details about you and your company