**I****mplementation of innovative methods of Electrical Impedance Tomography to examine the flood embankment**

View presentation: sa.netrix.com.pl/monitoring-walow

The aim of the project is to develop a modern system for testing and monitoring the flood embankment. The proposed solution is an innovative product, which is an innovative and modern way unprecedented in such a form today due to the applied technologies and the complexity and diversity of reconstruction algorithms (testing property objects).

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**Main elements of the project:**

- performing new methods in Electrical Impedance Tomography to obtain electrical conductivity distribution,
- creating innovative methods to checking state of flood embankment system,
- creating new algorithms for on-line monitoring,
- constructing prototype of the system.

The Electrical Impedance Tomography (EIT) is a non-destructive imaging technique, which has various applications. Efficient algorithms for solving forward and inverse problem have to be developed in order to use this approach for practical tasks. Moreover, it is necessity to improve performance of selected numerical methods. The typical problem in EIT requires the identification of the unknown internal area from near-boundary measurements of the electrical potential.

The architecture of the flood embankment system (fig. 1):

- sensors,
- data acquisition,
- data,
- management system
- algorithms of image reconstruction,
- analysis,
- visualisation.

*Fig.** 1. The architecture of the flood embankment system*

*Figure 2. The examples of embankment’s damage*

*Figure 3. The distribution of elements on the edge of the flood embankment*

The proposed algorithm is iterative method, structured as follows:

- from the level set function at initial time, find necessary interface information,
- use the finite element method to solve the Laplace’s equation and next compute the difference of the obtained solution with the observed data,
- solve the Poisson’s equation (adjoint equation),
- find velocity in the normal direction,
- update the level set function,
- reinitialize the level set function.

*Fig. 4. The model of typical flood embankment. Electrodes of the control system are indicated*

*Fig. 5. The 2D geometrical model of flood embankment with micro instability. This model has been prepared in order to solve the forward problem by means of the boundary element method. Nodes and normal vectors are indicated. Each subdomain has its own conductivity.*

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**Concept**** of communication and data processing system**

*Fig.6.* *Schematic* *communication* *system*

The system, due to the functions of roles, mainly includes:

- Source variable frequency,
- Multiplexer,
- Data-acquisition system,
- Control unit with digital signal processor.

*Fig.7. Diagram of the data acquisition system*

*Fig.8. The schematic diagram*

- A/D Converter (TI ADS1258)
- General Control System (TI OMAP L-137)
- Forming and Control Circurit for Power System (Base on MC34063 and amplifier TDA7056)
- Analog Multiplexers Team (TI CD4067)
- Measuring the tub with 16 measuring electrodes (chrome-nickel) and cables (50 Om, shielded)
- Operational amplifiers (TI OPA365)