**3. Conclusion**

We have exposed in this chapter two very rich and complementary approaches of the modelling of resistive electrothermal sensors. The first one uses the Laplace transform in order to allow a modelling of the sensor in terms of transfer functions. This opens the way to new modes of utilization of the electrothermal sensors, such as the absolute anemometry or thermal characterization of materials. This approach also allows to develop inverse analysis methods, in order for example to better consider and compensate the influence of the self-heating on the accuracy of thermal measurements using resistive sensors. The second approach exposed here uses an electrothermal analogy inspired from the Godunov scheme. It allows to consider more extreme situations than those considered by the transfer functions approach and also to envisage systemic approaches of the modes of operation of the resistive electrothermal sensors. This could be of great help to the designers of new instrumentation apparatus in the field of thermal measurement and materials and flow characterization. The same processes of modelling may be applied in the same way to the NTC resistive sensors made of semiconductors.
