The following topics are currently available for master and bachelor students who have to work on their final thesis.
If you are interested please contact Ing. Mattia Butta, Ph.D. by writing an email (buttamat@fel.cvut.cz), or directly going to lab n.9 in hall laboratories.
Some knowledge of English is required (but don’t be afraid, the supervisor speaks Czech too)
Topic n. 1 – Comparison between noise of orthogonal fluxgate and off diagonal GMI
There are two sensors which are very similar: orthogonal fluxgate in fundamental mode and off-diagonal GMI.
The signal is extracted in a different way for the two sensors. In both cases you have advantages and disadvantages.
So far nobody made a complete study of disadvantages and disadvantages of both method, so we don’t know which is the optimum.
The student will analyze both methods, create simple circuits and measure different noise sources and finally compute the best solution.
Topic n. 2 – Low noise magnetometer for orthogonal fluxgate
Orthogonal fluxgate in fundamental mode is a very precise magnetic sensor.
We have developed sensor we noise as low as 1pT/√Hz at 1 Hz, the lowest noise for this kind of sensor.
However, we have a problem. The noise of the sensor is so low, that for frequency higher than 40 Hz the noise of the electronic circuit becomes predominant and covers the noise of the sensor.
The task of this thesis is to develop a new electronic circuit to extract the signal from the sensor with noise lower than the (very) simple circuit used so far.
The student will analyze the current circuit, will investigate alternative components available on the market and will design the new circuit. Finally he will test the circuit and characterize the noise.
Topic n. 3 – Magnetic gradiometer based on orthogonal fluxgate
So far orthogonal fluxgate in fundamental mode has been used to measure the magnetic field produced by human heart because it has very low noise and it can measure very tiny field.
However, it has been always used in a configuration of uniform field sensor.
This is not ideal, because magnetic field produced by human heart is not uniform at all, it is a gradient. Therefore, it is better to use the sensor as gradiometer, but nobody has done it yet.
The student will make some simulation with finite elements method to understand which is the best configuration for the coils in gradiometric structure, and then he will measure the noise and characterize the real sensor.
Topic n. 4 – Orthogonal fluxgate in fundamental mode with magnetic tapes
So far everybody used magnetic wires as core for orthogonal fluxgate in fundamental mode.
However, nobody has tried to use magnetic tapes for this purpose yet. Mainly because they are larger, but there are some applications where the width is not a big deal.
The student will build some sensors with tapes and he will characterize their behavior to understand if tapes is a valid alternative to wires.
