Jakob Juul Larsen

Lektor

Jakob Juul Larsen

Profil

I joined Ingeniørhøjskolen i Aarhus, now Aarhus University School of Engineering in 2005. In 2013 I moved to the Department of Engineering where I am currently Associate Professor specializing in applied digital signal processing.

Current research projects 

Magnetic resonance sounding (MRS). MRS is an electromagnetic method for ground based non-invasive measurements of groundwater systems in the upper 100 m of the subsurface. The method is the only geophysical method that can directly determine the water content. Further, the method also provides information on the geological layers from which estimates of hydraulic conductivity are obtained. MRS suffers from a low signal-to-noise ratio. The amplitude of the signal is fixed by the water content. Thus the only way to increase the signal to noise ratio is to devise better signal processing methods. I work together with the Hydrogeophysics Group at Department of Geoscience on solving the signal to noise ratio problem of MRS using e.g. adaptive and model-based signal processing. 

Transient electromagnetic method (TEM). TEM is used for ground based or airborne resistivity measurements of the subsurface. Resistivity is correlated with the geological layers and is used for groundwater measurements and for mining purposes. I work with the Danish company SkyTEM and the Hydrogeophysics Group at Department of Geoscience in a project supported by Innovation Fund Denmark (Formerly Danish National Advanced Technology Foundation). The goal of the project is to build the next generation hardware and software for mapping of groundwater systems. In the project we work on new signal processing algorithms that can utilize the many possibilities opened up by the new hardware. 

Direct current induced polarization (DCIP). DCIP is a geophysical method for mapping the frequency dependent resistivity of the subsurface. It is used for several purposes, one important application is for mapping of polluted areas. Like all electromagnetic geophysical methods, DCIP is also susceptible to electromagnetic noise and methods are needed to suppress the noise. I have recently started to work with Lunds Tekniska Högskola and the Hydrogeophysics Group at Department of Geoscience  on solving the noise problems of DCIP. 

I work with several companies in the region on various aspects of signal processing applied in audio systems. One current project is a collaboration with the companies SoundFocus and TC Electronics. The project goal is to build optimized loudspeaker arrays with digital correction of nonlinearities in the drivers. The project is supported by Industriens Fond and Netværk for Dansk Lydteknologi.

Teaching activities

My current teaching activities are supervision of bachelor, master and Ph.D. students and teaching courses on:

- Applied linear algebra

- Adaptive filters

- Advanced digital signal processing

- Microphone array signal processing

 

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