MSc D.M. van Willigen

PhD student
Electronic Instrumentation (EI), Department of Microelectronics

Expertise: Analog, High-Voltage and Mixed-Signal circuit design for Ultrasound applications


Douwe van Willigen was born in Zeist, the Netherlands in 1991. He followed the honours programme bachelor at the Electronic Instrumentation Laboratory of Delft University of technology, working on an in-air ultrasonic gesture detection system.

In his master Douwe worked on an ASIC for Intravascular Ultrasonic imaging. He received his M.Sc. degree in Microelectronics at the TUDelft (2017).

Douwe is currently pursuing the Ph.D. degree at the Electronic Instrumentation Laboratory working on ultrasonic flow measurement.

Precision Ultrasonic Flow Meters using Matrix Transducers

In this project, we will develop a new class of clamp-on ultrasonic flow meters using matrix transducers

Integrated Circuits for Intra-Vascular Ultrasound Imaging

In this project, we develop integrated circuits to enable the next generation of 3D intra-vascular ultrasound probes

  1. Clamp-on Ultrasonic Flow-metering via Matrix Transducers
    J. Massaad; P. van Neer; D. van Willigen; N. de Jong; M. Pertijs; Martin Verweij;
    In Proc. Int. Conf. on Ultrasonic-based Applications,
    June 2018.

  2. ASIC design for a single-cable 64-element ultrasound probe
    D. van Willigen; J. Janjic; E. Kang; Z. Y. Chang; E. Noothout; M. Verweij; N. de Jong; M. Pertijs;
    In Proc. IEEE International Ultrasonics Symposium (IUS),
    IEEE, pp. 1-4, October 2018.
    Abstract: ...
    This paper presents an ASIC (Application Specific Integrated Circuit) design for a catheter probe that interfaces 64 piezoelectric elements directly integrated on top of the ASIC to an imaging system using a single micro-coaxial cable. Each of the piezo elements can be used for both transmit (TX) and receive (RX), enabling full synthetic aperture imaging. A prototype has been realized with a 1.5mm diameter circular layout, intended for 3D intra-vascular ultrasound imaging. The functionality of this ASIC has been successfully demonstrated in a 3D imaging experiment. The design allows a single-element transducer to be replaced by a transdcuer array while using the same cable, making it a promising solution for 3D imaging with size constrained probes.

  3. Feasibility of ultrasound flow measurements via non-linear wave propagation
    J. Massaad; P. L. M. J. van Neer; D. M. van Willigen; N. de Jong; M. A. P. Pertijs; M. D. Verweij;
    In Proc. IEEE International Ultrasonics Symposium (IUS),
    IEEE, pp. 1-4, October 2018. DOI: 10.1109/ULTSYM.2018.8579943
    Abstract: ...
    Typically, ultrasonic flow meters assume linear wave propagation. Nevertheless, if the transducers of an ultrasonic flow sensor excite a pressure wave with a high amplitude, nonlinear wave propagation effects become significant. The appearance of higher harmonics increases the bandwidth of the received signal, which may potentially lead to a more precise flow measurement. However, the question arises whether the increased bandwidth can be used in practice, since the intensity of the 2nd harmonic can be 25 dB below the fundamental. One exploit of the increased bandwidth is to filter the received signals and to obtain two components: the fundamental and the 2nd harmonic. Differences between the upstream and downstream transit times are directly related to the flow speed, and these can be computed for each component of the received signals. This paper shows that averaging the transit time differences of the fundamental signals and the 2nd harmonic signals results in a lower standard deviation compared to the standard deviation of the transit time differences of the fundamental or the 2nd harmonic signal alone. This demonstrates the feasibility of using non-linear wave propagation to improve the precision of flow measurements using ultrasound.

  4. Minimizing the zero-flow error in transit time ultrasonic flow meters
    D. van Willigen; P. van Neer; J. Massaad; N. de Jong; M. Verweij; M. Pertijs;
    In Proc. IEEE International Ultrasonics Symposium (IUS),
    IEEE, pp. 1-4, October 2018. DOI: 10.1109/ULTSYM.2018.8579771
    Abstract: ...
    Transit-time ultrasonic flow meters are based on the fundamental idea that the flow is the only non-reciprocal effect between an upstream and downstream measurement. Non-identical transducers can be used in a reciprocal manner if the circuit is made reciprocal. In this paper we analyze the effect of driver- and readout electronics on the zero-flow error in transit-time ultrasonic flow meters by simulation and measurement. Using the frequency characteristic of two nonidentical transducers, the cause of the zero-flow error in nonreciprocal circuits is evaluated. Both simulation and measurement results show that the lowest zero-flow error can be obtained by using circuits that have an impedance significantly higher or lower than the impedance of the transducers.

  5. Data collection system, in particular suitable for imaging of a distant object
    D. M. van Willigen; M. A. P. Pertijs;
    Patent, Dutch February 2018.

  6. A Transceiver ASIC for a Single-Cable 64-Element Intra-Vascular Ultrasound Probe
    Douwe {van Willigen};
    MSc thesis, Delft University of Technology, July 2017.

  7. In-air ultrasonic gesture sensing with MEMS microphones
    D. M. van Willigen; E. Mostert; M. A. P. Pertijs;
    In Proc. IEEE Sensors Conference,
    IEEE, pp. 90‒93, October 2014. DOI: 10.1109/icsens.2014.6984940

  8. Electronic Conversion from a Scanning Radiometer to a Stereographic Projection Geometry
    H.J. Lincklaen Arriens; H. Vrijmoed; D. van Willigen; J.P. de Jongh;
    Journal of Applied Meteorology,
    Volume 17, Issue 7, pp. 1071-1076, July 1978.

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Last updated: 27 Dec 2018