Antonius Johannes Josephus Rademakers

Miniaturized ultrasound scanner by electrowetting

An ultrasound imaging technology based on electrowetting has been developed and integrated in a miniaturized ultrasound scanner. The feasibility of scanning the ultrasound beam of a single-piston transducer in a three-dimensional space by using electrowetting is demonstrated. The technology has a high potential to be embedded in devices where size restrictions do not allow the use of traditional ultrasound phased-array transducers.

54.1: Invited Paper: A Novel Cathode for CRTs based on Hopping Electron Transport

The Hopping Electron Cathode (HEC) is a novel low-drive electron source, which can be used in CRTs to reduce the cost of the set electronics and to improve the image quality. It is based on a self-regulating secondary emission process enabling transport of electrons over insulating surfaces. The HEC utilizes this mechanism to compress electrons coming from a large conventional cathode into a small funnel structure of insulating material. The exit of the funnel serves as a high-brightness electron source for a CRT and can be used to reduce the spot size.