Development of a Contour Following Measurement System

Eelco Galestien, Philips Drachten

It is important for a shaver to have optimal contact with the skin in order to shave efficiently without causing irritation. To follow the convex and concave curvatures of the face, shavers are equipped with a contour following mechanism. To compare and improve contour fo

The goal of this project was to develop a new measurement system to enable the investigation of the relation between contour following performance and the mechanical settings of the shaver. This new Contour Following Measurement System (CFMS) improves on the shortcomings of the previously used system.

 Contour following has many contributors. An investigation was performed to find the most important ones.

Normal force and skin contact were found to be dominant. Handling proved to be very important as well. The most promising measurement techniques, piezoresistive load cells and skin impedance electrodes, were selected for implementation. To ensure natural handling, the CFMS is designed to shave while measuring and fits inside a production shaver body.

 The sensor assemblies were purpose built, while a production unit served as the basis for the rest of the device. The electronics were designed to fit inside the shaver handle and the mechanical setup was designed around an existing drive train. A new set of performance indicators was derived from the measurement data. Camera images were added to further improve analysis.

Eelco Galestien MSc PDEng

Eelco conducted his PDEng graduation project at Philips Consumer Lifestyle in Drachten, The Netherlands. The project was supervised by Wilko Westerhof, pre-development manager at Philips, and Harry Droog, from the Design and Technology Instrumentation program from TU Eindhoven.