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  • Broadband radiometric measurement of light-emitting diodes with a photodiode
      For idonus sàrl, I wrote a White Paper entitled: "Broadband radiometric measurement of light-emitting diodes with a photodiode."

      Abstract –The spectral power distribution of a light-emitting diode (LED) has a distinctive asymmetrical gaussian shape. This is the macroscopic expression of finely tuned properties buried inside the semiconductor. In this White Paper, we unveil why and how a photodiode can be used as a reliable radiometric instrument for the characterisation of broadband LEDs. The key idea is to use prior knowledge of the centroid wavelength of the emitted light and account for it to calculate the responsivity of the photodiode.

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  • Ferdinand Berthoud FB 1L: Blender model of the moonphase complication
      Watch this video on YouTube in which I present my 3D animated model of the FB 1L complication.
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  • Observablehq.com
      Check out my Observable notebooks where I present some visualization data on: Astronomy, Maps, Mathematics, Colour, Curves & Graphs.
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  • Sketchfab.com
      I have published many 3D models on Sketchfab that are free to download. In particular, you can check out my 3D models of watch mechanisms.
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  • Tycho Brahe's observations of the planet Mars (1582 - 1600)
      I published a short video on YouTube with screenshots of a javascript coded interface that allows to visualize the observations of the planet Mars made by Tycho Brahe between 1582 and 1600.
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INTRODUCTION
C. Yamahata, Ph.D. (2005) and M.Sc. (2000) in Microengineering, graduated from the EPFL (Lausanne, Switzerland).

My R&D activities are mainly focused on the development of Micro Electro Mechanical Systems (MEMS) dedicated to scientific instrumentation.
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motorized rotary union Photograph of a motorized rotary union designed for high vacuum.


capillary passive valve Photograph of a setup using the principle of capillary passive valve to interface a bio-MEMS device with a chamber filled with a culture medium.
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photo microtweezers Photograph of Silicon Microtweezers fabricated by Silicon-On-Insulator (SOI) technology.
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