Measuring Particle Positions in Micro Channel with Multifiber Array
Ichiro Okuda*, Yasushi Mae*, Kenichi Ohara*,
Tomohito Takubo**, and Tatsuo Arai*
*Department of Systems Innovation, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
**Department of Physical Electronics and Informatics, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
This paper proposes position measurement of particles in micro channels fabricated on a polydimethylsiloxane (PDMS) chip using a two-layer plastic optical fiber (POF) array. Particle positions are measured by irradiating the POF array with laser light and measuring the decrease in POF output power posed by the presence of the particle. Our proposed sensor provides three dimensional measurements in the micro channel along the directions of the length, depth and the width. We demonstrate that plural particles of different diameters can be measured with our proposed sensor in which two layers of POF are vertically aligned or shifted along the flow direction. The effects of optical misalignment of POF array with respect to the measurement are theoretically and experimentally evaluated.
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