Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Design and Fabrication of Miniaturized Optical Chopper Operated by Electromagnetic Actuation

  • Kim, Ho Won (School of Electronics Engineering, Kyungpook National University) ;
  • Min, Seong Ki (Advanced propulsion Technology Center, ADD) ;
  • Choi, Young Chan (School of Electronics Engineering, Kyungpook National University) ;
  • Kong, Seong Ho (School of Electronics Engineering, Kyungpook National University)
  • Received : 2014.05.14
  • Accepted : 2014.05.22
  • Published : 2014.05.31
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Abstract

An existing infrared (IR) analysis system is generally composed of infrared source, IR focusing lenses, IR detector, and optical chopper. An optical chopper is widely used in combination with lock-in amplifier to improve the signal-to-noise ratio by periodically interrupting incident light beam. During recent years, a few researches on miniaturized optical chopper have been reported to apply to micro-scaled optical systems. In this paper, a micro optical chopper operated by electromagnetic actuation is proposed and applied to a miniaturized micro-scaled optical system operating in IR spectral range. Additionally, the fabrication method of the proposed micro chopper is demonstrated. The proposed micro optical chopper is composed of the polydimethylsiloxane (PDMS) membrane, solenoid, and permanent magnet. The permanent magnet is bonded on the PDMS membrane using an ultraviolet-activated adhesive. The operation of the chopper is based on the attractive and repulsive forces between permanent magnet and solenoid induced by an electrical current flowing through the solenoid. The fabricated micro optical chopper could operate up to 200 Hz of frequency. The maximum operating distance of the chopper with 7mm diameter membrane was $750{\mu}m$ at 100 Hz of frequency.

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References

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