Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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Signal Processing Algorithm for a PSD Sensor using Amplitude Modulation/Demodulation

PSD의 신호 처리를 위한 AM 변조 및 복조 회로

  • 라종필 (광주과학기술원 기전공학과) ;
  • 신명관 (광주과학기술원 기전공학과) ;
  • 박기환 (광주과학기술원 기전공학과)
  • Published : 2003.11.21
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Abstract

The signal processing algorithm for a PSD(Position Sensitive Detector) using amplitude modulation/demodulation is addressed in this paper. Dark currents and external noises such as daylight and fluorescent lights are eliminated by using amplitude modulation/demodulation and a low pass filter. The proposed amplitude modulation/demodulation method for a PSD sensor is compared with pulse amplitude modulation method. The proposed amplitude modulation is proved to be more accurate and robust than PAM method by analysis and experiments. Multiple measurements using one PSD sensor by amplitude modulation/demodulation is also addressed. The Power variation of light source is compensated by normalization process using a divider.

Keywords