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Time and frequency -Domain Interpretation of Phase-lag Control01:21

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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Improved phase generated carrier demodulation algorithm for eliminating light intensity disturbance and phase

Youwan Tong1, Hualin Zeng, Liyan Li

  • 1Optoelectronics System Laboratory, Institute of Semiconductors, Chinese Academy of Science, Beijing, China. youwantong@semi.ac.cn

Applied Optics
|October 12, 2012
PubMed
Summary

A new phase generated carrier (PGC) demodulation algorithm improves microvibration measurement stability. This novel PGC algorithm shows superior performance in noisy conditions compared to existing methods.

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Area of Science:

  • Optoelectronics
  • Signal Processing
  • Measurement Science

Background:

  • Traditional phase generated carrier (PGC) demodulation algorithms are susceptible to phase modulation amplitude variations and light intensity disturbances (LID).
  • These disturbances can significantly degrade the performance of remote no-contact measurement systems.

Purpose of the Study:

  • To propose and validate a novel, improved PGC demodulation algorithm that enhances stability against LID.
  • To analyze the impact of phase modulation amplitude variation and LID on PGC algorithms theoretically and experimentally.

Main Methods:

  • Development of a PGC-differential-cross-multiplying (PGC-DCM) based improved algorithm.
  • Theoretical analysis of LID and phase modulation amplitude variation effects.
  • Experimental setup for remote no-contact microvibration measurement under LID.
  • Comparison of the proposed algorithm's performance against the traditional PGC-DCM algorithm using signal-to-noise and distortion ratio (SINAD).

Main Results:

  • The improved PGC algorithm demonstrates enhanced stability in the presence of LID.
  • Under a 50 Hz, 0.3 depth LID, the improved PGC algorithm achieved a SINAD of 19 dB.
  • This SINAD is significantly higher than the 8.7 dB achieved by the PGC-DCM algorithm under identical conditions.

Conclusions:

  • The proposed improved PGC demodulation algorithm offers superior performance and stability for microvibration measurements, particularly in environments with light intensity disturbances.
  • The PGC-DCM approach provides a robust solution for reliable remote sensing applications facing environmental noise.