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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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Square wave reference digital lock-in detection using non-orthogonal demodulation.

Miao Li1, Yue Sun1, Zhen Liang1

  • 1School of Biomedical Engineering, Anhui Medical University, Hefei, 230032, China.

Heliyon
|January 26, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a new digital lock-in detection algorithm using a square wave reference. It removes the sampling rate constraint, enabling easier frequency sweep measurements.

Keywords:
Digital lock-in detectionNon-orthogonal demodulationSampling rateSquare wave-referenceWeak signal detection

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Area of Science:

  • Electrical Engineering
  • Signal Processing
  • Measurement Science

Background:

  • Digital lock-in detection is crucial for measuring signal amplitude and phase.
  • Square wave reference lock-in offers implementation ease and computational efficiency over sine waves.
  • A key limitation of square wave lock-in is the strict sampling rate requirement (integral multiple of 4).

Purpose of the Study:

  • To develop a novel digital lock-in detection algorithm for square wave reference signals.
  • To eliminate the constraint on the sampling rate relative to signal frequencies.
  • To facilitate frequency sweep measurements with a fixed sampling rate.

Main Methods:

  • A new algorithm for square wave digital lock-in detection was developed.
  • The algorithm accommodates various relationships between sampling and signal frequencies.
  • Specific calculation equations are provided for different frequency ratios.

Main Results:

  • The proposed algorithm successfully removes the sampling rate constraint.
  • Simulations demonstrated the algorithm's feasibility.
  • Experimental validation confirmed the practical applicability of the new method.

Conclusions:

  • The novel algorithm enhances the flexibility of square wave digital lock-in detection.
  • It simplifies implementation by removing sampling rate restrictions.
  • This advancement is beneficial for frequency sweep measurements in various applications.