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Effect of mains interference on time coherent averaging
1Laboratory for Medical Physics & Informatics, University of Amsterdam, The Netherlands.
Medical & Biological Engineering & Computing
|September 1, 1992
Summary
Mains interference significantly impacts time coherent averaging, even with internal triggers. This study demonstrates that averaging cannot eliminate this interference, affecting signal integrity.
Area of Science:
- Signal Processing
- Electrical Engineering
- Physics
Background:
- Time coherent averaging is crucial for signal analysis.
- Mains interference poses a challenge in sensitive measurements.
- Internal triggers are commonly used in signal acquisition systems.
Purpose of the Study:
- To investigate the impact of mains interference on time coherent averaging.
- To analyze the effects of time jitter caused by interference.
- To quantify the deformation of signals due to this jitter.
Main Methods:
- Derivation of the general distribution of time jitter.
- Application of the derived jitter distribution to a simplified signal model.
- Computation of the deformation on a step signal.
Main Results:
- Mains interference introduces time jitter that affects coherent averaging.
- The derived jitter distribution characterizes the interference's impact.
- Averaging does not remove the interference-induced jitter.
- Signal deformation, particularly on step signals, was quantified.
Conclusions:
- Mains interference is a fundamental limitation for time coherent averaging with internal triggers.
- The derived jitter distribution provides a tool for predicting signal deformation.
- Mitigation strategies may be necessary to overcome this interference in precise measurements.