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Direct measurement of fast transients by using boot-strapped waveform averaging
Mattias Olsson1, Fredrik Edman1, Khadga Jung Karki2
1Department of Electrical and Information Technology, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden.
The Review of Scientific Instruments
|April 2, 2018
Summary
This study introduces coherent sampling, a method using digital cavities to improve signal analysis. It effectively boosts sampling rates and signal-to-noise ratios for repetitive signals, demonstrated with Rhodamine 6G fluorescence lifetime measurements.
Area of Science:
- Analytical Chemistry
- Physical Chemistry
- Signal Processing
Background:
- Coherent sampling is crucial for analyzing repetitive signals accurately.
- Existing methods may have limitations in enhancing both sampling rate and signal quality simultaneously.
- Accurate fluorescence lifetime measurements are vital in various scientific fields.
Purpose of the Study:
- To present an approximation to coherent sampling, termed boot-strapped waveform averaging.
- To demonstrate the utility of digital cavities in achieving coherent sampling conditions.
- To validate the method by measuring the fluorescence lifetime of Rhodamine 6G.
Main Methods:
- Developed an approximation to coherent sampling using digital cavities.
- Applied the method to digitize signals from a fast avalanche photodiode.
- Measured the fluorescence lifetime of Rhodamine 6G.
Main Results:
- The proposed method successfully determined the condition for coherent sampling.
- Achieved simultaneous increases in effective sampling rate and signal-to-noise ratio.
- Directly measured a fluorescence lifetime of 4.0 ns for Rhodamine 6G.
Conclusions:
- The presented coherent sampling approximation is effective for repetitive signals.
- The method provides accurate fluorescence lifetime measurements, validated against known values.
- This technique offers a valuable tool for enhancing signal analysis in scientific measurements.
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