High speed fluorescence lifetime measurement by dual channel waveform measurement

Youngjae Won; Dug Y. Kim

doi:10.1117/12.874336

11 February 2011 High speed fluorescence lifetime measurement by dual channel waveform measurement

Youngjae Won, Dug Y. Kim

Proceedings Volume 7902, Imaging, Manipulation, and Analysis of Biomolecules, Cells, and Tissues IX; 79021W (2011) https://doi.org/10.1117/12.874336
Event: SPIE BiOS, 2011, San Francisco, California, United States

Abstract

Analog mean-delay (AMD) method is a new powerful alternative method in determining the lifetime of a fluorescence molecule for high-speed confocal fluorescence lifetime imaging (FLIM). Even though the photon economy and the lifetime precision of the AMD method are proven to be as good as the state-of-the-art time-correlated single photon counting (TC-SPC) method, there have been some speculations and concerns about the accuracy of this method. In the AMD method, the temporal waveform of an emitted fluorescence signal is directly recorded with a slow digitizer whose bandwidth is much lower than the temporal resolution of lifetime to be measured. We have found that the drifts and the fluctuations of the absolute zero position in a measured temporal waveform are the major problems in the AMD method. We have also proposed dual channel waveform measurement scheme that may suppress these errors. It is shown that there may exist more than 2 ns drift in a measured temporal waveform during the period of the first 12 minutes after electronics components are turned on. The standard deviation of a measured lifetime after this warm-up period can be as large as 51 ps without a proposed scheme. We have shown that this error can be reduced to 9 ps with our dual-channel waveform measurement method.

Citation Download Citation

Youngjae Won and Dug Y. Kim "High speed fluorescence lifetime measurement by dual channel waveform measurement", Proc. SPIE 7902, Imaging, Manipulation, and Analysis of Biomolecules, Cells, and Tissues IX, 79021W (11 February 2011); https://doi.org/10.1117/12.874336

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KEYWORDS

Luminescence

Data acquisition

Fluorescence lifetime imaging

Laser sources

Picosecond phenomena

Electronic components

Confocal microscopy

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