| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve the problem in which a mixing scheme obtained by modulating a gain of a detector in a parallel multifrequency instrument is very ineffective in an apparatus and method for measuring and determining multiple fluorescence decay times.SOLUTION: A system and method is provided for improved fluorescence decay time measurement are provided. A digital heterodyning technique is disclosed in which a photon detector is sampled at a rate slightly faster than a digitally pulsed excitation signal. A resulting cross correlation frequency is low enough to be read by inexpensive electronics such as by a field programmable gate array. Phase information in the signal provides correlation with corresponding photon detection.</p> |
