New PDF release: Advanced Time-Correlated Single Photon Counting Techniques

Light

By Wolfgang Becker

ISBN-10: 3540260471

ISBN-13: 9783540260479

ISBN-10: 3540288821

ISBN-13: 9783540288824

Time-correlated unmarried photon counting (TCSPC) is a awesome method for recording low-level mild indications with tremendous excessive precision and picosecond-time solution. TCSPC has built from an intrinsically time-consuming and one-dimensional approach right into a quick, multi-dimensional strategy to checklist gentle signs. So this reference and textual content describes how complicated TCSPC ideas paintings and demonstrates their program to time-resolved laser scanning microscopy, unmarried molecule spectroscopy, photon correlation experiments, and diffuse optical tomography of organic tissue. It supplies useful tricks approximately developing appropriate optical platforms, deciding upon and utilizing detectors, detector protection, preamplifiers, and utilizing the regulate good points and optimising the working stipulations of TCSPC units. complex TCSPC options is an essential instrument for everybody in learn and improvement who's faced with the duty of recording low-intensity gentle indications within the picosecond and nanosecond variety.

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Extra resources for Advanced Time-Correlated Single Photon Counting Techniques (Springer Series in Chemical Physics) (Springer Series in Chemical Physics)

Sample text

6. This technique counts the photon pulses of a high-speed detector directly, using several parallel gated counters. The gates are controlled via separate gate delays and by separate gate pulse generators. If the measured decay curve is completely covered by consecutive gate intervals, all detected photons are counted. The counting efficiency thus approaches one. The counters can be made very fast and, in principle, the count rates are only limited by the detector. With the commonly used PMTs, peak count rates around 100 MHz and average count rates of several tens of MHz can be achieved.

2 Photon distribution detector 2 Mplx. ch. 1 Photon distribution detector n Mplx. ch. n Photon distribution detector 2 Mplx. ch. n Photon distribution detector n Mplx. ch. 2 Photon distribution detector n Mplx. ch. 1 Experiment Trigger Scan Clocks etc. Sequencer T, X, Y, etc. Fig. 6 Multiplexed multidetector system. The result can be considered a number of photon distributions for all combinations of detector and multiplexing channels. Each photon distribution is the photon density over the time in the signal period and the sequencer coordinates The system records the photon distribution over the time in the signal period, the detector channel number, the multiplex-channel number, and one or two additional coordinates determined by the sequencer.

The sequencer switches through the memory blocks of the current bank. Again, each memory block provides space for a full photon distribution versus the time in the signal period, and the detector and multiplexing channel numbers. When the current memory bank is full, the sequencer swaps the memory banks and continues recording. While the measurement is running in one memory bank, the results of the other bank are read and stored to the hard disk. Thus, a virtually unlimited number of decay curves can be recorded without any time gaps between subsequent steps of the sequence [31].

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Advanced Time-Correlated Single Photon Counting Techniques (Springer Series in Chemical Physics) (Springer Series in Chemical Physics) by Wolfgang Becker


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