Advanced Time-Correlated Single Photon Counting Applications by Wolfgang Becker

By Wolfgang Becker

This booklet is an try and bridge the distance among the instrumental ideas of multi-dimensional time-correlated unmarried photon counting (TCSPC) and average purposes of the procedure. Written by means of an originator of the process and by means of sucessful clients, it covers the elemental ideas of the strategy, its interplay with optical imaging tools and its program to quite a lot of experimental projects in existence sciences and scientific research.

The e-book is usually recommended for all clients of time-resolved detection recommendations in biology, bio-chemistry, spectroscopy of reside structures, stay telephone microscopy, medical imaging, spectroscopy of unmarried molecules, and different functions that require the detection of low-level gentle signs at single-photon sensitivity and picosecond time resolution.

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The third class of FLIM applications is the extraction of metabolic parameters from the lifetimes of endogenous fluorophores. Most autofluorescence FLIM applications use the fact that that the fluorescence lifetimes of NADH and FAD depend on the binding to proteins [91, 119]. Bound and unbound fractions can therefore be distinguised by double-exponential decay analysis and characterised by the amplitudes and lifetimes of the decay components. The ratio of bound and unbound NADH depends on the metabolic state [29, 40, 42, 56, 67, 137, 138].

14. The architecture of multi-wavelength FLIM is shown in Fig. 27. A spectrum of the fluorescence light is spread over an array of detector channels. For every photon, the time in the laser pulse period, the wavelength-channel number in the detector array, and the position, x, and y, of the laser spot in the scan area are determined. These pieces of information are used to build up a photon distribution Fig. 26 Eight-channel parallel FLIM of a drosophila eye. Autofluorescence. Excitation at 407 nm, detection wavelength from 480 to 620 nm.

It can 1 Introduction to Multi-dimensional TCSPC 23 therefore be used at extremely high photon rates and scan speeds. The disadvantage is that the available memory space is limited. A typical application of hardwareaccumulation is the ‘Preview’ mode of FLIM systems where images must be recordable up to almost any count rate and displayed at high image rate, but with a relatively moderate number of pixels and time channels. e. the configuration shown in Fig. 11, right. The TCSPC device transfers the data of the individual photons and the clock pulses to the computer, and the photon distribution is built up by software.

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