Time gated filtering

The joint gate function is centered around the frequency wo and the time to and acts as a filter on the bare signal /. As an example we shall consider the case when the spectral gate is given by the Fabri-Perot etalon [16] and the time gate is exponential,... 

In addition, the luminescence lifetime of quantum dots is approximately one order of magnitude longer than that of their organic counterparts.30 Thus, the autofluorescence of biological samples can effectively be filtered, for example, with time-gated measurements, in the case of these inorganic luminophores. Moreover, QDs are also particularly interesting for multiplexed analysis because of two of their inherent... 

Keywords Fluorescence lifetime Fluorometer Optical filters Optical materials Photon counting Spectrofluorometer Time-resolved fluorometry Time-gating... 

Here Et t to) is the time-gate function which is strongly peaked near the gating time t to, the function Fg t — t, wq) is responsible for the spectral filtering near the central frequency wq, and (E(r,t )E (r,t")) is the correlation function of the emitted field. It is clear from this definition that the TFG SE spectrum is always positive, in contrast to its bare counterpart. 

Here ,(0 is the time gate function and y determines the width of the frequency filter. It is easy to verify that the TEG SE spectmm can be expressed through the convolution of Ase (6 with the corresponding joint TEG function se ... 

The water had the pec aliar fish-1 ike smell of the masses otflab—uha iniestinalis—floating on the surface.. The stones on the sides of the canals, the hurdles placed to keep up the banks, floating pieces of stick, and indeed every solid body with which the water came in contact, were coated with a reddish-brown deposit, similar to that which was found to separate from the filtered water In Amsterdam. This deposit was observed to be particularly abundant near the iron sluice gates. A pipe from one of the mains in the city was examined at the same time, and found to be coatad on the inside with a thick slimy deposit of vegetal remains, which presented under the miorcscopo an appearance exactly similar to that of the deposits above alluded to. 

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