Analog with integrated filter

The performance of SCR integrated filters is characterized by the deNOx performance, analogous to catalysts based on flow-through substrates, combined with the additional requirements for the filter component, such as pressure drop, filtration, and thermal robusmess under regeneration conditions. In addition, we have to consider the presence of soot and ash within the component and their influence on all the performance aspects including the reactions. In the following sections, each of these characteristics will be discussed in terms of basic fundamentals and design aspects. 

Figure 8. A plot of measured upconverted signal intensity (PMT voltage) vs. fluorescence intensity at fixed delay time. The data were acquired using Method A, and the fluorescence intensity was varied with neutral density filters. PMT voltage was monitored by integrator and hold electronics followed by an analog to digital converter.

The dual-path storage oscilloscope is a device fitted with two independent analog inputs, a two-channel AD converter, a two-channel monitor, two input memories and one output memory, and a DA converter with an integrated analog filter. 

As a rule analog filters are connected on line with the signal source. Digital filtering takes place after AD conversion and storage of the data it is seldom possible to work up the data source immediately. They should thus be stored temporarily on the PC-integrated RAM or permanently on a discette or on tape. 

---