Ngc For Sensing Applications

By contrast, Fig. 2 shows how the NGC will be connected to a head for AO. In Fig. 2, the same Linux PC is used, but the functionality of the frontend electronics shown in Fig. 1 has been reduced to a volume of only 100^200x40 mm. The complete NGC front-end electronics needed to drive the L3Vision CCDs will be repackaged in two Eurocard size PCBs (160x100 mm) connected via high-speed serial links at 3.125 Gbps. The connection of the AO head to the back-end electronics is done through optical fiber and via the Front Panel Data Port (FPDP) protocol [4].

In the configuration of Fig. 2 the AO head sends the pixel data directly to the real-time computer for number crunching. However, another possible alternative to connect the AO head to the RTC is shown in Fig. 3. In this figure the back-end computer receives the pixel data from the front-end head and transmits it to the RTC for processing. The RTC is a multi-processor VME-based board with a commercial FPGA03 piggy-back daughter card for pre-processing, image calibration and centroiding [5].

Figure 2. NGC for sensing applications. Direct connection of the AO head to the Real Time Computer (RTC).
Figure 3. NGC for sensing applications (second alternative). Pixel data is sent to back-end computer. Back-end computer sends the data to the RTC.

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