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The PPR is a Cassegrainian Dall-Kirkham telescope with a 10-cm aperture, a 50-cm focal length, and 2.5-mrad instantaneous field of view.
The PPR main housing is mounted on the top of the electronics, which consists of a set of four stacked modules, which, in turn, are mounted onto the base plate.
The PPR makes polarimetry and photometry measurements by passing the flux collected by the scene-view and space-view telescopes through the optical elements located on the filter/retarder wheel, the Wollastom prism, and the chopper to two lenses that focus it on the two silicon photodiodes.
PPR has also support for PPD files (PostScript Printer Description files), which are a convenient way to describe a printer's capability in just one file.
PPR also allows for quota charging on a per-user basis, if you are concerned about who is doing what or if you simply want to charge for every sheet of paper coming out of your expensive printers.
PPR proves to be useful in a wide variety of configurations and should not be difficult to adapt to your needs.
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