winforms pdf 417 reader

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To facilitate the identi cation of the dark spots on the Hartmann plate, it is necessary that the photographic plate or detector be placed outside the caustic limits The source can be any light that is dim, or dimmed, enough to permit long exposure times, which do not result in overexposure of the photographic plate or detector Exposure times in the range 90 180 s, depending on source brightness, should be suf cient to average random air turbulence The photographic plate or detector should be very close to being perpendicular to the optical axis; otherwise, a ctitious astigmatism will be obtained from the data reduction There are several ways of orienting the plate holder correctly A straightforward approach is to load the holder with a clear glass plate that has a cross hair scribed at its center.

Then, with an alignment telescope, a zone on the mirror is viewed through the center of the plate The alignment scope is rst brought into alignment with the mirror, and then the fainter return from the glass plate is centered by tilting its holder With the screen and source properly located, one or more photographic plates are recorded, usually at a position between the source and its conjugate image The location of the dots obtained on the photographic plate can then be determined to a high degree of accuracy with a micro-densitometer having an x-y traveling stage Typically, a position of uncertainty of less than 0003 mm can be expected This error represents a surface tilt uncertainty of 0015 s of arc 1:41 10 7 rad for a mirror having a radius of curvature of 213 m as in the case of the 4-m primaries.

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The measuring stage is one of the few critical aspects of the test When the photographic plate is placed in the micro-densitometer, this instrument is made to have its two perpendicular cross hairs present on a viewing screen through which the plate can also be seen These cross hairs are aligned with the two rows of dots that correspond to the two perpendicular rows of holes in the square array, and which intersect at the center of the screen The rows of dots do not form straight lines unless a very good mirror is under test The plate and cross hairs are aligned through a succession of small plate rotations and displacements until some minimal departure is obtained The task is easy with a mirror nearing completion because the dots line up nicely.

This chapter explained how to create script files to automate repetitive commands. You read about the following: Creating script files that contain commands, options, and values in command-line format Running script files from within a drawing or when loading AutoCAD or AutoCAD LT Creating slides from the display in your viewport and creating a script file that displays several slides, one after another, thus resulting in a slide show Organizing your slides into slide libraries In the next chapter, you read about how to create your own linetypes and hatch patterns.

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In general, if the pattern is physically large, say of the order of 60 mm, alignment can be made with a possible rotation error of less than 30 s of arc for the plate relative to the cross hairs This error has little effect on the test results, as can be shown through repeated measurements of the same plate with slightly differing alignment.

Figure 4-42: The Web Capture Preferences dialog box opens after choosing Edit Preferences Web Capture.

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