Spot And Patch Aperture
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Date Created: 2/25/2013 Date Modified: 5/21/2014
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Patch / Aperture Size requirements
Maximal Aperture Size Recommendation
Spot Mode
Scan Mode
Patch Size
Spot only
max aperture size
Strips 10cm/4
Strips 10cm/4 to 75cm/30
Strips 75cm/30
2mm
1.5mm
-
3mm
4mm
5mm
6mm
7mm
8mm
9mm
For spot readings, it is always recommended to use the largest aperture size possible. If the instrument is used for scanning as well, scan mode will dictate the aperture size.
Aperture Specifications
Aperture Size
Measurement
area size
Opening in
target window
Opening in scan chassis target window
Screening Range
3.5mm
4.0mm
175 lines/inch or 69 lines/cm or above
2.0mm
4.5mm
133 lines/inch or 52 lines/cm or above
6.0mm
6.5mm
65 lines/inch or 26 lines/cm or above
8.0mm
8.5mm
For each eXact aperture size, the target window size is 1 mm on radius larger than the spot measurement area size. This 1 mm over iluumination of the measurement area is required by ISO5/4. The white area around the patch, does not influence the measurement data, but does require the operator to center the measurement sample in the target window opening.
The illustration below shows how this minimum measurement area appears in relation to the target window opening.
The black circle represents the target window opening.
The white circle represents the actual measurement area which equals the aperture size.
The magenta square represents the minimum suggested patch size.
This can be used as a guide for operators when placing the instrument optics over patches which do not completely fill the target window opening.
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