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- Model SL7 USAF 1951 - Test Target
Model SL7 USAF 1951 -Test Target
A resolution test pattern conforming to MIL-STD-150A standard, set by US Air Force in 1951. It is still widely accepted as the default pattern to test the resolving power of optical imaging systems such as microscopes, cameras and image scanners. The pattern consists of groups of three bars (small Ronchi rulings) with dimensions from big to small. The largest bar the imager cannot discern accurately is the limitation of its resolving power.
CONFIGURATION
- Material: Chrome on Transparent Soda Lime Glass, 1.5mm thick , available as 3" (75mm)
- Material: Chrome on White Glass, 1.25mm thick , available as 4" (100mm)
PATTERN DESCRITION
Chrome on Glass - Standard resolution
Includes groups 0-6 , with line width tolerance of +/- 0.8um
Chrome on Glass - Medium resolution
Includes groups 0-7 , with line width tolerance of +/- 0.4um
Chrome on Glass - High resolution
Includes groups 0-8 , with line width tolerance of +/- 0.2um
Polyester Film - Standard resolution
Includes groups 0-4 , with line width tolerance of +/- 4um
Polyester Film - High resolution
Includes groups 0-6 , with line width tolerance of +/- 2um
LINE PAIR DIMENSION
This chart is available as Low Reflective Chrome on Glass as the standard product, but also available on Polyester Film. The COG (Chrome on Glass) version contains elements 0-6 for the standard resolution chart, and groups 0-8 for the highest resolution, whereas the Polyester Film version has groups 0-4 for the standard resolution and groups 0-6 for the high resolution.
BASE MATERIAL
This chart is available as Low Reflective Chrome on Glass as the standard product, but also available on Polyester Film. The COG (Chrome on Glas) version contains elements 0-6 for the low resolution chart, groups 0-7 for the medium resolution chart, and groups 0-8 for the highest resolution, whereas the Polyester Film version has groups 0-4 for the standard resolution and groups 0-6 for the high resolution.
TURNAROUND
Our standard production turnaround is 5 days from receipt of order. We can offer faster services if required for more urgent orders.
INSPECTION
STANDARD: We inspect the piece by eye for flaws, design inaccuracies and contaminations. We measure the design to check that it conforms to the specifications, and record both of these measurements on our internal inspection records. Finally, we find the CD of the mask, measure that, record it, and also take a digital photo that is saved with the inspection log. We use Nikon MM40 at 900x magnification and an OGP ZIP 300 at 400 x magnifications for this.
CERTIFIED: In addition to the standard inspection process described above, we will then document them via a Certificate of Conformance - or measurement certificate - which we supply with the target. Tolerances are per our standard tolerances.