Resolution Test Targets

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The USAF 1951 Resolution Target

Minimum feature size for our resolution test targets is 1um.  Opto-Line can delineate to the 8th group, 6th element (456 line pairs/mm).

1941                   USAF_1-951_ConvChart_CloserCrop

 

Resolution-Target_202

The 1951 USAF resolution test chart is a resolution test pattern conforming to MIL standards, set by US Air Force in 1951. It is still widely accepted to test the resolution of optical imaging systems such as microscopes, cameras and image scanners.  The common format consists of six “groups” in three layers of patterns. The largest groups, forming the first layer, are located on the outer sides. The smaller layers repeat the same pattern but are progressively smaller toward the center. Each group consists of six elements, numbered from 1 to 6. Within the same layer, the odd-numbered groups appear contiguously from 1 through 6 from the upper right corner. The first element of the even-numbered groups is at the lower right of the layer, with the remaining 2 through 6, at the left.  However, Opto-Line can provide up through the 8th group.

Number of Line Pairs / mm in USAF Resolving Power Test Target 1951
Group Number
Element -2 -1 0 1 2 3 4 5 6 7 8
1 0.250 0.500 1.00 2.00 4.00 8.00 16.00 32.0 64.0 128.0 256.0
2 0.281 0.561 1.12 2.24 4.49 8.98 17.96 35.9 71.8 143.7 287.4
3 0.315 0.630 1.26 2.52 5.04 10.08 20.16 40.3 80.6 161.3 322.5
4 0.354 0.707 1.41 2.83 5.66 11.31 22.63 45.3 90.5 181.0 362.0
5 0.397 0.794 1.59 3.17 6.35 12.70 25.40 50.8 101.6 203.2 406.4
6 0.445 0.891 1.78 3.56 7.13 14.25 28.51 57.0 114.0 228.1 456.1