Optical Resolution Charts, Ronchi Rulings and Grids
The optical resolution charts are used to test characteristics such as resolution, contrast, distortion and modulation transfer function (MTF) of lenses, cameras and optical systems. Ronchi rulings and grids are used to create interference patterns, to measure distortion and for MTF measurements.
EMS offers a range of charts on glass and in metal foil. Customers often require special charts for specific applications and these can be made to your exact requirements.
In addition to these products, we also supply a specialist NPL/HSE test slide for checking the resolving power of phase contrast microscopes – see ref S84 in stage micrometers catalogue.
USAF 1951 Test Chart
USAF resolution charts are recognized the world over as a universal standard for testing the vertical and horizontal resolution of imaging systems. Each element on the chart comprises three vertical bars and three horizontal bars, and the detail on these slides is as fine as 0.78microns (644 line-pairs per mm). The resolution of the imaging system is normally specified as the Group and Element of the finest bars that can be clearly defined.
| Pattern | Cat# | Description | Qty | Price | |
| R70 | 68098-01 | USAF Test Chart Groups 0 to 7 | each | 190.00 | Add to Cart |
R71 USAF Test Chart Groups -2 to 7
Key Features
USAF Test Chart. positive image. Group -2 to Group 7, element 6.
Description
Large Positive Image ~ group -2 to 7
B270 glass, size 75mm x 75mm
| Pattern | Cat# | Description | Qty | Price | |
| R71 | 68098-02 | USAF Test Chart Groups -2 to 7 | each | 190.00 | Add to Cart |
R75P High Resolution Positive Image
Key Features
USAF Test Chart Group 0 to Group 9, Element 3
Sub micron minimum feature size
Description
High Resolution Positive Image
Soda Lime Glass,
50mm x 50mm x 2mm
Sub Micron smallest feature size - bar width 0.00078mm [0.78µm]
| Pattern | Cat# | Description | Qty | Price | |
| R75P | 68098-03 | USAF Test Chart, positive image, groups 0/1 to 9/3 | each | 1100.00 | Add to Cart |
R75N High Resolution Negative Image
Key Features
USAF Test Chart Group 0 to Group 9, Element 3
Sub micron minimum feature size
Description
High Resolution Negative Image
Soda Lime Glass,
50mm x 50mm x 2mm
Sub Micron smallest feature size - bar width 0.00078mm [0.78µm]
| Pattern | Cat# | Description | Qty | Price | |
| R75N | 68098-04 | USAF Test Chart, negative image, | each | 1100.00 | Add to Cart |
PS75P Slide Format, High Resolution
Positive Image
Key Features
USAF Test Chart Group 2 to group 9, element 3
Microscope Slide format
Sub micron minimum feature size
Description
High Resolution Positive Image
Soda Lime glass mounted in Stainless Steel Microscope Slide
Engraved with unique serial number for traceability (75mm x 26mm)
Supplied in Polished Wooden Box
Sub Micron smallest feature size - bar width 0.00078mm [0.78µm]
| Pattern | Cat# | Description | Qty | Price | |
| PS75P | 68098-05 | USAF Test Chart, positive image, | each | 950.00 | Add to Cart |
PS75N Slide Format, High Resolution
Negative Image
Key Features
USAF Test Chart Group 2 to group 9, element 3
Microscope Slide format
Sub micron minimum feature size
Description
High Resolution Negative Image
Soda Lime glass mounted in Stainless Steel Microscope Slide
Engraved with unique serial number for traceability (75mm x 26mm)
Supplied in Polished Wooden Box
Sub Micron smallest feature size - bar width 0.00078mm
Thermal Imaging
This is a metal foil version of the USAF test chart giving clear, negative type, high contrast patterns in groups -2 to 4. The absence of a glass support substrate removes the problems of masking infrared regions. Foil is double plated to increase rigidity.
| Pattern | Cat# | Description | Qty | Price | |
| PS75N | 68098-06 | USAF Test Chart, positive image, | each | 950.00 | Add to Cart |
R74, Thermal Imaging Test Chart
Key Features
Group -2 to Group 4, element 6
Description
Copper Foil version of a USAF Test Chart
Foil size 100mm x 100mm, blackened on one side
Optical Resolution Charts, Ronchi Rulings and Grids
| Pattern | Cat# | Description | Qty | Price | |
| R74 | 68098-07 | Thermal Imaging USAF Pattern | each | 190.00 | Add to Cart |
Star Test Target:
1. R65 Star Test Target
Key Features
Siemens Star or Sunburst Pattern 36 Sectors 10 degree pitch
Description
Pattern R65
Sector pitch 10º
Number of sectors 36
Outside diameter of image 25mm
Unresolved centre core 0.2mm
Normal substrate B270 Glass
Overall size 50mm x 50mm
Image type Vacuum deposited chrome
2. R66 Star Test Target
Key Features
Siemens Star or Sunburst Pattern 72 Sectors 5 degree pitch
Description
Pattern R66
Sector pitch 5º
Number of sectors 72
Outside diameter of image 25mm
Unresolved centre core 0.4mm
Normal substrate B270 Glass
Overall size 50mm x 50mm
Image type Vacuum deposited chrome
| Pattern | Cat# | Description | Qty | Price | |
| R65 | 68098-08 | Star Test Chart Sector Pitch 5 | each | 190.00 | Add to Cart |
| R66 | 68098-09 | Star Test Chart Sector Pitch 5 | each | 190.00 | Add to Cart |
NBS 25 Resolution Chart:
R60 NBS 25 Test Chart:
Key Features
3-30 Lines per mm Chrome surface image B270 Glass 50mm x 50mm
Description
A series of gratings diminishing in size as they go towards the central target. Lines range from 3 lines per mm to 20 lines per mm. Supplied as a positive high contrast chrome image on glass substrate 50mm x 50mm.
Also available in low contrast and negative form.
| Pattern | Cat# | Description | Qty | Price | |
| R60 | 68098-10 | NBS 25 Chart 20 Lines per mm | each | 220.00 | Add to Cart |
NBS5 Bar Test (BS4657):
Key Features
1-18 lines per mm Chrome Surface Image B270 Glass 75mm x 75mm
Description
This consists of elements of 5 bars ranging from 1 line per mm to 18 lines per mm, with adjacent numbers indicating the number of lines per mm. Produced as a vacuum deposited chrome image on 75mm x 75mm glass.
| Pattern | Cat# | Description | Qty | Price | |
| R67 | 68098-11 | NBS 5 Bar Test Ref 1963A BS 4657 | each | 210.00 | Add to Cart |
| R1 | 68098-20 | Grid with line pitch of 2mm | each | 210.00 | Add to Cart |
| R2 | 68098-21 | Grid with line pitch of 1mm | each | 215.00 | Add to Cart |
Grids:
Consists of elements of 5 bars ranging from 1 line per mm to 18 lines per mm, with adjacent numbers indicating the number of lines per mm. Produced as a vacuum deposited chrome image on 75mm x 75mm glass.
| Pattern | Cat# | Description | Qty | Price | |
| R1 | 68098-20 | Grid with line pitch of 2mm | each | 210.00 | Add to Cart |
| R2 | 68098-21 | Grid with line pitch of 1mm | each | 215.00 | Add to Cart |
| R3 | 68098-22 | Grid with line pitch of 0.5mm | each | 215.00 | Add to Cart |
| R4 | 68098-23 | Grid with line pitch of 0.25mm | each | 215.00 | Add to Cart |
| R10 | 68098-24 | Grid with line pitch of 0.1mm | each | 215.00 | Add to Cart |
This is R28 only
R12 pattern
Gratings-Ronchi Rulings
Metallic grating pattern on glass squares with opaque lines approximately 50% of the pitch. Stock items are on 50mm x 50mm squares of glass 1.5mm thick. The grating covers the entire plate with the exception of R25, R26 and R27 where the grating occupies a 30mm wide central strip. The glass is B270 with refractive index of 1.52.
Uses:
- Paired as light gates.
- Demonstrate interference patterns.
- Produce optical gradients.
Mutually perpendicular pairs produce a screen of square apertures.
Vacuum deposited chrome gratings on glass substrate. Typically used for testing of resolution, field distortion and parfocal stability, but may be paired to provide interference patterns (fringe patterns) and as light gates.
| Pattern | Cat# | Grating – Ronchi | Description | Qty | Price | |
| R12 | 68098-25 | 2 lines per mm |
50mm x 50mm B270 glass 1.5mm thick, ruled over full area |
each | 295.00 | Add to Cart |
| R15 | 68098-26 | 8 lines per mm |
50mm x 50mm B270 glass 1.5mm thick, ruled over full area |
each | 295.00 | Add to Cart |
| R16 | 68098-27 | 20 lines per mm |
.50mm x 50mm B270 glass 1.5mm thick, ruled over full area |
each | 295.00 | Add to Cart |
| R17 | 68098-28 | 40 lines per mm |
50mm x 50mm B270 glass 1.5mm thick, ruled over full area |
each | 295.00 | Add to Cart |
| R25 | 68098-29 | 50 lines per mm |
50mm x 50mm B270 glass 1.5mm thick, ruled over 30mm wide central strip |
each | 400.00 | Add to Cart |
| R26 | 68098-30 | 100 lines per mm |
50mm x 50mm B270 glass 1.5mm thick, ruled over 30mm wide central strip |
each | 400.00 | Add to Cart |
| R27 | 68098-31 | 125 lines per mm |
50mm x 50mm B270 glass 1.5mm thick, ruled over 30mm wide central strip |
each | 400.00 | Add to Cart |
| R28 | 68098-32 | 200 lines per mm |
26mm x 10mm soda lime glass grating | each | 425.00 | Add to Cart |
