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Electron Microscopy Sciences

Illuminators, Magnifiers, Microscopes, & Graticles

Downloadable PDFarrow14Optical 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 – please see ref S84 in stage micrometers.

R70 USAF 1951 Test Chartarrow12R70 USAF 1951 Test Chart

Groups 0 to 7

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 0.78 microns (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 202.00 Add to Cart

R71 USAF Test Chartarrow12R71 USAF Test Chart

Group -2 to Group 7, Element 6

Large Positive Image
B270 glass, size 75mm x 75mm

Pattern Cat # Description Qty Price  
R71 68098-02 USAF Test Chart Groups -2 to 7 each 225.00 Add to Cart

R75P High Resolution Positive Imagearrow12R75P High Resolution Positive Image

USAF Test Chart Group 0 to Group 9, Element 3

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 1,200.00 Add to Cart

R75N High Resolution Negative Imagearrow12R75N High Resolution Negative Image

USAF Test Chart Group 0 to Group 9, Element 3

Sub Micron smallest feature size – bar width 0.00078mm [0.78µm]
High Resolution Negative Image
Soda Lime Glass 50mm x 50mm x 2mm

Pattern Cat # Description Qty Price  
R75N 68098-04 USAF Test Chart, Negative Image, Groups 0/1 to 9/3 each 1,200.00 Add to Cart

PS75P Slide Format, High Resolution Positive Imagearrow12PS75P High Resolution Positive Image

USAF Test Chart Groups 2 to 9, Element 3

Sub Micron smallest feature size - bar width 0.00078mm [0.78µm]
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

Pattern Cat # Description Qty Price  
PS75P 68098-05 USAF Test Chart, Positive Image, Groups 2/1 to 9/3 each 1,050.00 Add to Cart

PS75N Slide Format, High Resolution Negative Imagearrow12PS75N High Resolution Negative Image

USAF Test Chart Groups 2 to 9, Element 3

Sub Micron smallest feature size - bar width 0.00078mm
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

Pattern Cat # Description Qty Price  
PS75N 68098-06 USAF Test Chart, Negative Image, Groups 2/1 to 9/3 each 1,050.00 Add to Cart

Star Test TargetStar Test Targetarrow12Star Test Targets

 

 

 

 

 

Specifications

  R65 R66
Sector Pitch 10°
Number of Sectors 36 72
Unresolved Center Core 0.2mm 0.4mm
Outside Diameter of Image 25mm 25mm
Normal Substrate B270 Glass B270 Glass
Overall Size 50 x 50mm 50 x 50mm
Image Type Vacuum deposited chrome Vacuum deposited chrome

Ordering

Pattern Cat # Description Qty Price  
R65 68098-08 Star Test Chart Sector Pitch 10 each 194.00 Add to Cart
R66 68098-09 Star Test Chart Sector Pitch 5 each 204.00 Add to Cart

arrow12NBS 25 Resolution Charts

R60 NBS 25 Test Chartarrow12R60 NBS 25 Test Chart

3-30 Lines per mm Chrome surface image B270 Glass 50mm x 50mm

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 238.00 Add to Cart
NBS5 Bar Test (BS4657)arrow12NBS 5 Bar Test (BS4657)

1-18 lines per mm Chrome Surface Image B270 Glass 75mm x 75mm

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, Chrome on Glass each 220.00 Add to Cart
R72 Sayce Logarithmic Test Chartarrow12R72 Sayce Logarithmic Test Chart

This chart is a photographic image featuring 90 lines and spaces of gradually decreasing width in logarithmic series. The charts have a base length of 100mm and are supplied on 0.175mm thick ester-based film. Typically in use, the image is examined to determine the finest detail that can be distinguished. The finest resolved line is then counted to define the resolution of the device. Includes 6 charts, resolution table and for use.

Pattern Cat # Description Qty Price  
R72 68098-12 Sayce Logarithmic Test Chart each 200.00 Add to Cart

Gridsarrow12Grids

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 226.00 Add to Cart
R2 68098-21 Grid with line pitch of 1mm each 226.00 Add to Cart
R3 68098-22 Grid with line pitch of 0.5mm each 226.00 Add to Cart
R4 68098-23 Grid with line pitch of 0.25mm each 226.00 Add to Cart
R10 68098-24 Grid with line pitch of 0.1mm each 226.00 Add to Cart

Gratings-Ronchi Rulingsarrow12Gratings-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 314.00 Add to Cart
R15 68098-26 8 lines
per mm
50mm x 50mm B270 glass
1.5mm thick, ruled over full area
each 314.00 Add to Cart
R16 68098-27 20 lines
per mm
.50mm x 50mm B270 glass
1.5mm thick, ruled over full area
each 314.00 Add to Cart
R17 68098-28 40 lines
per mm
50mm x 50mm B270 glass
1.5mm thick, ruled over full area
each 314.00 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 426.00 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 426.00 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 426.00 Add to Cart
R28 68098-32 200 lines
per mm
26mm x 10mm soda lime glass grating each 442.00 Add to Cart

Counting Chambers arrow12arrow12