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Electron Microscopy Sciences

Illuminators, Magnifiers, Microscopes, & Graticles

arrow14Optical 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 Chartarrow12 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 202.00 Add to Cart
arrow12 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 202.00 Add to Cart
arrow12 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 1180.00 Add to Cart
arrow12 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 1180.00 Add to Cart
arrow12 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 1000.00 Add to Cart
arrow12 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 1000.00 Add to Cart

Star Test Target:arrow12Star Test Target:

arrow121. R65 Star Test Target
Key Features
  • Siemens Star or Sunburst Pattern 36 Sectors 10 degree pitch
Description
  • Pattern R65
  • Sector pitch 10°
  • 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
arrow122. R66 Star Test Target
Key Features
  • Siemens Star or Sunburst Pattern 72 Sectors 5 degree pitch
Description
  • Pattern R66
  • Sector pitch 5°
  • 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 192.00 Add to Cart
R66 68098-09 Star Test Chart Sector Pitch 5 each 202.00 Add to Cart

NBS 25 Test Chart:arrow12NBS 25 Resolution 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 236.00 Add to Cart

NBS5 Bar Test (BS4657) arrow12NBS 5 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 220.00 Add to Cart

Grids:arrow12Grids:

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 220.00 Add to Cart
R2 68098-21  Grid with line pitch of 1mm  each 222.00 Add to Cart
R3 68098-22  Grid with line pitch of 0.5mm  each 222.00 Add to Cart
R4 68098-23  Grid with line pitch of 0.25mm  each 222.00 Add to Cart
R10 68098-24  Grid with line pitch of 0.1mm  each 222.00 Add to Cart

This is R28 only


R12 pattern


arrow12 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 310.00 Add to Cart
R15 68098-26  8 lines
per mm
50mm x 50mm B270 glass
1.5mm thick, ruled over full area 
each 310.00 Add to Cart
R16 68098-27  20 lines
per mm
.50mm x 50mm B270 glass
1.5mm thick, ruled over full area
each 310.00 Add to Cart
R17 68098-28  40 lines
per mm
50mm x 50mm B270 glass
1.5mm thick, ruled over full area
each 310.00 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 420.00 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 420.00 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 420.00 Add to Cart
R28 68098-32  200 lines
per mm
26mm x 10mm soda lime glass grating  each 440.00 Add to Cart

Counting Chambers arrow12arrow12