Manufacturing Metrology Team
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Alicona G5 focus variation measuring instrument

Instrument's description

alicona
Alicona G5 with its Advanced Real-3D.
 

Working principle:

The Alicona G5 “Infinite Focus” is a focus variation measuring instrument. It vertically scans the object's surface and captures a stack of 2D microscope images. For each image, the sharpness of each pixel is calculated. Detection of the object's surface, for each pixel, is achieved by finding the corresponding z-location having the highest sharpness (equivalent to the best focus).

Advantages:

  • Wide applications: form and surface texture measurement
  • Relatively fast measuring time
  • Up to 5-axis measurement. Beneficial for complex geometries, e.g. micro-tool measurement
  • True colour of measured object's surface

Limitations:

  • Difficult to measure very smooth surfaces with Ra < 10 nm
  • Difficult to measure optical or transparent surfaces
 

Related research focus

Our current research related to the G5 instrument is:

  • Calibration of the ISO metrological characteristics based on focus-variation principle
  • Advanced methods of surface texture measurement and analysis
  • Calibration of the instrument's transfer function to improve measurement capability and accuracy
  • Performance verification of the instrument for geometrical metrology
  • Automatic inspection strategy for freeform surface by 5-axis measurement
  • Measurement uncertainty estimation

Instrument specifications

Objective's specifications
 Objectives details  Unit  2.5×  10× 20×  50× 100×
Lateral sampling distance  μm  3.25 1.76  0.88  0.44   0.18  0.09
Min. lateral resolution  μm 58.71  23.48  11.74   8.8 6.4   4.4
Min. Repeatability (vert.)  μm  6.92  3.49 1.75  0.88  0.64   0.44
Best vertical resolution   nm 2300  410  100  50  20  10 
Working distance   mm  8.8  23.5   17.5  13  10.1 3.5 
Field of view X  μm  5716 2858   1429  715 286  143 
Field of view Y  μm 4351  2175  1088  544  218  109 
Max. measurable height   mm  22 16   12  3.2
Step height accuracy   %  -  0.05 0.05   0.05 0.05   0.05
Min. measurable roughness (Ra  nm 7000   1200 300   150  60 30 
Min. measurable roughness (Sa  nm  3500 600   150 75   30 15 

Measurement examples

freeform2
Freeform geometric measurement. Size of the sample is (55×55×13) mm.
 
SprayCoating2
Surface texture measurement of cold-sprayed coated material.
 
 
SLS2
Surface texture measurement of SLS manufactured nylon part.
 
SLM2
Surface texture measurement of SLM manufactured metallic part.
 
 
GritBlasting
Surface texture measurement of grit-blasting coated material.
 
MicroFlankSurface
Surface texture measurement of micro-tool flank surface for wear assessment.
 
 

 

For contract measurement enquiries, please contact:

Matthew Hutchinson, Commercial Manager
Matthewjames.hutchinson@nottingham.ac.uk


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Manufacturing Metrology Team

Room B044 Advanced Manufacturing Building
Jubilee Campus
Wollaton Road
Nottingham, NG8 1BB



email:MMT@nottingham.ac.uk