Speckle Pattern Application Kit

The Speckle Pattern Application Kit for the easy and fast production of a perfect speckle pattern for your DIC application!

The cor­re­la­ted solu­ti­ons speck­le com­pon­ents pro­vi­de the pro­duc­tion of ide­al speck­le pat­tern which is important for good signa­tures throughout the area of inte­rest so that con­sis­tent sized sub­sets may be tra­cked with certainty

 

 

Characteristics and advantages:

  • High con­trast, quick pre­pa­ra­ti­on
  • Pre­cisi­on: Opti­mi­sed and con­sis­tent dot sizes
  • 50 % coverage: equal amount of black and white
  • Ran­dom: Per­fect mix­tu­re bet­ween irre­gu­lar and regu­lar pattern
  • Result: impro­ved hig­her spa­ti­al reso­lu­ti­on due to opti­mi­sed sub­set size and high­ly redu­ced noise

 

Why a good speck­le pat­ter is required?

In DIC, a mesh of small sub­sets of the image are tra­cked as the spe­ci­men moves and deforms. To per­form this tracking, the sub­sets are shifted until the pat­tern in the defor­med image matches the refe­rence image as clo­se­ly as pos­si­ble; this match is cal­cu­la­ted by the total dif­fe­rence in grey levels at each point. A good pat­tern will allow the cor­re­la­ti­on to be made with high con­fi­dence and pro­du­ce low noi­se. The examp­le below shows the uncer­tain­ty for the out of pla­ne mea­su­re­ment data in Z‑direction with dif­fe­rent speck­le patterns.

 

 

In order to pro­vi­de con­sis­tent speck­le pat­terns for various sam­ple sizes and mate­ri­als, the speck­le kit inclu­des:

 

Stamp Rol­lers (6 sizes):

  • 0,18mm dot size for 53 – 145mm FOV*
  • 0,33mm dot size for 102 – 296mm FOV*
  • 0,66mm dot size for 203 – 539mm FOV*
  • 1,27mm dot size for 389 – 826mm FOV*
  • 2,45mm dot size for 762 – 2032 mm FOV*
  • 5,08mm dot size for 1524 – 4064 mm FOV*

Flat Stamp Rockers 146 x 146mm (6 sizes)

  • 0,18mm dot size for 53 – 145mm FOV*
  • 0,33mm dot size for 102 – 296mm FOV*
  • 0,66mm dot size for 203 – 539mm FOV*
  • 1,27mm dot size for 389 – 826mm FOV*
  • 2,45mm dot size for 762 – 2032 mm FOV*
  • 5,08mm dot size for 1524 – 4064 mm FOV*
  • Rocker for Flat Stamps

Access­ories:

  • extra ink
  • ink pad
  • hard pad­ded car­ry­ing case

 

* recom­men­ded FOV (image width) for stan­dard 5Mpx sen­sor with 2500x2000px. Alter­na­tively check dot size, which should be mini­mum about 3x3px.

 

For fur­ther infor­ma­ti­on, a quo­ta­ti­on or in case of any ques­ti­ons, plea­se don’t hesi­ta­te to con­ta­ct us via info@isi-sys.com