ISI-SYS SPECKLE PATTERN APPLICATION KIT

SPECKLE PATTERN APPLICATION KIT

The Speckle Pattern Application Kit is for the easy and fast production of a perfect speckle pattern for your DIC application.
The correlated solutions speckle components provide the production of an ideal speckle pattern, which is important for good signatures throughout the area of interest, so that consistently 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 patterns.

Result: improved higher spatial resolution due to optimised subset size and highly reduced noise.

Why a good speckle pattern is required?

In DIC, a mesh of small subsets of the image is 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 below shows the uncertainty for the out-of-plane measurement data in the Z‑direction with different speckle patterns.

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*

Accessories:

• Extra ink
• Ink pad
• Hard padded carrying case

* recommended FOV (image width) for a standard 5 Mpx sensor with 2500x2000px.

Alternatively, check the dot size, which should be a minimum of about 3x3px.