Calibration Plates

Material and Processing

All calibration targets of outer size 160x160mm and smaller are screen printed ceramic substrates of nominal thickness 1mm. Larger calibration targets consist of aluminum composite material of 3mm thickness. For all types the printing process is conducted with high-precision screens at room temperature without per-piece print calibrations or measurements. We therefore cannot provide any hard guarantees on the accuracy, but the following sections will outline what printing accuracy can be expected in general.

Dimensions

In the below images the dimensions of the calibration targets are given. The parameter \(s\) describes the grid spacing of the corresponding pattern.

Halcon Pattern

halcon_dim

Ensenso Pattern

ensenso_dim

Specifications

The position of the print is not aligned to the substrate.

Ceramic Calibration Targets

  • Accuracy of barycenters of dot grid

    • Relative deviation of distances of neighboring points: ≤ 0.1e-3

    • Absolute deviation of grid spacing: ≤ 1e-3

  • Thermal expansion: ~ 8e-6/K

  • Outer dimension tolerance: ±0.25mm

  • Thickness tolerance: ±0.1mm

Aluminum Calibration Targets

  • Accuracy of barycenters of dot grid

    o Relative deviation of distances of neighboring points: ≤ 0.1e-3 o Absolute deviation of grid spacing: ≤ 1e-3

    • Thermal expansion: ~ 24e-6/K

    • Outer dimension tolerance: ±0.5mm

    • Thickness tolerance: ±0.2mm

Note

Thermal expansion is provided for reference only and is usually irrelevant in practical applications.