Calibration Plates

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Single-sided Dual Plane Calibration Plate

The basis for accurate multi-dimensional strain experiments is a precise calibration of the two (or more) cameras. LaVision employs a fully empirical calibration method, which does not involve measuring physical angles or distances. It has been proven to be highly accurate and reliable.
For the calibration of stereoscopic camera systems LaVision provides Single-sided Dual Plane (SSDP) Calibration Plates with defined separation of the calibration planes and mark spacing.

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In contrast to widely used single-sided calibration targets movement of the plate through the volume or taking several views is typically not required. In the most cases taking a single image from the 0-plane position of the specimen is sufficient to calibrate the entire volume.
Features
  • high precision dot pattern
  • thickness tolerance less than ± 0.02 mm
  • tolerance of dot spacing (largest separation on one side) down to ± 0.02 mm
  • tolerance of level separation less than ± 0.01 mm
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Single-sided Single Plane (SSSP) Calibration Plate

The Single-sided Single Plane (SSSP) Calibration Plate is a widely used tool for calibrating 2D and 3D DIC setups. The calibration procedure when using this type of plate utilises several views of the plate at different positions and orientations within the depth of focus of the system. Marks are automatically detected, and all detected marks provide information which is used in the bundle adjustment calibration algorithm. During this live calibration procedure, the intrinsic and extrinsic camera parameters are calculated.

An additional feature of the plates are printed speckle patterns on the rear side, allowing the user to perform rigid body shift (0% strain) tests to quantify the uncertainty within the system.

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Features
  • suitable for calibration of 2D and 3D StrainMaster DIC systems
  • high precision dot pattern with three fiducials for orientation detection
  • lightweight and easy to handle
  • plates are provided with printed speckle pattern on the back side for 0 strain test according to VDI standard 2626