Probenlage

Probenlage, literally translated as sample position, is a term used in measurement and testing to describe the location, orientation, and mounting of a specimen within a measurement setup. It encompasses factors such as height relative to reference surfaces, tilt or angular orientation, lateral offset, and the stabilization of the sample to prevent movement during measurement. The concept focuses on where and how the sample is placed rather than how it is prepared.

The Probenlage is a critical parameter because small changes in position or orientation can influence measurement results, especially in methods that are sensitive to geometry, illumination, or detection efficiency. In optical and spectroscopic techniques, the angle and distance between the sample, light source, and detector can alter signal strength and spectral features. In X-ray diffraction or fluorescence, the tilting or standoff distance can affect peak intensities and geometrical correction factors. In microscopy or metallography, mounting orientation can determine which features are visible or measurable.

Standardized protocols often require explicit documentation of the Probenlage to ensure reproducibility and comparability of results. This includes reporting coordinates, tilt angles, distances, and mounting methods, as well as any fixtures used to stabilize the sample. Some methods specify fixed or controlled Probenlage conditions to minimize variability.

In practice, researchers and technicians should define and record the Probenlage as part of the measurement setup and report it alongside results. This facilitates traceability, repeatability, and accurate interpretation of data.