The focus of the OSeeT are enteric coatings (EC) and modified-release (MR) coatings.

 

The characteristics of the coating layer are revealed via OSeeT:

Mean coating thickness
→  progress of coating process

Intra-particle and inter-particle coating variability
→  for quality and homogeneity of the applied coating

Roughness
→  optical quality of the surface

The Technology behind OSeeT is Interferometry

• OCT is based on white light interferometry:
  – broad bandwidth resulting in low-coherence length
  – defines the axial (=depth) resolution
• Light is split into a reference and a probe path
• Optics of sample arm focus light and define lateral (=surface) resolution
• Interference of light reflected back from both paths
• Spectrometer (grating, CCD line scan camera)
• Depth-information is generated from interference fringes by Fourier-transformation (FFT)
• Measurement of a single depth scan

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