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Drug tablet thickness estimations using air-coupled acoustics.

Ilgaz Akseli1, Cetin Cetinkaya

  • 1Department of Mechanical and Aeronautical Engineering, Center for Advanced Materials Processing, Wallace H. Coulter School of Engineering, Clarkson University, Potsdam, NY 13699-5725, USA.

International Journal of Pharmaceutics
|November 21, 2007
PubMed
Summary

This study introduces a non-contact acoustic method to predict drug tablet coating thickness. This technique ensures pharmaceutical quality by accurately measuring coating variations without damaging the tablet.

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Area of Science:

  • Pharmaceutical engineering
  • Acoustic metrology
  • Non-destructive testing

Background:

  • Tablet coating quality is crucial for effective drug delivery and pharmaceutical quality assurance.
  • Variations in tablet coating thickness can indicate process issues.
  • Existing methods for measuring coating thickness may be contact-based or destructive.

Purpose of the Study:

  • To present a novel non-contact and non-destructive acoustic technique for predicting drug tablet coating layer thickness.
  • To develop a system utilizing air-coupled excitation and laser interferometric detection.
  • To enable accurate quality assurance of pharmaceutical tablet coatings.

Main Methods:

  • Utilizing an air-coupled transducer to vibrate drug tablets at high frequencies, exciting various vibrational modes.
  • Employing laser interferometry to capture non-contact surface vibrational responses at multiple points.
  • Developing an iterative computational procedure based on the Finite Element (FE) method and Newton's method to extract coating thickness.

Main Results:

  • Successfully demonstrated the extraction of coating layer thicknesses from measured resonance frequencies.
  • Validated the non-contact acoustic technique's capability in predicting coating thickness.
  • Showcased the potential for real-time quality control in pharmaceutical manufacturing.

Conclusions:

  • The developed non-contact acoustic technique offers a viable solution for predicting drug tablet coating thickness.
  • This method enhances pharmaceutical quality assurance by providing non-destructive and accurate measurements.
  • The air-coupled excitation and laser detection system represents a significant advancement in tablet coating metrology.