Foster + Freeman


ffTA glass refractive index measurement for trace evidence analysis




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  • Overview
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The ffTA grim system can be used to identify and group fragments of glass through the determination of a samples refractive index using the standard oil immersion/temperature variation technique. Using GRIM, repeat measurements produce results with a standard deviation of, typically, 0.00002RI over a 5 hour period and 0.00003RI over a 5 day period. The system can monitor up to four glass fragment edges per operation, speeding the casework examination process, giving improved statistical accuracy and reducing calibration time. Casework measurements are filed, password protected, with the essential information that identifies each fragment of glass examined, including for example its source, casework reference, and operator identity. Basic statistics are generated including average, range, spread and standard deviation. Results may be displayed as scatter diagrams and formatted for exportation to Microsoft Office for additional analysis.


  • Multiple edge measurements
  • Calibration
  • Enhanced casework documentation
  • High level of temperature stability and accuracy


See Brochure for full specifications FFTA – Pathtech Brochure 2013

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