polar

A clear fibre viewed under polarised light 

TECHNOLOGY FOR THE ANALYSIS OF TRACE EVIDENCE

 

Polarised Light Microscopy

 

Optical microscopy uses polarised light to analyse the birefringent properties of materials, aiding in the identification of fibres, chemicals, rocks and minerals.

When a birefringent sample is observed under polarised light a retardation of colour can be observed. Accurate determination of the retardation colour together with knowledge of the exact thickness of a sample can be used to identify the sample using a Michel Levy interfrence colour chart.

The ffTA polarised light module consists of a pair of polarisers, a retardation plate, and a 360-degree circular rotating specimen stage with Vernier scales enabling birefringence to be measured to an accuracy of 0.1 degree.

 

POLARISED LIGHT MICROSCOPY CAN BE PERFORMED WITH THE FOLLOWING PRODUCTS

ffTA multi-examination system for the analysis of trace evidence