265067 Measurement of Crystal Morphology: A New Method Based On Reflection of Light From Crystal Faces

Tuesday, October 30, 2012: 3:37 PM
Conference A (Omni )
Jayanta Chakraborty, Chemical Engineering, Indian Institute of Technology, Kharagpur, Kharagpur, India, Debasis Sarkar, Indian Institute of Technology, Kharagpur, Kharagpur, India and Abhishek Singh, Indian Institute of Technology, Kharagpur

Measurement of morphology of 3D faceted crystals: a new method on the basis of light reflection from faces.

Jayanta Chakraborty, Debasis Sarkar and Abhishek Singh

Department of Chemical Engineering, Indian Institute of Technology Kharagpur. Kharagpur, India.

Measurement of morphology of faceted crystals is a challenging task. Most of the examples of morphological measurements are applicable for flat crystals where image is taken from top and it is analyzed for edge detection. In this work we show how this simple strategy of image capture and analysis can be used to obtain the morphology of a 3D faceted crystal using our novel method of image capturing.

The main idea comes from the fact that the crystal faces being smooth, regular reflection of light dominates the irregular one. Hence a proper arrangement of optics will make one face shining where other faces will be dull.  One such picture is shown in Fig. 1a for CuSO4, 5H2O. This novel strategy makes image processing a trivial task and the face vertices can be detected readily. The vertex location, which is 2D information about a certain face can then be integrated with the angular orientation of faces (which is invariant for a given material and polymorph) to obtain the detail 3D morphology of the crystal. One example of such reconstruction is shown in Fig. 1b.

  :fig1.png :fig2.png

Figure 1: (a) The proposed illumination strategy has found a face. (b) The face features has been extracted using image analysis and the crystal is reconstructed using our software. The top view of the reconstructed crystal is shown.


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