Application of real time phase shift interferometer to the measurement of concentration field

• Published in: Journal of crystal growth Vol. 129; no. 3-4; pp. 706 - 718
• Main Authors: Onuma, Kazuo, Tsukamoto, Katsuo, Nakadate, Suezou
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.04.1993; Elsevier
• Subjects: Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Methods of crystal growth; physics of crystal growth; Physics; Theory and models of crystal growth; physics of crystal growth, crystal morphology and orientation; Crystal growth; Two dimensional space; Phase shifting interferometry; Supersaturation; Three dimensional space; Experimental study; Real time; Inverse crystal growth; Optical method; Chemical concentration; Measurement method; Growth from solution; Concentration distribution
• ISSN: 0022-0248; 1873-5002
• DOI: 10.1016/0022-0248(93)90507-S

A real time phase shift interferometer developed by Nakadate is applied to the measurement of the concentration distribution around a growing or dissolving crystal. Use of the polarized light interferometer allowed either a grey level picture depending on a two-dimensional phase distribution or a three-dimensional perspective profile of the concentration field to be displayed on a TV monitor in real time. The sensitivity of the interferometer is increased at least by a factor of 20 to 30 compared with the conventional two-beam interferometer. The time resolution was also improved so that succesive phase distribution could be obtained at the time resolution of 1/60 s. Using the Abel transformation method, a quasi-three-dimensional concentration profile of a sodium chlorate crystal was calculated, which made it possible to measure the actual surface concentration.