Study Of Method To Measure Ethanol Concentration Based On Optical Fiber Digital Holography

Optical fiber is one of the most important invention and milestone for human being in age, which has many advantages. The combination of optical fiber and digital holography reduce the use of optical components in holographic technology. It not only makes the system built easier and more convenient, but also greatly improves the anti-interference ability and practicability of the system. It expands the applicable range of digital holography. Currently, the practical application based on the optical fiber digital holography has become a hot topic of research.In this paper, the basic theory of optical fiber and digital holography have been described and discussed. Several aspects that should be noted when the optical fiber is introduced into digital holography is analyzed. How to select a suitable optical fiber in digital holographic system is presented. The actual application of optical fiber digital holography will be further discussed in the paper.On this basis, the method of measuring ethanol concentration based on optical fiber digital holography is studied in the paper. The concentration of ethanol is measured out by using the diffusion differences of various concentrations of ethanol. In-depth analysis of the theoretical basis of this method is executed and the relationship between solution diffusion process and fringe of corresponding holographic interferogram is deduced.In the experiment, a large amount of experiments of ethanol solution from10degrees to50degrees (interval in10degree) are carried out. Through processing and analysis of the experimental results, the proposed method to measure solution concentration based on optical fiber digital holography interferometry is convenient and feasible.