Primary Study Of A New Technique On Oil Monitoring Using Digital In-line Holography To Wear Particles Analysis

The effect of wear particles morphological analysis on prediction, diagnosis of machinery health is an important aspect in oil monitoring. However, the application of this form of analysis is characterized by the multitude of different analytical techniques that are available and this makes for difficulties in specifying the most suitable methods to use in any given situation. Although the equipment Laser Net Fines is an optical oil debris auto monitor which is designed to provide real time measurements of size distributions and shape characteristics of wear particles, but its optical system is based on the traditional optical imaging theories and can't get particles 3-dimensional image.Digital in-line holography with numerical reconstruction has been developed into a new tool, that routinely achieves both lateral and depth resolution, at least at the micron level, in three-dimensional imaging. The experimental and numerical procedures have been incorporated into a program package with a very fast reconstruction algorithm that is now capable of real-time reconstruction. This capability is demonstrated for diverse objects, such as suspension of microspheres and particles samples.Using in-line digital holographic 3-D imaging to wear particle morthological analysis, the dissertation provides a new technology on oil monitoring. The developed system has the following functions such as wear particles counting, morphology auto analysis, tribological failure prediction. The principle, the characters, and the hardwares, the softwares were presented. The experiments result proved the feasibility of such technology. At last, the following works and some key-issues were discussed. The contents of this dissertation mainly included the following:(1) Overview of oil monitoring technologies and some important theories of in-line digital holography used in particles detection.(2) Analysis and improvement of digital in-line holography used in wear particles detection in theories.(3) Setup of the system of digital in-line holography used in wear particles detection.(4) Primary improvement of the technology in experiments.(5) Conclusions and prospects. Because of the theories of in-line digital holography, the theories of oil monitoring and their applications involving, this dissertation has high value not only in theories but also in oil monitoring practice.