Research On Highly-Precise Photoelectricity Auto-Collimator Based On The Embedded Android

Based on the optics auto-collimation, auto collimator is a highly-precise measuring equipment used for small-angle measurement. It has been extensively applied in various fields including aerospace, shipping, and war industry which all require definite accuracy in operation. There are some other industries embraced such as mechanic processing, metrological verification, Prism angle positioning and monitoring, optical element test, installing precision controlling and so on. However, structure of traditional photoelectricity auto collimation inevitably brings its disadvantages in mobilization and intelligentization. New methods of designing should be proposed to better meet the needs of research and production. The introduction of embedded structure in the photoelectricity auto-collimation is practical and feasible, making it worthwhile of deep researching.In this research, a structure plan of digital photoelectricity auto collimation is proposed based on embedded photoelectricity auto-collimation of Android and combined w ith the theory of optical auto-collimation and embedded system. Meanwhile, we take advantage of whole system frame of Android and the ARM hardware platform with Cortex-A8CPU to carry out the developing of CMOS sensor and touch screen.Furthermore, we have a detailed research on the frequency spectrogram detected by CMOS under the condition and dim light and made an analysis of the feature of the noise. On the basis of it, a method of noise filtering, namely filtering-denosing in obstruction can be found. For promoting the measuring precision of the system, we researched on the method of light-spot’s sub-pixel positioning and came up w ith another one on the basis of present results. Besides, we have experimented on the combination of several w ays of filtering denosing in obstruction and positioning algorithm. With extra experiments on interference immunity, stability and test precision of those combinations, we can choose the best one. The above-mentioned algorithm and user interface can be complied by adopting JAVA language and Android system to accomplish the detailed design of photoelectricity auto-collimation and to have measuring experiment of it. After the position, the precision was set within0.2", which attest to the feasibility of the design plan.