| In the practical applications, the optical-axis parallelism influences theperformance and accuracy of the multiple optical-axis system and the parallelismmeasuring is essential to the production process. The traditional method aboutparallelism measuring is based on the laser paper. This method cannot give the valueof deviation angles among multiple optical-axis and the measuring procedure is easilyaffected by subjective factors. These disadvantages increase the system errors, reducethe degree of automation and waste a lot of manpower and resources. With thedevelopment of opto-electronics and image processing technology, the high accuracyand automation has become the improvement tendency.This paper has researched the principle and methods of parallelism measuring andimproved the image processing technology based on the hardware equipments aboutthe parallelism measuring system with the large-calibre off-axis concave parabolicmirror. The image processing technology increased the accuracy, automation and antijamming capabilities of the system. This paper also analyzed the system measurementability in details. The content of this paper is as follows:1. The whole solutions and the specified operational procedures about themultiple optical-axis parallelism measuring system were putted forward to satisfy thesystem requirement. The system chose the method based on the large-calibre off-axisconcave parabolic mirror to meet the measurement requirement. With the use ofopto-electronic technology and image processing, the system had a high precision, awide range of applications, improved automation and better anti jamming capabilities.2. The improved focusing evaluation technology and optimized procedures oflaser spot center localization were putted forward to increase the system accuracy andspeed. With the improvement of DCT focusing evaluation technology and theoptimized procedures about the least square ellipse fitting for spot center localization,the system measuring accuracy and anti jamming abilities were improved and theprocessing time was shortened as well as the automation was increased.3. The multiple optical-axis parallelism measuring system software was designedto improve the system automation. With the efficient, simple and robust software, thesystem could control the hardware equipment, do image processing and complete the deviation angles calculations with modules and multi-threads. The system softwareprovided the high automation and better anti-interference affected by subjectivefactors.4. Amultiple optical-axis system product was measured with this system to verifythe system validity. Based on the hardware equipments’ parameters, experimentresults and the errors from image processing technology, the system ability wasanalyzed in details with the measurement parameters, such as the measurement range,accuracy, relative errors, standard deviations and uncertainties. |
PDF Full Text Request