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1.INTRODUCTIONWith the development the rise of advanced equipment, optical manufacturing technology requirements are becoming higher and constantly breaking through the limit. Optical fabrication is no longer simply the two processes of grinding, polishing. However, the optical system in the scientific research and production largely relies on the form of external processing, installation and adjustment. It makes more difficult for students to have a comprehensive understanding of optical manufacturing technology. In this paper, we propose a trial of using micro-course video for the teaching and communication in a senior grade Optical Manufacturing Technology Course (OMTC). 2.INTRODUCTION TO OPTICAL MANUFACTURING TECHNOLOGY COURSE2.1Course objectiveOMTC, 16 class hours, is a professional basic course for the junior students in School of Optics and Photonics, Beijing Institute of Technology. OMTC build the perceptual knowledge framework on processing, testing, installing and adjusting technology in optical manufacturing for undergraduate students. And it is highly practical, rich in content, and updated rapidly with the development of instruments and equipment. Through the study of OMTC, students can form a comprehensive understanding of modern optical manufacturing system and advanced manufacturing technology, which may broaden the horizon of undergraduates majoring in optical information science and technology, measurement and fabrication technology and instruments [1-4]. 2.2Course contentOMTC is conducted by relying on the optical workshop of the college, and it is mainly guided by experienced technicians, including the following practical contents:
In the famous international optical college, for example, the College of Optical Sciences at the University of Arizona, OMTC enables the undergraduates to learn about the processes of fabrication, testing, and alignment technology from the most traditional to the most advanced by allowing students to practical operate, or observe. Optical fabrication includes the original two-plane hand grinding, the traditional grinding machine, polishing machine, watching the most advanced stress plate polishing, Computer Controlled Optical Surfacing, Magnetorheological Finishing and Ion Beam Figuring technology. Optical measurement includes the knife-edge test, Hartmann test, Newton interferometer, Shack-Hartmann wave-front sensing technology, the commercial laser digital interferometer, anti-vibration interferometer and the CGH compensator. Optical alignment equipment includes laser tracker, auto-collimator, self-collimating microscope (PSM) and three-coordinate measuring machine. Over the years, the traditional optical institute in China, for example, School of Optoelectronic Engineering in Changchun University of Science and Technology, has been insisting on systematically teaching and practicing the course of Optical Technology. They also purchased the distance learning class of the College of Optical Sciences in University of Arizona. Also, under the closely cooperation of Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, they organized students to visit and learn the new generation optical manufacturing technology. Students’ horizon determines their ways of thinking. The more optical manufacturing methods they know, the more reasonable optical system structure and processing methods they can choose. Engineers who understand not only advanced technology but also conventional processing level and process cost are high-tech talents today. 2.3Feature and problem of OMTCAt present, the main problems of OMTC focus on two aspects:
3.APPLICATION OF MICRO-COURSE VIDEO TEACHINGTeachers, engaged in the field of optical manufacturing technology and scientific research, need to join the reform of OMTC. It is necessary for them to collect the historical technology, conventional technology and modern technology in various fields to present a systematic and comprehensive optical manufacturing and measuring status to students. This is for training optical students to broaden their view and lay a solid technical foundation. Teachers should enrich the class forms from a single hands-on operation to a set of operations, demonstration experiments and the deep integration of information technology and teaching content of mooc, micro-class and flipped class operation technology. 3.1Development of optical component processing technologyWe set up a sphere experiment of hand polishing to encourage students to understand the material removal mechanism and have a perceptual understanding of the removal efficiency. We also set up micro-course video teaching about optical element processing technology, mainly displayed and introduced 4m~8m aperture mirror fabrication techniques, common optical element fabrication technology, optical polishing process, single point diamond turning technology, hand polishing technology, Ion Beam Figuring technology, Magnetorheological Finishing technology, stress plate polishing technology, etc. 3.2Optical component testing technology and its progressWe set up laser interferometer surface test and white light profiler for surface roughness measurement demonstration experiment. We also set up the discussion classes about optical element test technology, mainly introduced the optical drawings technical requirements and corresponding test methods, surface shape measurement technology of knife edge method, Hartmann test, fringe reflectiong test, three-dimensional machine surface shape parameters testing technology, laser tracker surface shape parameters testing technology, anti-vibration interference measuring technology, null-compensator for aspherical measurement, CGH null-compensator for free-form surface measurement, etc. 3.3Advanced optical mounting and alignment technologyWe set up micro-course video teaching about advanced optical mounting and alignment technology, mainly introduced the lens centering process, automatic centering principle and operation, optical system mounting and alignment under the monitoring of interferometer, computer-aided alignment, etc. 3.4Application of laser processing in the fields of industry and medicaWe set up micro-course video teaching about the application of laser processing in the fields of industry and medical, mainly introduced the application of high-power laser cutting technique in automobile industry and the laser in medical field, such as excimer laser in situ keratoplasty (LASIK). The new course content and teaching method of application of micro-course video teaching have the following innovations: (1) In terms of teaching content, we systematically narrated the history, current situation and development direction of relevant fabrication, testing and alignment technologies in optical manufacturing technology; The application examples of advanced laser processing technology in industrial production and medical field were presented. (2) In terms of teaching method, we adopted the classroom form of integrated application of micro-class and operation technology of flipped classroom under the trend of deep integration of hands-on operation, demonstration experiment and information technology. 4.FEEDBACK AND DISCUSSIONAfter the first trial for a semester, we did an investigation to check the feedback of the students towards the new communication method. The related questions are listed in Table 1. Table 1.Questionnaire for the micro-course video based teaching and learning
We distributed 200 questionnaires and received 164 effective feedbacks. The results are plotted in Fig. 1. Figure 1.Feedback of the students’ attitudes towards the application of micro-course video teaching. (a) is their attitudes and (b) is the reason for holding positive attitudes.  From Fig. 1(a), we can see that 82% of the students held positive attitudes to the novel teaching method. Some of the students even expressed that if the application of micro-course video teaching were introduced earlier, he could learn this course much better! That is the best feedback for us. From Fig. 1(b) we know that the trial can help students in understanding the course better. Neutral and Negative attitudes are below 10%. The rest of them raised questions or suggestions in the “Others” option. 5.CONCLUSIONIn this paper, we introduced our first trial of introducing application of micro-course video teaching into the course of optical manufacturing technology, a comprehensive professional course for senior students. We received instant feedback from students. Investigation showed that 82% of the students enjoyed this micro-course video teaching, acknowledging that it helps to better understanding modern optical fabrication and testing equipment, expand students’ knowledge, and increase students’ advantages in employment competition. We still have many problems to be solved and we will figure out new approaches for next trial. We believe that teaching and learning with micro-course video teaching is the development trend and will make more contribute to this area. REFERENCESYa Zhou, Yao Hu, Liquan Dong, Yuejin Zhao, Yong Song, Qun Hao,
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