This paper describes a new, simple method for obtaining the output- and frequency-stabilized single mode output of an internal-mirror He–Ne laser (λ=633 nm). The total back-beam intensity is detected with a silicon photodiode and the photodiode current is converted into a voltage signal. A voltage proportional to the difference between the voltage signal and a stable dc reference voltage is applied to a laser discharge current regulation circuit which controls the change in the laser tube length due to thermal contraction. As a result, the laser output power and frequency are stabilized at the same time. A relative output stability of ±0.12% and a relative frequency stability of ±4×10-9 were obtained over a period of 10 minutes or longer.
have introduced a Project ・ Based Learning ( PBL )with Micro lntelligent Robot System ' LMIRS " into the curriculum fbr the education of system development process . We are intended to provide a place of learning " process of system developmentl , and " making education as a creative education 鬮 ' through the development ofrobot 」 n 2009, a new robot platform , whichis provided for students at the beginning of this PBL program, was developed in order to improve the technical factors Qf robQt system , and at the same time , increase students ' motivation fc ) r iearning . In this paper , we reported practice of PBL Program developing MIRS in 2011and the efforts ofthree years. A fUrther improvement of student attitudes and motivation for making things up will be an issue in the future . Key Mords: System development education . Micro lntelligent Robot system , PBL Program t. 緒 言
have introduced a Project-Based Learning (PBL) with Micro Intelligent Robot System "MIRS" into the curriculum for the education of system development process. We are intended to provide a place of learning "process of system development" and "making education as a creative education" through the development of robot. In 2009, a new robot platform, which is provided for students at the beginning of this PBL program, was developed in order to improve the technical factors of robot system, and at the same time, increase students' motivation for learning. In this paper, we reported practice of PBL Program developing MIRS in 2012 and the efforts of four years. A further improvement of student attitudes and motivation for making things up will be an issue in the future.
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