There have been continuous efforts on automating welding processes. This automation process could he said to fall into two categories, weld seam tracking and weld quality evaluation. Recently, the attempts to achieve these two functions simultaneously arc on the increase. For the study presented in this paper, a vision sensor is made, a vision system is constructed and using this, the 3 dimensional geometry of the head is measured on-line. For the application as in welding, which is the characteristic of nonlinear process, a fuzzy controller is designed. And with this, an adaptive control system is proposed which acquires the bead height and the coordinates of the point on the bead along the horizontal fillet joint, performs seam tracking with those data, and also at the same time, controls the bead geometry to a uniform shape. A communication system, which enables the communication with the industrial robot, is designed to control the bead geometry and to track the weld seam. Experiments are made with varied offset angles from the pre-taught weld path, and they showed the adaptive system works favorable results.

The sensors currently installed for bridge monitoring are faced with limitations in terms of the application and effectiveness of such systems in current long sized bridges, which are developing rapidly in terms of both size and function. Global Navigation Satellite System (GNSS) has been noted as an only way to overcome the limitations of such sensors. This is because they have numerous desirable characteristics that outweigh their high cost. However, GNSS installed for bridge monitoring has been used so far only in measurement of bridge displacement. Therefore, in this study, verify the usability of GNSS through correlation analysis between deflection and temperature

황섬유의 최저손실 파장영역인 1.55μm에서 고출력으로 안정하게 농작하는 광센서용 광원인 반도체 레이저를 제작하기 위하여 이론적인 해석을 수행한 후 제작하였다. 활성영역과 SCH층의 재료는 Ln1-xGaxAsyP1-y를 사용하였다. 광센서용 광원으로 사용되기 위해서는 넓은 스펙트럼 폭을 가지며, 가간섭 길이가 짧은 특성을 가지는 조건을 만족해야 한다. 따라서, 반도체 레이저에서 레이징을 억제시켜 줌으로써 넓은 스펙트럼 폭을 가지도록 설계를 하였고, 광섬유와 결합효율을 높일 수 있도록 tapered 형태의 스트라입 구조를 채택하여 마스크 패턴을 형성하였다. 또한, 레이징을 억제하기 위하여 후면에 윈도우 영역을 두었고, 측방향으로 경사각을 두어 반사도를 낮추도록 설계 및 제작하였다. 7도와 15도의 측면 경사각을 가지는 구조와 굽은 스트라입 구조를 가지는 소자를 제작하여 특성을 측정한 결과, 광센서용 광원으로서 적용이 가능한 광출력 특성과 넓은 스펙트럼 폭을 가졌다.