대한공업교육학회지

Korean Institute of Industrial Educations (대한공업교육학회)
권호 표지

Development of the Handy Non-contact Surface Roughness Measurement Device by using the Optical Fiber Sensor

광섬유센서에 의한 간이 비접촉 표면조도 측정기의 개발

  • Hong, Jun-Hee (Mechanical Engineering Department of Chugnam National University)
  • Received : 2009.07.30
  • Accepted : 2009.09.25
  • Published : 2009.12.31
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Abstract

The purpose of this study was to develop the handy non-contact measurement device of the surface roughness by using the optical fiber sensor. The advantages of fiber optic sensors are high-speed responsibility, non-effect of the magnetic, convenience of the product and high precision. The measurement theory for surface roughness of optical fiber sensor is one to one correspondence between the reflected light intensity based on the surface roughness of the object and the measurement value of previously known for surface roughness. The reflected light intensity was determined using the distance to the surface from the sensor probe and the limit reflection angle based on the surface roughness. Therefore, in this study, the sensor probe was produced for determining the value of surface roughness only using the limit reflection angle based on the surface roughness with the fixed distance from the surface. A prototype measurement system was composed of a transmitting part, a receiving part and a signal processing circuit. The materials of standard measurement which was used in this experiment were SM45C, STS303 and Al60. According to the results of this study, approximation surface roughness formulas which was deduced from the correlation of between the standard surface roughness and the sensing output were verified that they were effect against the surface roughness measurement value of the option sample. And handy optical fiber surface roughness measurement device which was produced by an order was verified that it was effect for measuring of the precision surface roughness.

본 연구는 광섬유센서를 이용하여 표면조도의 간이 비접촉 측정기를 개발하는데 목적이 있다. 광섬유 센서의 장점은 우수한 고속 응답성, 자기의 무영향, 제작의 편이성이다. 광섬유센서 표면조도 측정 원리는 측정물의 표면조도에 따라 반사되는 광의 세기와 기지의 표면조도 값을 일대일 대응시키는 것이다. 반사광의 세기는 센서 프로브로부터 표면까지의 거리와 표면조도에 따른 반사한계각에 따라 결정되는데 본 연구에서는 표면까지의 거리를 일정하게 하여 표면조도에 따른 반사한계각만을 가지고 표면조도가 결정되도록 측정 프로브를 제작하였다. 측정 시스템은 발광부, 수광부과 신호처리부로 구성되었다. 이 실험에서 사용된 표준 측정 재료는 SM45C, STS303과 Al60이었다. 연구결과 첫째, 재료에 따른 표면조도와 센서출력의 상관관계로부터 근사표면조도식을 도출하고 임의 가공된 시료의 표면조도 측정을 통해 근사표면조도식이 유효함을 입증하였다. 둘째, 실제 제작한 간이 광섬유센서 표면조도 측정기가 유용함을 입증하였다.

Keywords

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