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材料表面的散射特性和表面粗糙度对产品的性能有十分重要的影响,基于激光散射原理设计了用于检测表面粗糙度和表面散射特性的多波长光纤传感器。光纤传感器的探头采用特殊的几何设计,用650 nm、1 310 nm和1 550 nm激光作为光源,选择2 mm的工作距离作为最佳测量距离,对不同表面粗糙度的样品进行了测试和分析。实验结果表明:同一波长下,随着表面粗糙度的增大,以外磨样品为反射面测得的反射强度减小;同一粗糙度下,入射波长越长,反射强度越大。多波长光纤传感器可以精确地测量表面粗糙度,并能有效地减小系统误差。系统误差分析得到传感器的相对误差范围大约为3.56%~7.43%。
Scattering properties and surface roughness of the material surface have a very important effect on the performance of the product. Based on the principle of laser scattering, a multi-wavelength optical fiber sensor for detecting the surface roughness and surface scattering characteristics is designed. The fiber optic sensor’s probe uses a special geometric design, with 650 nm, 1 310 nm and 1 550 nm laser as the light source, select the working distance of 2 mm as the best measuring distance, the samples with different surface roughness were tested and analyzed. The experimental results show that with the increase of surface roughness, the reflection intensity decreases with the increase of the surface roughness at the same wavelength, and the reflection intensity increases with the incident wavelength at the same roughness. Multi-wavelength fiber optic sensors accurately measure surface roughness and effectively reduce systematic errors. The systematic error analysis obtains the relative error range of the sensor about 3.56% ~ 7.43%.