公开(公告)号：US20160139062A1

公开(公告)日：2016-05-19

申请号：US14899840

申请日：2013-06-25

Applicant: PRYSMIAN S.P.A.

Inventor： Antonio Faraldi ,  Gerardo Testa ,  Antonio Adigrat ,  Franco Cocchini

IPC: G01N21/954 ,  C03B37/025 ,  G01M11/08

CPC classification number: G01N21/954 ,  C03B37/025 ,  G01M11/088 ,  G01M11/37 ,  G01N2021/9548 ,  G01N2201/06113 ,  G01N2201/105

Abstract: A method for inspecting defects inside a rod-shaped transparent object by using a scanning beam of parallel light rays directed onto a rod-shaped transparent object orthogonally to the longitudinal axis of the object so that an inspection plane comprises an object's cross-section. The scanning beam is detected at an opposite side of the rod-shaped object that is interposed to intercept the parallel rays of the scanning beam. The electric output signal from the detector is processed to produce a first light intensity profile in a first scan direction, the light intensity profile comprising a shadow region delimited by first and second shadow edges, which is indicative of the outside diameter of the object across the inspection plane. The method comprises analysing the first light intensity profile to determine the presence or absence of a peak of positive intensity within the shadow region and, if an intensity peak is determined to be present, to determine the presence or absence of a region of depressed intensity within the intensity peak. If, as a result of analysing, an intensity peak within the shadow region is determined to be absent or a region of depressed intensity is determined to be present within the intensity peak, the presence of at least one structural defect within the object's cross-section is identified. In the preferred embodiments, the rod-shaped transparent object is a glass core rod for the production of a transmission optical fibre.

Abstract translation: 一种用于通过使用与物体的纵向轴线正交的杆状透明物体上的平行光线的扫描光束来检查棒状透明物体内的缺陷的方法，使得检查平面包括物体的横截面。 扫描光束在被插入以截取扫描光束的平行光线的棒状物体的相反侧被检测。 来自检测器的电输出信号被处理以在第一扫描方向上产生第一光强度分布，光强度分布包括由第一和第二阴影边界限定的阴影区域，该阴影区域指示物体的外直径 检查机。 该方法包括分析第一光强分布以确定阴影区域内正强度峰值的存在或不存在，以及如果确定强度峰值存在，则确定强度峰值存在或不存在 强度峰值。 如果作为分析的结果，确定阴影区域内的强度峰值被确定为不存在，或者确定强度峰值区域存在于强度峰值内，则在物体的横截面内存在至少一个结构缺陷 被识别。 在优选实施例中，棒状透明物体是用于制造透射光纤的玻璃芯棒。

公开(公告)号：US09939390B2

公开(公告)日：2018-04-10

申请号：US14899840

申请日：2013-06-25

Applicant: Prysmian S.p.A.

Inventor： Antonio Faraldi ,  Gerardo Testa ,  Antonio Adigrat ,  Franco Cocchini

IPC: C03B37/025 ,  G01N21/954 ,  G01M11/00 ,  G01M11/08

CPC classification number: G01N21/954 ,  C03B37/025 ,  G01M11/088 ,  G01M11/37 ,  G01N2021/9548 ,  G01N2201/06113 ,  G01N2201/105

Abstract: A method for inspecting defects inside a rod-shaped transparent object by using a scanning beam of parallel light rays directed onto a rod-shaped transparent object orthogonally to the longitudinal axis of the object so that an inspection plane comprises an object's cross-section. The scanning beam is detected at an opposite side of the rod-shaped object that is interposed to intercept the parallel rays of the scanning beam. The electric output signal from the detector is processed to produce a first light intensity profile in a first scan direction, the light intensity profile comprising a shadow region delimited by first and second shadow edges, which is indicative of the outside diameter of the object across the inspection plane. The method comprises analyzing the first light intensity profile to determine the presence or absence of a peak of positive intensity within the shadow region and, if an intensity peak is determined to be present, to determine the presence or absence of a region of depressed intensity within the intensity peak. If, as a result of analyzing, an intensity peak within the shadow region is determined to be absent or a region of depressed intensity is determined to be present within the intensity peak, the presence of at least one structural defect within the object's cross-section is identified. In the preferred embodiments, the rod-shaped transparent object is a glass core rod for the production of a transmission optical fiber.