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                                                                                                                                                              您的位置>首頁>新聞動態> 陜西永輝帶你了解產品表面缺陷檢測系統

                                                                                                                                                              發布時間: 2022-07-13    瀏覽量:24
                                                                                                                                                              機器視覺

                                                                                                                                                                與前幾年相比,機器視覺行業在表面檢測方面有了很大的突破。檢測產品表面的劃痕、污漬不再困難,廣泛應用于金屬、玻璃、手機屏幕、液晶面板等行業的表面檢測。

                                                                                                                                                                機器視覺檢測有以下四種常用的檢查和照明方法:

                                                                                                                                                                同軸照明、低角度照明、背光照明和高角度照明對硬劃痕檢測效果明顯,但對表面要求較高的產品,如軟劃痕,效果不太明顯。

                                                                                                                                                                根據大數據分析,針對產品表面劃痕主要提出低角度和高角度兩種解決方案。

                                                                                                                                                              康耐視視覺檢測相機


                                                                                                                                                                1.低角度模式

                                                                                                                                                                產品劃痕檢測,表面視覺檢測系統-機器視覺_視覺檢測設備_3D視覺_缺陷檢測

                                                                                                                                                                兩個物體接觸摩擦時,容易刮傷表面,也就是說刮傷是有方向性的。

                                                                                                                                                                在考慮低角度光照效果時,如果我們使用平行光(平行于劃痕),劃痕會被光線模糊,在圖像中效果不明顯。

                                                                                                                                                                如果我們使用一組垂直于光線的照射(垂直于劃痕),劃痕會被光線突出,在圖像中效果非常明顯。

                                                                                                                                                                由以上分析,我們采用八個條形光源對工件進行及時曝光,并設計了以下照明方案。

                                                                                                                                                                一個環形光源,分八路控制,分時曝光,連續采集八次。軟件采用算法,疊加所有缺陷,高標準檢測工件表面是否有劃痕。

                                                                                                                                                                二、高角度方式

                                                                                                                                                                根據我們的經驗,在同軸光效應下,光源的工作距離越高,效果越明顯。

                                                                                                                                                                但是,對于同一個光源,在機器視覺光源工作距離高的同時,光源的發光面越小,光源的亮度越低,效果與實際情況不能有兩面性。

                                                                                                                                                                很多時候,我們生產線員工目測產品表面信息時,都是用日光燈照明,日光燈是通過鏡面反射入射到眼睛上的。

                                                                                                                                                                根據光的反射定律,利用鏡面反射對工件進行拋光,形成鏡面反射效果。仔細觀察的人會發現,肉眼檢查法往往是讓日光燈投射到產品內部,然后通過擺動產品讓日光燈的影子在產品內部移動。

                                                                                                                                                                這樣光斑就照亮了產品的部分,從而反映出產品表面的信息,使人眼可以清楚地判斷產品是否存在缺陷,微弱的缺陷也容易被看到。

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