TJXW–3D型便携式岩石三维表面形貌仪采用立体视觉法、结构光法和双目成像原理,对被测岩石的表面进行面测量。该形貌仪主要由2个高精度的工业摄像头、2个工业镜头、数字光栅投影装置、云台、三角架和用于数据采集的计算机组成。摄像头的分辨率为1.44×10^6 pixel,一次测量的最大面积可以人工调节,范围为200 mm×150 mm~400 mm×300 mm,最高测量精度为0.02 mm;测量时间短,一次测量仅需10 s;仪器仅重10 kg,可以拆开装入2个0.4 m×0.3m×0.2 m的盒子里,方便携带至现场。仪器所配套的测量与分析软件,可以对岩石表面的三维形貌进行图形显示与分析。与其他同类设备相比,具有以下显著特点:(1)每次对一个面上的数据进行测量,既节约了时间,又避免了多次测量产生的误差;(2)对于岩石表面形貌的测量而言,精度高,可以很好地反映出岩石表面的细节;(3)一次测量的最大有效面积可以调节,超出最大测量面积的被测表面,可以通过分块测量,并利用设置特征点将多次测量结果拼接的方法实现;(4)便于携带,可以在现场使用。该形貌仪的成功研制为岩石表面形貌学、节理面力学性质和渗流特性等的有关理论和应用研究提供了重要的技术装备。
A new three-dimensional TJXW–3D-typed portable rock surface topography system is developed for rock surface measurement,which is based on the method of stereo vision,structured light and binocular fringe projection.The apparatus consists of a couple of CCD industrial cameras with 1.44×10^6 pixel resolution,a couple of industrial lenses,a digital fringe projection device,a pan-tilt-zoom,a tripod and a computer for data collection.The maximum effective measuring area can be adjusted by operation,from 200 mm×150 mm to 400 mm×300 mm,of which the value of precision is as high as 0.02 mm.It only takes 10 seconds for each measuring.The apparatus weighs 10 kg,which can be carried easily after being disassembled and enclosed in two boxes with a volume of 0.4 m×0.3 m×0.2 m.The corresponding software,which controls the measurement and records the data automatically,maintains a function of parameter analyzing and graph displaying on 3D surface topography of rock joints.Compared with traditional measurement techniques,obvious advantages of this apparatus are as follows.(1) A whole surface can be measured at a time,which not only saves working time,but also avoids repeated errors by multi-measurement.(2) The apparatus has a high precision for measuring rock surface topography that enables the results to describe the detail of rock surface accurately.(3) The maximum effective measuring area can be adjusted.Furthermore,if the surface being measured is larger than the maximum effective measuring area,surface topography parameter can be obtained by multiple subdivided measurements:Firstly the large surface is divided into several small areas,then each small one is measured,at last,the data clouds of the small ones constitute the large surface by the technique of marked point automatic identifying and point cloud automatic registering.(4) It′s convenient to carry,which enables its usage both in laboratory and in field.The development of this apparatus and its application is of great significance not only