Rotary Laser Research Articles

Design analysis and applications of a 3D laser ball bar for accuracy calibration of multiaxis machines

Conventional techniques for measuring the volumetric errors of Cartesian coordinate machine tools are time consuming using a laser interferometer or step gauges. For multiaxis machines, where the spindle can swing, volumetric error calibration is even more difficult. In this study, a novel 3D laser ball bar (3D-LBB) has been developed for the easy setup and rapid measurement of the tool position relative to the worktable at any working point of multiaxis machines. The instrument makes use of one laser ball bar and two rotary laser encoders to detect the target path in the spherical coordinate system. The design of the instrument is discussed, and the error attributes are analyzed to enhance the instrument's accuracy. Applications to the volumetric error measurement of a robot and two types of machine tools have demonstrated the high-precision capability of this 3D laser ball bar.

Three-dimensional Technology for Apparel Mass Customization: Part I: Body Scanning with Rotary Laser Stripes

Three-dimensional scanning and modeling technology has been successfully used to solve apparel sizing and fit problems. The new technology not only assists consumers to find good-fit clothes with individual body information, but also enables apparel manufacturers to deliver customized products with personal fit preferences. In tis series of papers, we report the recent work in developing an integrated system that performs body scanning, body modeling, e-tape measurement, and virtual try-on. Tbe present paper focuses on the introduction of a rotary body scanner using structural laser stripes. The new scanner aims at improving its practicality to meet tbe speed, cost, portability and other requirements in operation.

Current techniques for infrainguinal arterial reconstruction

Infrainguinal reconstruction for peripheral vascular occlusive disease comprises an increasingly complex array of interventions which provide unparalleled options for the salvage of threatened limbs. Conventional autogenous saphenous vein bypass remains the most durable revascularization with anticipated graft patency rates approaching 80 percent after five years and excellent long term limb salvage. These excellent results are equally applicable to vein grafts carried to infrapopliteal and even inframalleolar levels, possibly reflecting increased utilization of the in situ method. Although 20 per cent of grafts fail within five years, secondary intervention results in sustained limb salvage in the majority of patients. In the absence of autogenous vein, however, prosthetic material performs poorly such that new interventions consisting of percutaneous transluminal angioplasty, rotary atherectomy devices and laser systems are under aggressive development. Although initial results with these devices are encouraging, long term patency rates remain poor largely due to restenosis. Further progress seems to depend primarily on an increased understanding of the natural healing response of the injured artery.