科研之友
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摘要
In order to overcome the difficulty of online measurement of the large hot cylindrical forgings at very high temperature, a method combining the mobile devices with the binocular vision system is proposed in this paper. Firstly, the traditional binocular vision system is optimized, including using the line green laser to mark clear stripes on forgings, using high-resolution cameras to get these stripes, setting a 500 nm filter on each camera for eliminating the thermal radiation's influence and obtaining the forgings'outlines synchronously at the same time, and placing the whole system on the rails installed on a removable manual truck to expand the binocular vision system's measurement range. Meanwhile another point green laser is designed to get marking points in order to connect the measurement areas. And an electronic total station is used to track the left camera's position to simplify the coordinate transformation. Then, the formula for 3D data reconstruction of binocular vision system is corrected to adapt to the actual conditions. The results show the error is under 1‰when a Φ2×10 m forging is measured in this way. This method is fast and accurate, which can provide references for hot-state measurement of large forgings.
