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Publication Details
| Published Date: | |
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| Authors: | S.Robson, B.Sargeant, R. Smith, S. Kyle and M. Shortis |
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Abstract
Low-cost camera systems based on off-the-shelf imaging components are seeing increasingly widespread use for metrology orientated research purposes such as robotics, part alignment and inspection. This presentation describes a system under continuing development at University College London. It gives first results from laboratory testing of a constellation of four synchronised off-the-shelf cameras connected to a $1000 computer to image at 100Hz. This constellation has the goal of achieving on-line sub-mm measurement of multiple, rapidly moving and deforming test objects.
The exploratory test setup comprises four 3MP USB3.0 cameras interfaced independently at 5Gbs to a multiport USB3.1 card for processing on an i7 intel processor. Cameras are synchronised together with a custom synchronisation box based on an LED lighting controller sending a timing trigger pulse in parallel to all cameras. Illumination is based on low-cost $10 green LED ring lights mounted using 3D prints to the front of each camera lens. The system is used to observe two $20 USB-powered 4” desk fans which independently rotate in the field of view of the cameras. Blocks of coded targets are located at a 2” radius on the fan blades. When rotating at around 2700rpm these deliver a convenient velocity of 13ms-1 with each fan running unsynchronised and independently.
