ANDREW BROOKES, NATIONAL PHYSICAL LABORATORY / SCIENCE PHOTO LIBRARY ANDREW BROOKES, NATIONAL PHYSICAL LABORATORY / SCIENCE PHOTO LIBRARY
Two-dimensional calibrating standard. Physicist holding an X-Y (two-dimensional) optical position standard. The X-Y standard is made from glass or quartz and has a reflective chromium-coated pattern of many crosshairs spanning its surface. These crosshairs are designed to calibrate measuring machines that use a viewing system to locate features. Such machines are used in the automated optical inspection (AOI) of circuit boards, where a camera autonomously scans the boards for faults such as missing components. Photographed at the National Physical Laboratory in Teddington, UK.
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