Automated Scan Plane Alignment for Robot-Based Planar Near-Field Antenna Measurements

Authors: R. Moch, Q. Ton, P. Pelland
Publication: AMTA 2025
Copyright Owner: NSI-MI Technologies

An automated scan plane alignment technique for robot-based planar near-field antenna measurements enables precise and efficient calibration of unknown and arbitrarily oriented antennas under test (AUTs). By integrating a highresolution laser line profile sensor with a robotic arm, the system dynamically determines the AUT’s position, orientation, and outline without requiring detailed prior knowledge. A realtime feedback loop guides the robot to adaptively align the scan plane based on measured surface profiles, taking into account tilts or non-ideal AUT placements. Edge detection and reference mark identification further enhance accuracy, allowing to precisely align the scan center with the AUT’s geometric center. The method is validated using a reference metal plate and is particularly suited for spatially flat antennas or radomes. Beyond alignment, the same setup enables high-resolution optical inspection, capable of detecting fine surface details such as cracks, dents, or even the thickness of ink from printing. The approach significantly reduces setup time by eliminating manual alignment steps, and broadens the functionality of robot-based measurement systems by combining self-alignment and optical inspection into a single automated process.

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