Gibson, Sam J.Charrett, Thomas O. H.Tatum, Ralph P.2024-07-152024-07-152024-06-28Gibson SJ, Charrett TOH, Tatam RP. (2024) Towards High Resolution Absolute Angle Sensing using Dual-Wavelength Laser Speckle. In: 2024 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 20-23 May 2023, Glasgow, UK979-8-3503-8091-02642-2069https://doi.org/10.1109/I2MTC60896.2024.10561063https://dspace.lib.cranfield.ac.uk/handle/1826/22638We present a two dimensional angle sensor with greater than 0.01 degrees resolution, using dual-wavelength laser speckle. The technique uses speckle correlation of a double speckle pattern, determining absolute surface tilt from a single frame. A constructed sensor was used to measure a grid of 2D angles between ±0.25° rotating around both x and y axes. Sensor performance was limited by laser mode instability effects, however an analysis of measurements demonstrated that a stable mode output could achieve bias errors of less than 0.010°, and standard deviations of 0.003° around x and 0.021° around y .enAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/Surface wavesWavelength measurementMeasurement by laser beamSurface emitting lasersSpeckleLaser stabilityRobot sensing systemsConference paper979-8-3503-8090-32642-207710.1109/I2MTC60896.2024.10561063