Temperature effects in triangulation range measurements

Edward Shen; Anthony Paul Badali; Winnifred Wong; Richard I. Hornsey; Paul J. Thomas; Mayes Mullins

doi:10.1117/12.567691

9 December 2004 Temperature effects in triangulation range measurements

Edward Shen, Anthony Paul Badali, Winnifred Wong, Richard I. Hornsey, Paul J. Thomas, Mayes Mullins

Proceedings Volume 5578, Photonics North 2004: Photonic Applications in Astronomy, Biomedicine, Imaging, Materials Processing, and Education; (2004) https://doi.org/10.1117/12.567691
Event: Photonics North, 2004, Ottawa, Ontario, Canada

Abstract

An optical beam combined with an array detector in a suitable geometrical arrangement is well-known to provide a range measurement based on the image position. Such a 'triangulation' rangefinder can measure range with short-term repeatability below the 10^-5 level, with the aid of spatial and temporal image processing. This level of precision is achieved by a centroid measurement precision of ±0.02 pixel. In order to quantify its precision, accuracy and linearity, a prototype triangulation rangefinder was constructed and evaluated in the laboratory using a CMOS imager and a collimated optical source. Various instrument, target and environmental conditions were used. The range-determination performance of the prototype instrument is described, based on laboratory measurements and augmented by a comprehensive parametric model. Temperature drift was the dominant source of systematic error. The temperature and vibration environments and target orientation and motion were controlled to allow their contributions to be independently assessed. Laser, detector and other effects were determined both experimentally and through modeling. Implementation concepts are presented for a custom CMOS imager that can enhance the performance of the rangefinder, especially with regards to update rate.

Citation Download Citation

Edward Shen, Anthony Paul Badali, Winnifred Wong, Richard I. Hornsey, Paul J. Thomas, and Mayes Mullins "Temperature effects in triangulation range measurements", Proc. SPIE 5578, Photonics North 2004: Photonic Applications in Astronomy, Biomedicine, Imaging, Materials Processing, and Education, (9 December 2004); https://doi.org/10.1117/12.567691

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