Interferometric 2D small angle generator for autocollimator calibration

Ville Heikkinen (Corresponding Author), Ville Byman, Ilkka Palosuo, Björn Hemming, Antti Lassila

    Research output: Contribution to journalArticleScientificpeer-review

    23 Citations (Scopus)


    Small angle generators are simple devices for providing small angles traceable to the definition of the SI-unit radian. The most accurate ones use a laser interferometer for measurement of angular displacement. Small angle generators used for autocollimator calibration usually create angles around a single axis. A two-directional angle generator would be preferable, as it could more efficiently reveal artefacts related to angular displacement across both axes, such as orthogonality of the autocollimator's measuring axes. Characterizing errors depending on one axis only would also be easier, as the setup needs to be aligned only once for studying both axes of the autocollimator. We describe a novel interferometric two-directional small angle generator which we have built and tested for autocollimator calibration. The range is ±1000'' for both axes. The estimated standard uncertainty for full range is 0.0036'' for the horizontal and 0.0053'' for the vertical direction.
    Original languageEnglish
    Pages (from-to)253-261
    Issue number3
    Publication statusPublished - 2017
    MoE publication typeA1 Journal article-refereed


    • angle measurement
    • autocollimator
    • interferometry
    • metrology


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