Kissinger, ThomasCharrett, Thomas O. H.James, Stephen W.Tatam, Ralph P.2017-06-072017-06-072015-09-03Thomas Kissinger, Thomas O. H. Charrett, Stephen W. James and Ralph P. Tatam. Cost-effective vibration and displacement measurement using range-resolved interferometry. Proceedings of the BSSM 10th international conference on advances in experimental mechanics, 1-3rd September 2015, Edinburgh, UKhttp://www.bssm.org/2015papershttp://www.bssm.org/uploadeddocuments/Conference%202015/2015papers/Cost-effective_vibration_and_displacement_measurement_using_rangeresolved.pdfhttps://dspace.lib.cranfield.ac.uk/handle/1826/11980©2015. British Society for Strain Measurement’s (BSSM). Please refer to any applicable publisher terms of use.A recently developed range-resolved optical interferometric signal processing technique is applied to vibration and displacement sensing with fibre-based beam delivery. The technique is demonstrated to allow the simultaneous acquisition of high-quality, high resolution relative displacement measurements (ߪ ൌ ͵ ) based on interferometric phase evaluation along with coarser ሺߪ ൌ ͲǤͲͷ ) absolute displacement measurements. The interferometric relative displacement data can be used for vibrometry measurement and to yield high-quality derivative velocity and acceleration data suitable for position control applications. The absolute data can serve as an additional proximity sensor. The sensing approach employs cost-effective diode lasers, off-the-shelf digital processing hardware and a very simple optical setup, and can, due to the use of a collimated beam, operate over a wide range of working distances.enArticle